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data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Selektiv_IgA_defisiti" title="Selektiv IgA defisiti – Azerbaijani" lang="az" hreflang="az" data-title="Selektiv IgA defisiti" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Selektiver_Immunglobulin-A-Mangel" title="Selektiver Immunglobulin-A-Mangel – German" lang="de" hreflang="de" data-title="Selektiver Immunglobulin-A-Mangel" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Deficiencia_selectiva_de_inmunoglobulina_A" title="Deficiencia selectiva de inmunoglobulina A – Spanish" lang="es" hreflang="es" data-title="Deficiencia selectiva de inmunoglobulina A" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D9%85%D8%A8%D9%88%D8%AF_%D9%BE%D8%A7%D8%AF%D8%AA%D9%86_%D8%A2" title="کمبود پادتن آ – Persian" lang="fa" hreflang="fa" data-title="کمبود پادتن آ" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Deficit_di_IgA" title="Deficit di IgA – Italian" lang="it" hreflang="it" data-title="Deficit di IgA" data-language-autonym="Italiano" data-language-local-name="Italian" 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data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"SIgAD" redirects here. For the signals intelligence activity, see <a href="/wiki/SIGAD" class="mw-redirect" title="SIGAD">SIGAD</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Medical condition</div><style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox ib-medical-condition"><tbody><tr><th colspan="2" class="infobox-above" style="background:#ccc">Selective immunoglobulin A deficiency</th></tr><tr style="background-color: #f8f9fa;"><td colspan="2" class="infobox-full-data"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:Immunglobulin_A_as_Dimer.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Immunglobulin_A_as_Dimer.png/220px-Immunglobulin_A_as_Dimer.png" decoding="async" width="220" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Immunglobulin_A_as_Dimer.png/330px-Immunglobulin_A_as_Dimer.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/Immunglobulin_A_as_Dimer.png/440px-Immunglobulin_A_as_Dimer.png 2x" data-file-width="500" data-file-height="500" /></a></span></td></tr><tr><td colspan="2" class="infobox-full-data">The dimeric IgA molecule. 1 H-chain, 2 L-chain, 3 J-chain, 4 secretory component</td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/Medical_specialty" title="Medical specialty">Specialty</a></th><td class="infobox-data"><a href="/wiki/Immunology" title="Immunology">Immunology</a> <span class="penicon autoconfirmed-show"><span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q942926?uselang=en#P1995" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></td></tr></tbody></table> <p><b>Selective immunoglobulin A (IgA) deficiency</b> (<b>SIgAD</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>) is a kind of <a href="/wiki/Immunodeficiency" title="Immunodeficiency">immunodeficiency</a>, a type of <a href="/wiki/Hypogammaglobulinemia" title="Hypogammaglobulinemia">hypogammaglobulinemia</a>. People with this deficiency lack <a href="/wiki/Immunoglobulin_A" title="Immunoglobulin A">immunoglobulin A</a> (IgA), a type of <a href="/wiki/Antibody" title="Antibody">antibody</a> that protects against infections of the mucous membranes lining the mouth, airways, and digestive tract. It is defined as an undetectable serum IgA level in the presence of normal serum levels of <a href="/wiki/IgG" class="mw-redirect" title="IgG">IgG</a> and <a href="/wiki/IgM" class="mw-redirect" title="IgM">IgM</a>, in persons older than 4 years. It is the most common of the primary antibody deficiencies. Most such persons remain healthy throughout their lives and are never diagnosed. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Signs_and_symptoms">Signs and symptoms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=1" title="Edit section: Signs and symptoms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>85–90% of IgA-deficient individuals are asymptomatic, although the reason for lack of symptoms is relatively unknown and continues to be a topic of interest and controversy.<sup id="cite_ref-Yel,_L._2010_pp._10-16_2-0" class="reference"><a href="#cite_note-Yel,_L._2010_pp._10-16-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Some patients with IgA deficiency have a tendency to develop recurrent sinopulmonary infections, gastrointestinal infections and disorders, allergies, autoimmune conditions, and malignancies.