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<script type="text/javascript" src="/corehtml/pmc/jatsreader/ptpmc_3.22/js/jr.boots.min.js"> </script><title>ABO Blood Group - Medical Genetics Summaries - NCBI Bookshelf</title>
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<meta name="citation_date" content="2015/07/27">
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<meta name="citation_author" content="Laura Dean">
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yet</button><a id="jr-fip-next" class="wsprkl btn" title="Jump to next match">▶</a></nav></nav></div><div id="jr-epub-interstitial" class="hidden"></div><div id="jr-content"><article data-type="main"><div class="main-content lit-style" itemscope="itemscope" itemtype="http://schema.org/CreativeWork"><div class="meta-content fm-sec"><div class="fm-sec"><h1 id="_NBK100894_"><span class="title" itemprop="name">ABO Blood Group</span></h1><p class="contribs">Dean L.</p><p class="fm-aai"><a href="#_NBK100894_pubdet_">Publication Details</a></p><p><em>Estimated reading time: 3 minutes</em></p></div></div><div class="jig-ncbiinpagenav body-content whole_rhythm" data-jigconfig="allHeadingLevels: ['h2'],smoothScroll: false" itemprop="text"><div id="abo.Characteristics"><h2 id="_abo_Characteristics_">Characteristics</h2><p>There are four common blood groups in the ABO system: O, A, B, and AB. The blood groups are defined by the presence of specific carbohydrate sugars on the surface of red blood cells, N-acetylgalactosamine for the A antigen, and D-galactose for the B antigen. Both of these sugars are built upon the H antigen—if the H antigen is left unmodified, the resulting blood group is O because neither the A nor the B antigen can attach to the red blood cells.</p><p>Individuals will naturally develop antibodies against the ABO antigens they do not have. For example, individuals with blood group A will have anti-B antibodies, and individuals with blood group O will have both anti-A and anti-B. Before a blood transfusion takes place, routine serological testing checks the compatibility of the ABO (and Rh) blood groups. An ABO incompatible blood transfusion can be fatal, due to the highly immunogenic nature of the A and B antigens, and the corresponding strongly hemolytic antibodies (<a class="bibr" href="#abo.REF.1" rid="abo.REF.1">1</a>).</p><p>Compared to other blood groups, individuals with blood group O may have a lower risk of pancreatic cancer and thromboembolic disease (<a class="bibr" href="#abo.REF.2" rid="abo.REF.2">2</a>, <a class="bibr" href="#abo.REF.3" rid="abo.REF.3">3</a>). In addition, in certain African populations, individuals with the blood group O may be protected from life-threatening malaria (<a class="bibr" href="#abo.REF.4" rid="abo.REF.4">4</a>). However, this blood group is not more common in some regions where malaria is endemic. This might be because individuals with blood group O are at higher risk of cholera and severe diarrhea due to <i>Vibrio cholerae</i> 01, with individuals with the AB blood group being the most protected (<a class="bibr" href="#abo.REF.5" rid="abo.REF.5">5</a>, <a class="bibr" href="#abo.REF.6" rid="abo.REF.6">6</a>).</p><p>Over 80 <i>ABO</i> alleles have been reported. The common alleles include <i>A1</i>, <i>A2</i>, <i>B1</i>, <i>O1</i>, <i>O1v</i>, and <i>O2</i> (<a class="bibr" href="#abo.REF.7" rid="abo.REF.7">7</a>). Whereas the <i>A</i> and <i>B</i> alleles each encode a specific glycosyl-transferring enzyme, the <i>O</i> allele appears to have no function. A single-base deletion in the <i>O</i> allele means that individuals with blood group O do not produce either the A or B antigens. Blood type frequencies vary in different racial/ethnic groups. In the US, in Caucasians, the ratio of blood group O, A, B, and AB is 45%, 40%, 11%, and 4% respectively. In Hispanics, the distribution is 57%, 31%, 10%, and 3%; and in Blacks, 50%, 26%, 20%, and 4% (<a class="bibr" href="#abo.REF.8" rid="abo.REF.8">8</a>).</p></div><div id="abo.Diagnosistesting"><h2 id="_abo_Diagnosistesting_">Diagnosis/testing</h2><p>Serological testing is sufficient to determine an individual’s blood type (e.g., blood group A) for the purposes of blood donation and transfusion. Molecular genetic testing can be used to determine an individual’s <i>ABO</i> genotype (e.g., genotype <i>AO</i> or <i>AA</i>). This may be useful in the research setting, for example, to investigate the link between ABO blood groups and particular diseases, and also in the forensic setting (<a class="bibr" href="#abo.REF.9" rid="abo.REF.9">9</a>).</p></div><div id="abo.Management"><h2 id="_abo_Management_">Management</h2><p>Determining an individual’s blood group is important prior to blood transfusion and prior to the donation or receiving of a kidney transplant.</p><p>Occasionally, a person’s blood type may appear to change. For example, the ABO antigens can act as tumor markers. Their presence may be decreased in particular diseases, such as acute myeloid leukemia, AML (<a class="bibr" href="#abo.REF.10" rid="abo.REF.10">10</a>). In contrast, occasionally the B antigen may be acquired in certain infectious diseases. A bacterial infection with specific strains of <i>E. coli</i> or <i>Clostridium tertium</i> can generate a B-like antigen from an individual who has the <i>A1</i> allele (<a class="bibr" href="#abo.REF.11" rid="abo.REF.11">11</a>).</p></div><div id="abo.Genetic_counseling"><h2 id="_abo_Genetic_counseling_">Genetic counseling</h2><p>The ABO blood type is inherited in an autosomal codominant fashion. The <i>A</i> and <i>B</i> alleles are codominant, and the <i>O</i> allele is recessive.</p></div><div id="abo.Acknowledgments"><h2 id="_abo_Acknowledgments_">Acknowledgments</h2><p>The author would like to thank Michael Murphy, Professor of Blood Transfusion Medicine, University of Oxford, and Consultant Haematologist, NHS Blood & Transplant and Oxford University Hospitals, Oxford, UK, for reviewing this summary.</p></div><div id="abo.References"><h2 id="_abo_References_">References</h2><dl class="temp-labeled-list"><dl