<sup id="cite_ref-Yel,_L._2010_pp._10-16_2-1" class="reference"><a href="#cite_note-Yel,_L._2010_pp._10-16-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> These infections are generally mild and would not usually lead to an in-depth workup except when unusually frequent. They rarely present with severe reactions, including <a href="/wiki/Anaphylaxis" title="Anaphylaxis">anaphylaxis</a>, to <a href="/wiki/Blood_transfusions" class="mw-redirect" title="Blood transfusions">blood transfusions</a> or <a href="/wiki/Intravenous_immunoglobulin" class="mw-redirect" title="Intravenous immunoglobulin">intravenous immunoglobulin</a> due to the presence of IgA in these blood products. Patients have an increased susceptibility to <a href="/wiki/Pneumonia" title="Pneumonia">pneumonia</a> and recurrent episodes of other <a href="/wiki/Respiratory_tract_infection" title="Respiratory tract infection">respiratory infections</a> and a higher risk of developing <a href="/wiki/Autoimmune_disease" title="Autoimmune disease">autoimmune diseases</a> in middle age.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p><p>IgA deficiency and <a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">common variable immunodeficiency</a> (CVID) feature similar <a href="/wiki/B_cell" title="B cell">B cell</a> <a href="/wiki/Cellular_differentiation" title="Cellular differentiation">differentiation</a> arrests,<sup id="cite_ref-:0_4-0" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> but it does not present the same <a href="/wiki/Lymphocyte" title="Lymphocyte">lymphocyte</a> subpopulation abnormalities.<sup id="cite_ref-pmid17223965_5-0" class="reference"><a href="#cite_note-pmid17223965-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> IgA-deficient patients may progress to <a href="/w/index.php?title=Panhypogammaglobulinemia&action=edit&redlink=1" class="new" title="Panhypogammaglobulinemia (page does not exist)">panhypogammaglobulinemia</a> characteristic of <a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">CVID</a>.<sup id="cite_ref-:0_4-1" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Selective IgA and <a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">CVID</a> are found in the same family.<sup id="cite_ref-:0_4-2" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Cause">Cause</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=2" title="Edit section: Cause"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Selective IgA deficiency is inherited in less than half of cases,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> but has been associated with differences in <a href="/wiki/Chromosome" title="Chromosome">chromosomes</a> <a href="/wiki/Chromosome_18" title="Chromosome 18">18</a>, <a href="/wiki/Chromosome_14" title="Chromosome 14">14</a> and <a href="/wiki/Chromosome_6" title="Chromosome 6">6</a>. Selective IgA deficiency is often inherited, but fewer than half of all cases but has been associated with some <a href="/wiki/Neonatal_infection" title="Neonatal infection">congenital intrauterine infections</a>.<sup id="cite_ref-:0_4-3" class="reference"><a href="#cite_note-:0-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Pathophysiology">Pathophysiology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=3" title="Edit section: Pathophysiology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><b>Pathogenesis of IgA Deficiency</b> </p><p>‘In IgA-deficient patients, the common finding is a maturation defect in B cells to produce IgA’. ‘In IgA deficiency, B cells express IgA; however, they are of immature <a href="/wiki/Phenotype" title="Phenotype">phenotype</a> with the coexpression of IgM and IgD, and they cannot fully develop into IgA-secreting plasma cells’. <sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>There is an inherited inability to produce <a href="/wiki/Immunoglobulin#IgA" class="mw-redirect" title="Immunoglobulin">immunoglobulin A (IgA)</a>, a part of the body's defenses against infection at the body's surfaces (mainly the surfaces of the respiratory and digestive systems). As a result, bacteria at these locations are somewhat more able to cause disease.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2021)">citation needed</span></a></i>]</sup> </p><p>Types include: </p> <table class="wikitable"> <tbody><tr> <th>Type </th> <th><a href="/wiki/OMIM" class="mw-redirect" title="OMIM">OMIM</a> </th> <th>Gene </th> <th>Locus </th></tr> <tr> <td>IGAD1 </td> <td><a rel="nofollow" class="external text" href="https://omim.org/entry/137100">137100</a> </td> <td>Unknown; <a href="/wiki/MSH5" title="MSH5">MSH5</a> suggested<sup id="cite_ref-pmid17409188_8-0" class="reference"><a href="#cite_note-pmid17409188-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </td> <td>6p21 </td></tr> <tr> <td>IGAD2 </td> <td><a rel="nofollow" class="external text" href="https://omim.org/entry/609529">609529</a> </td> <td><i><a href="/wiki/TNFRSF13B" class="mw-redirect" title="TNFRSF13B">TNFRSF13B</a></i> </td> <td>17p11 </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="Diagnosis">Diagnosis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=4" title="Edit section: Diagnosis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When suspected, the diagnosis can be confirmed by laboratory measurement of IgA level in the blood. SIgAD is an IgA level < 7 mg/dL with normal IgG and IgM levels (reference range 70–400 mg/dL for adults; children somewhat less).<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Treatment">Treatment</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=5" title="Edit section: Treatment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The treatment consists of identification of co-morbid conditions, preventive measures to reduce the risk of infection, and prompt and effective treatment of infections. Infections in an IgA-deficient person are treated as usual (i.e., with antibiotics). There is no treatment for the underlying disorder.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> All SIgAD patients, even if asymptomatic, should receive pneumococcal and influenza vaccines, but should avoid live attenuated vaccines.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Use_of_IVIG_as_treatment">Use of IVIG as treatment</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=6" title="Edit section: Use of IVIG as treatment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There is a historical popularity in using <a href="/wiki/Intravenous_immunoglobulin" class="mw-redirect" title="Intravenous immunoglobulin">intravenous immunoglobulin</a> (IVIG) to treat SIgAD, but the consensus is that there is no evidence that IVIG treats this condition.<sup id="cite_ref-AAAAIfive_13-0" class="reference"><a href="#cite_note-AAAAIfive-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Bonilla_14-0" class="reference"><a href="#cite_note-Bonilla-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_15-0" class="reference"><a href="#cite_note-:1-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> In cases where a patient presents SIgAD and another condition which is treatable with IVIG, then a physician may treat the other condition with IVIG.<sup id="cite_ref-Bonilla_14-1" class="reference"><a href="#cite_note-Bonilla-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> The use of IVIG to treat SIgAD without first demonstrating an impairment of specific antibody formation is not recommended.<sup id="cite_ref-Bonilla_14-2" class="reference"><a href="#cite_note-Bonilla-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-cite_PMID|10792368_16-0" class="reference"><a href="#cite_note-cite_PMID|10792368-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-immunoglobulintherapy_17-0" class="reference"><a href="#cite_note-immunoglobulintherapy-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_15-1" class="reference"><a href="#cite_note-:1-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-AAAAIfive_13-1" class="reference"><a href="#cite_note-AAAAIfive-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Prognosis">Prognosis</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=7" title="Edit section: Prognosis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Prognosis is excellent, although there is an association with <a href="/wiki/Autoimmune_disease" title="Autoimmune disease">autoimmune disease</a>. Of note, selective IgA deficiency can complicate the diagnosis of one such condition, <a href="/wiki/Celiac_disease" class="mw-redirect" title="Celiac disease">celiac disease</a>, as the deficiency masks the <a href="/wiki/Celiac_disease#Blood_tests" class="mw-redirect" title="Celiac disease">high levels of certain IgA antibodies</a> usually seen in celiac disease.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p><p>As opposed to the related condition <a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">CVID</a>, selective IgA deficiency is not associated with an increased risk of <a href="/wiki/Cancer" title="Cancer">cancer</a>.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>Patients with Selective IgA deficiency rarely have severe reactions to blood transfusions.<sup id="cite_ref-:2_20-0" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> Although Selective IgA deficiency is common,<sup id="cite_ref-titleIgA_Deficiency:_Immunodeficiency_Disorders:_Merck_Manual_Professional_21-0" class="reference"><a href="#cite_note-titleIgA_Deficiency:_Immunodeficiency_Disorders:_Merck_Manual_Professional-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:3_22-0" class="reference"><a href="#cite_note-:3-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> severe reactions to blood transfusions are very rare.<sup id="cite_ref-:2_20-1" class="reference"><a href="#cite_note-:2-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:3_22-1" class="reference"><a href="#cite_note-:3-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> People with selective IgA deficiency do not require special blood products unless they have a history of a severe allergic reaction to a blood transfusion.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Epidemiology">Epidemiology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=8" title="Edit section: Epidemiology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Prevalence varies by population, but is on the order of 1 in 100 to 1 in 1000 people,<sup id="cite_ref-titleIgA_Deficiency:_Immunodeficiency_Disorders:_Merck_Manual_Professional_21-1" class="reference"><a href="#cite_note-titleIgA_Deficiency:_Immunodeficiency_Disorders:_Merck_Manual_Professional-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> making it relatively common. SIgAD occurs in 1 in 39 to 1 in 57 people with celiac disease. This is much higher than the prevalence of selective IgA deficiency in the general population.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> It is also significantly more common in those with type 1 <a href="/wiki/Diabetes" title="Diabetes">diabetes</a>.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2021)">citation needed</span></a></i>]</sup> </p><p>It is more common in males than in females.<sup id="cite_ref-pmid15025682_29-0" class="reference"><a href="#cite_note-pmid15025682-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=9" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/B_cell_deficiency" class="mw-redirect" title="B cell deficiency">B cell deficiency</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selective_immunoglobulin_A_deficiency&action=edit&section=10" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription 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style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;background: #EAECF0;color:black;">Classification</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><div style="position:relative; float:right; font-size:0.8em;"><a href="https://www.wikidata.org/wiki/Q942926" class="extiw" title="d:Q942926">D</a></div><div class="hlist" style="text-align:left;"><ul><li><b><a href="/wiki/International_Statistical_Classification_of_Diseases_and_Related_Health_Problems" class="mw-redirect" title="International Statistical Classification of Diseases and Related Health Problems">ICD</a>-<a href="/wiki/ICD-10" title="ICD-10">10</a></b>: <a rel="nofollow" class="external text" href="https://icd.who.int/browse10/2019/en#/D80.2">D80.2</a></li><li><b><a href="/wiki/International_Statistical_Classification_of_Diseases_and_Related_Health_Problems" class="mw-redirect" title="International Statistical Classification of Diseases and Related Health Problems">ICD</a>-<a href="/wiki/List_of_ICD-9_codes" title="List of ICD-9 codes">9-CM</a></b>: <a rel="nofollow" class="external text" href="http://www.icd9data.com/getICD9Code.ashx?icd9=279.01">279.01</a></li><li><b><a href="/wiki/Online_Mendelian_Inheritance_in_Man" title="Online Mendelian Inheritance in Man">OMIM</a></b>: <a rel="nofollow" class="external text" href="https://omim.org/entry/137100">137100</a></li><li><b><a href="/wiki/Medical_Subject_Headings" title="Medical Subject Headings">MeSH</a></b>: <a rel="nofollow" class="external text" href="https://meshb.nlm.nih.gov/record/ui?ui=D017098">D017098</a></li><li><b><a href="/wiki/Diseases_Database" title="Diseases Database">DiseasesDB</a></b>: <a rel="nofollow" class="external text" href="http://www.diseasesdatabase.com/ddb29569.htm">29569</a></li></ul></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background: #EAECF0;color:black;">External resources</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="hlist" style="text-align:left;"><ul><li><b><a href="/wiki/MedlinePlus" title="MedlinePlus">MedlinePlus</a></b>: <a rel="nofollow" class="external text" href="https://www.nlm.nih.gov/medlineplus/ency/article/001476.htm">001476</a></li><li><b><a href="/wiki/EMedicine" title="EMedicine">eMedicine</a></b>: <a rel="nofollow" class="external text" href="https://emedicine.medscape.com/med/1159-overview">med/1159</a></li></ul></div></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Lymphoid_and_complement_disorders_causing_immunodeficiency" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Lymphoid_and_complement_immunodeficiency" title="Template:Lymphoid and complement immunodeficiency"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Lymphoid_and_complement_immunodeficiency" title="Template talk:Lymphoid and complement immunodeficiency"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Lymphoid_and_complement_immunodeficiency" title="Special:EditPage/Template:Lymphoid and complement immunodeficiency"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Lymphoid_and_complement_disorders_causing_immunodeficiency" style="font-size:114%;margin:0 4em"><a href="/wiki/Lymphatic_system" title="Lymphatic system">Lymphoid</a> and <a href="/wiki/Complement_system" title="Complement system">complement</a> disorders causing <a href="/wiki/Immunodeficiency" title="Immunodeficiency">immunodeficiency</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Primary_immunodeficiency" title="Primary immunodeficiency">Primary</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Antibody" title="Antibody">Antibody</a>/<a href="/wiki/Humoral_immune_deficiency" title="Humoral immune deficiency">humoral</a><br />(<a href="/wiki/B_cell" title="B cell">B</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Hypogammaglobulinemia" title="Hypogammaglobulinemia">Hypogammaglobulinemia</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/X-linked_agammaglobulinemia" title="X-linked agammaglobulinemia">X-linked agammaglobulinemia</a></li> <li><a href="/wiki/Transient_hypogammaglobulinemia_of_infancy" title="Transient hypogammaglobulinemia of infancy">Transient hypogammaglobulinemia of infancy</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Dysgammaglobulinemia" title="Dysgammaglobulinemia">Dysgammaglobulinemia</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">IgA deficiency</a></li> <li><a href="/wiki/IgG_deficiency" title="IgG deficiency">IgG deficiency</a></li> <li><a href="/wiki/Immunoglobulin_M_deficiency" class="mw-redirect" title="Immunoglobulin M deficiency">IgM deficiency</a></li> <li><a href="/wiki/Hyper_IgM_syndrome" title="Hyper IgM syndrome">Hyper IgM syndrome</a> (<a href="/wiki/Hyper-IgM_syndrome_type_1" title="Hyper-IgM syndrome type 1">1</a></li> <li><a href="/wiki/Hyper-IgM_syndrome_type_2" title="Hyper-IgM syndrome type 2">2</a></li> <li><a href="/wiki/Hyper-IgM_syndrome_type_3" title="Hyper-IgM syndrome type 3">3</a></li> <li><a href="/wiki/Hyper-IgM_syndrome_type_4" title="Hyper-IgM syndrome type 4">4</a></li> <li><a href="/wiki/Hyper-IgM_syndrome_type_5" title="Hyper-IgM syndrome type 5">5</a>)</li> <li><a href="/wiki/Wiskott%E2%80%93Aldrich_syndrome" title="Wiskott–Aldrich syndrome">Wiskott–Aldrich syndrome</a></li> <li><a href="/wiki/Hyperimmunoglobulin_E_syndrome" title="Hyperimmunoglobulin E syndrome">Hyper-IgE syndrome</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">Common variable immunodeficiency</a></li> <li><a href="/wiki/ICF_syndrome" class="mw-redirect" title="ICF syndrome">ICF syndrome</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/T_cell_deficiency" title="T cell deficiency">T cell deficiency</a><br />(<a href="/wiki/T_cell" title="T cell">T</a>)</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Thymic_hypoplasia" title="Thymic hypoplasia">thymic hypoplasia</a>:</i> <i>hypoparathyroid</i> (<a href="/wiki/DiGeorge_syndrome" title="DiGeorge syndrome">Di George's syndrome</a>)</li> <li><i>euparathyroid</i> (<a href="/wiki/Nezelof_syndrome" title="Nezelof syndrome">Nezelof syndrome</a></li> <li><a href="/wiki/Ataxia%E2%80%93telangiectasia" title="Ataxia–telangiectasia">Ataxia–telangiectasia</a>)</li></ul> <p><i>peripheral:</i> <a href="/wiki/Purine_nucleoside_phosphorylase_deficiency" title="Purine nucleoside phosphorylase deficiency">Purine nucleoside phosphorylase deficiency</a> </p> <ul><li><a href="/wiki/Hyper_IgM_syndrome" title="Hyper IgM syndrome">Hyper IgM syndrome</a> (<a href="/wiki/Hyper-IgM_syndrome_type_1" title="Hyper-IgM syndrome type 1">1</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Severe_combined_immunodeficiency" title="Severe combined immunodeficiency">Severe</a> <a href="/wiki/Combined_immunodeficiencies" title="Combined immunodeficiencies">combined</a><br />(B+T)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i>x-linked:</i> <a href="/wiki/X-linked_severe_combined_immunodeficiency" title="X-linked severe combined immunodeficiency">X-SCID</a><br /><i>autosomal:</i> <a href="/wiki/Adenosine_deaminase_deficiency" title="Adenosine deaminase deficiency">Adenosine deaminase deficiency</a></li> <li><a href="/wiki/Omenn_syndrome" title="Omenn syndrome">Omenn syndrome</a></li> <li><a href="/wiki/ZAP70_deficiency" title="ZAP70 deficiency">ZAP70 deficiency</a></li> <li><a href="/wiki/Bare_lymphocyte_syndrome" title="Bare lymphocyte syndrome">Bare lymphocyte syndrome</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Immunodeficiency#acquired" title="Immunodeficiency">Acquired</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/HIV/AIDS" title="HIV/AIDS">HIV/AIDS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Leukopenia" title="Leukopenia">Leukopenia</a>:<br /><a href="/wiki/Lymphocytopenia" title="Lymphocytopenia">Lymphocytopenia</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Idiopathic_CD4%2B_lymphocytopenia" title="Idiopathic CD4+ lymphocytopenia">Idiopathic CD4+ lymphocytopenia</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Complement_deficiency" title="Complement deficiency">Complement<br />deficiency</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/C1-inhibitor" title="C1-inhibitor">C1-inhibitor</a></i> (<a href="/wiki/Angioedema" title="Angioedema">Angioedema</a>/<a href="/wiki/Hereditary_angioedema" title="Hereditary angioedema">Hereditary angioedema</a>)</li> <li><a href="/wiki/Complement_2_deficiency" title="Complement 2 deficiency">Complement 2 deficiency</a>/<a href="/wiki/Complement_4_deficiency" title="Complement 4 deficiency">Complement 4 deficiency</a></li> <li><a href="/wiki/MBL_deficiency" title="MBL deficiency">MBL deficiency</a></li> <li><a href="/wiki/Properdin_deficiency" title="Properdin deficiency">Properdin deficiency</a></li> <li><a href="/wiki/Complement_3_deficiency" title="Complement 3 deficiency">Complement 3 deficiency</a></li> <li><a href="/wiki/Terminal_complement_pathway_deficiency" title="Terminal complement pathway deficiency">Terminal complement pathway deficiency</a></li> <li><a href="/wiki/Paroxysmal_nocturnal_hemoglobinuria" title="Paroxysmal nocturnal hemoglobinuria">Paroxysmal nocturnal hemoglobinuria</a></li> <li><a href="/wiki/Complement_receptor_deficiency" class="mw-redirect" title="Complement receptor deficiency">Complement receptor deficiency</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Cell_surface_receptor_deficiencies" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Cell_surface_receptor_deficiencies" title="Template:Cell surface receptor deficiencies"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Cell_surface_receptor_deficiencies" title="Template talk:Cell surface receptor deficiencies"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Cell_surface_receptor_deficiencies" title="Special:EditPage/Template:Cell surface receptor deficiencies"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Cell_surface_receptor_deficiencies" style="font-size:114%;margin:0 4em"><a href="/wiki/Cell_surface_receptor" title="Cell surface receptor">Cell surface receptor</a> deficiencies</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/G_protein-coupled_receptor" title="G protein-coupled receptor">G protein-coupled receptor</a><br />(including <a href="/wiki/Hormone_receptor" title="Hormone receptor">hormone</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Class A</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Thyrotropin_receptor" title="Thyrotropin receptor">TSHR</a></i> (<a href="/wiki/Congenital_hypothyroidism" title="Congenital hypothyroidism">Congenital hypothyroidism 1</a>)</li> <li><i><a href="/wiki/Luteinizing_hormone/choriogonadotropin_receptor" title="Luteinizing hormone/choriogonadotropin receptor">LHCGR</a></i> (<a href="/wiki/Luteinizing_hormone_insensitivity" class="mw-redirect" title="Luteinizing hormone insensitivity">Luteinizing hormone insensitivity</a>, <a href="/wiki/Leydig_cell_hypoplasia" title="Leydig cell hypoplasia">Leydig cell hypoplasia</a>, <a href="/wiki/Male-limited_precocious_puberty" class="mw-redirect" title="Male-limited precocious puberty">Male-limited precocious puberty</a>)</li> <li><i><a href="/wiki/FSH-receptor" class="mw-redirect" title="FSH-receptor">FSHR</a></i> (<a href="/wiki/Follicle-stimulating_hormone_insensitivity" title="Follicle-stimulating hormone insensitivity">Follicle-stimulating hormone insensitivity</a>, <a href="/wiki/XX_gonadal_dysgenesis" title="XX gonadal dysgenesis">XX gonadal dysgenesis</a>)</li> <li><i><a href="/wiki/Gonadotropin-releasing_hormone_receptor" title="Gonadotropin-releasing hormone receptor">GnRHR</a></i> (<a href="/wiki/Gonadotropin-releasing_hormone_insensitivity" title="Gonadotropin-releasing hormone insensitivity">Gonadotropin-releasing hormone insensitivity</a>)</li> <li><i><a href="/wiki/Endothelin_receptor" title="Endothelin receptor">EDNRB</a></i> (<a href="/wiki/ABCD_syndrome" title="ABCD syndrome">ABCD syndrome</a>, <a href="/wiki/Waardenburg_syndrome" title="Waardenburg syndrome">Waardenburg syndrome 4a</a>, <a href="/wiki/Hirschsprung%27s_disease" title="Hirschsprung's disease">Hirschsprung's disease 2</a>)</li> <li><i><a href="/wiki/AVPR2" class="mw-redirect" title="AVPR2">AVPR2</a></i> (<a href="/wiki/Nephrogenic_diabetes_insipidus" title="Nephrogenic diabetes insipidus">Nephrogenic diabetes insipidus 1</a>)</li> <li><i><a href="/wiki/Prostaglandin_E2_receptor" title="Prostaglandin E2 receptor">PTGER2</a></i> (<a href="/wiki/Aspirin-exacerbated_respiratory_disease" title="Aspirin-exacerbated respiratory disease">Aspirin-exacerbated respiratory disease</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Class B</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/PTH1R" class="mw-redirect" title="PTH1R">PTH1R</a></i> (<a href="/wiki/Jansen%27s_metaphyseal_chondrodysplasia" title="Jansen's metaphyseal chondrodysplasia">Jansen's metaphyseal chondrodysplasia</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Class C</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Calcium-sensing_receptor" title="Calcium-sensing receptor">CASR</a></i> (<a href="/wiki/Familial_hypocalciuric_hypercalcemia" title="Familial hypocalciuric hypercalcemia">Familial hypocalciuric hypercalcemia</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Class F</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/FZD4" class="mw-redirect" title="FZD4">FZD4</a></i> (<a href="/wiki/Familial_exudative_vitreoretinopathy" title="Familial exudative vitreoretinopathy">Familial exudative vitreoretinopathy 1</a>)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Enzyme-linked_receptor" title="Enzyme-linked receptor">Enzyme-linked receptor</a><br />(including<br /><a href="/wiki/Growth_factor_receptor" title="Growth factor receptor">growth factor</a>)</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Receptor_tyrosine_kinase" title="Receptor tyrosine kinase">RTK</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/ROR2" title="ROR2">ROR2</a></i> (<a href="/wiki/Robinow_syndrome" title="Robinow syndrome">Robinow syndrome</a>)</li> <li><i><a href="/wiki/Fibroblast_growth_factor_receptor_1" title="Fibroblast growth factor receptor 1">FGFR1</a></i> (<a href="/wiki/Pfeiffer_syndrome" title="Pfeiffer syndrome">Pfeiffer syndrome</a>, <a href="/wiki/Kallmann_syndrome" title="Kallmann syndrome">KAL2 Kallmann syndrome</a>)</li> <li><i><a href="/wiki/Fibroblast_growth_factor_receptor_2" title="Fibroblast growth factor receptor 2">FGFR2</a></i> (<a href="/wiki/Apert_syndrome" title="Apert syndrome">Apert syndrome</a>, <a href="/wiki/Antley%E2%80%93Bixler_syndrome" title="Antley–Bixler syndrome">Antley–Bixler syndrome</a>, <a href="/wiki/Pfeiffer_syndrome" title="Pfeiffer syndrome">Pfeiffer syndrome</a>, <a href="/wiki/Crouzon_syndrome" title="Crouzon syndrome">Crouzon syndrome</a>, <a href="/wiki/Jackson%E2%80%93Weiss_syndrome" title="Jackson–Weiss syndrome">Jackson–Weiss syndrome</a>)</li> <li><i><a href="/wiki/Fibroblast_growth_factor_receptor_3" title="Fibroblast growth factor receptor 3">FGFR3</a></i> (<a href="/wiki/Achondroplasia" title="Achondroplasia">Achondroplasia</a>, <a href="/wiki/Hypochondroplasia" title="Hypochondroplasia">Hypochondroplasia</a>, <a href="/wiki/Thanatophoric_dysplasia" title="Thanatophoric dysplasia">Thanatophoric dysplasia</a>, <a href="/wiki/Muenke_syndrome" title="Muenke syndrome">Muenke syndrome</a>)</li> <li><i><a href="/wiki/Insulin_receptor" title="Insulin receptor">INSR</a></i> (<a href="/wiki/Donohue_syndrome" title="Donohue syndrome">Donohue syndrome</a></li> <li><a href="/wiki/Rabson%E2%80%93Mendenhall_syndrome" title="Rabson–Mendenhall syndrome">Rabson–Mendenhall syndrome</a>)</li> <li><i><a href="/wiki/TrkA_receptor" class="mw-redirect" title="TrkA receptor">NTRK1</a></i> (<a href="/wiki/Congenital_insensitivity_to_pain_with_anhidrosis" title="Congenital insensitivity to pain with anhidrosis">Congenital insensitivity to pain with anhidrosis</a>)</li> <li><i><a href="/wiki/CD117" class="mw-redirect" title="CD117">KIT</a></i> (<a href="/wiki/Piebaldism" title="Piebaldism">KIT Piebaldism</a>, <a href="/wiki/Gastrointestinal_stromal_tumor" title="Gastrointestinal stromal tumor">Gastrointestinal stromal tumor</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Serine/threonine-specific_protein_kinase" title="Serine/threonine-specific protein kinase">STPK</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Anti-M%C3%BCllerian_hormone_receptor" title="Anti-Müllerian hormone receptor">AMHR2</a></i> (<a href="/wiki/Persistent_M%C3%BCllerian_duct_syndrome" title="Persistent Müllerian duct syndrome">Persistent Müllerian duct syndrome II</a>)</li></ul> <ul><li><a href="/wiki/TGF_beta_receptors" class="mw-redirect" title="TGF beta receptors">TGF beta receptors</a>: <a href="/wiki/Endoglin" title="Endoglin">Endoglin</a>/<a href="/wiki/ACVRL1" title="ACVRL1">Alk-1</a>/<a href="/wiki/Mothers_against_decapentaplegic_homolog_4" title="Mothers against decapentaplegic homolog 4">SMAD4</a> (<a href="/wiki/Hereditary_hemorrhagic_telangiectasia" title="Hereditary hemorrhagic telangiectasia">Hereditary hemorrhagic telangiectasia</a>)</li> <li><a href="/wiki/TGF_beta_receptor_1" title="TGF beta receptor 1">TGFBR1</a>/<a href="/wiki/TGF_beta_receptor_2" title="TGF beta receptor 2">TGFBR2</a> (<a href="/wiki/Loeys%E2%80%93Dietz_syndrome" title="Loeys–Dietz syndrome">Loeys–Dietz syndrome</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Guanylate_cyclase" title="Guanylate cyclase">GC</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/GUCY2D" title="GUCY2D">GUCY2D</a></i> (<a href="/wiki/Leber%27s_congenital_amaurosis" class="mw-redirect" title="Leber's congenital amaurosis">Leber's congenital amaurosis 1</a>)</li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/JAK-STAT_signaling_pathway" title="JAK-STAT signaling pathway">JAK-STAT</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Type_I_cytokine_receptor" title="Type I cytokine receptor">Type I cytokine receptor</a>: <i><a href="/wiki/Growth_hormone_receptor" title="Growth hormone receptor">GH</a></i> (<a href="/wiki/Laron_syndrome" title="Laron syndrome">Laron syndrome</a>)</li> <li><i><a href="/wiki/Granulocyte_macrophage_colony-stimulating_factor_receptor" class="mw-redirect" title="Granulocyte macrophage colony-stimulating factor receptor">CSF2RA</a></i> (<a href="/wiki/Surfactant_metabolism_dysfunction" title="Surfactant metabolism dysfunction">Surfactant metabolism dysfunction 4</a>)</li></ul> <ul><li><a href="/wiki/Myeloproliferative_leukemia_virus_oncogene" class="mw-redirect" title="Myeloproliferative leukemia virus oncogene">MPL</a> (<a href="/wiki/Congenital_amegakaryocytic_thrombocytopenia" title="Congenital amegakaryocytic thrombocytopenia">Congenital amegakaryocytic thrombocytopenia</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Tumor_necrosis_factor_receptor" class="mw-redirect" title="Tumor necrosis factor receptor">TNF receptor</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/TNFRSF1A" class="mw-redirect" title="TNFRSF1A">TNFRSF1A</a></i> (<a href="/wiki/TNF_receptor_associated_periodic_syndrome" title="TNF receptor associated periodic syndrome">TNF receptor associated periodic syndrome</a>)</li> <li><i><a href="/wiki/TNFRSF13B" class="mw-redirect" title="TNFRSF13B">TNFRSF13B</a></i> (<a class="mw-selflink selflink">Selective immunoglobulin A deficiency 2</a>)</li> <li><i><a href="/wiki/CD40_(protein)" title="CD40 (protein)">TNFRSF5</a></i> (<a href="/wiki/Hyper-IgM_syndrome_type_3" title="Hyper-IgM syndrome type 3">Hyper-IgM syndrome type 3</a>)</li> <li><i><a href="/wiki/TNFRSF13C" class="mw-redirect" title="TNFRSF13C">TNFRSF13C</a></i> (<a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">CVID4</a>)</li> <li><i><a href="/wiki/TNFRSF13B" class="mw-redirect" title="TNFRSF13B">TNFRSF13B</a></i> (<a href="/wiki/Common_variable_immunodeficiency" title="Common variable immunodeficiency">CVID2</a>)</li> <li><i><a href="/wiki/Fas_receptor" title="Fas receptor">TNFRSF6</a></i> (<a href="/wiki/Autoimmune_lymphoproliferative_syndrome" title="Autoimmune lymphoproliferative syndrome">Autoimmune lymphoproliferative syndrome 1A</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Lipid receptor</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Lipoprotein_receptor-related_protein" title="Lipoprotein receptor-related protein">LRP</a>: <i><a href="/wiki/LRP2" title="LRP2">LRP2</a></i> (<a href="/wiki/Donnai%E2%80%93Barrow_syndrome" title="Donnai–Barrow syndrome">Donnai–Barrow syndrome</a>)</li> <li><i><a href="/wiki/Low_density_lipoprotein_receptor-related_protein_4" class="mw-redirect" title="Low density lipoprotein receptor-related protein 4">LRP4</a></i> (<a href="/wiki/Cenani%E2%80%93Lenz_syndactylism" title="Cenani–Lenz syndactylism">Cenani–Lenz syndactylism</a>)</li> <li><i><a href="/wiki/LRP5" title="LRP5">LRP5</a></i> (<a href="/wiki/Worth_syndrome" title="Worth syndrome">Worth syndrome</a>, <a href="/wiki/Familial_exudative_vitreoretinopathy" title="Familial exudative vitreoretinopathy">Familial exudative vitreoretinopathy 4</a>, <a href="/wiki/Osteopetrosis" title="Osteopetrosis">Osteopetrosis 1</a>)</li></ul> <ul><li><i><a href="/wiki/LDL_receptor" title="LDL receptor">LDLR</a></i> (<a href="/wiki/Familial_hypercholesterolemia" title="Familial hypercholesterolemia">LDLR Familial hypercholesterolemia</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other/ungrouped</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Immunoglobulin_superfamily" title="Immunoglobulin superfamily">Immunoglobulin superfamily</a>: <a href="/wiki/Hypogammaglobulinemia" title="Hypogammaglobulinemia">AGM3, 6</a></li></ul> <ul><li><a href="/wiki/Integrin" title="Integrin">Integrin</a>: <a href="/wiki/Leukocyte_adhesion_deficiency-1" title="Leukocyte adhesion deficiency-1">LAD1</a></li> <li><a href="/wiki/Glanzmann%27s_thrombasthenia" title="Glanzmann's thrombasthenia">Glanzmann's thrombasthenia</a></li> <li><a href="/wiki/Junctional_epidermolysis_bullosa_with_pyloric_atresia" class="mw-redirect" title="Junctional epidermolysis bullosa with pyloric atresia">Junctional epidermolysis bullosa with pyloric atresia</a></li></ul> <p><i><a href="/wiki/EDAR" class="mw-redirect" title="EDAR">EDAR</a></i> (<a href="/wiki/Hypohidrotic_ectodermal_dysplasia" title="Hypohidrotic ectodermal dysplasia">EDAR hypohidrotic ectodermal dysplasia</a>) </p> <ul><li><i><a href="/wiki/PTCH1" title="PTCH1">PTCH1</a></i> (<a href="/wiki/Nevoid_basal-cell_carcinoma_syndrome" title="Nevoid basal-cell carcinoma syndrome">Nevoid basal-cell carcinoma syndrome</a>)</li> <li><i><a href="/wiki/BMPR1A" title="BMPR1A">BMPR1A</a></i> (<a href="/wiki/Juvenile_polyposis_syndrome" title="Juvenile polyposis syndrome">BMPR1A juvenile polyposis syndrome</a>)</li> <li><i><a href="/wiki/IL2RG" class="mw-redirect" title="IL2RG">IL2RG</a></i> (<a href="/wiki/X-linked_severe_combined_immunodeficiency" title="X-linked severe combined immunodeficiency">X-linked severe combined immunodeficiency</a>)</li></ul> <dl><dt>See also</dt> <dd><a href="/wiki/Template:Cell_surface_receptors" title="Template:Cell surface receptors">cell surface receptors</a></dd></dl> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Selective_immunoglobulin_A_deficiency&oldid=1219856945">https://en.wikipedia.org/w/index.php?title=Selective_immunoglobulin_A_deficiency&oldid=1219856945</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" 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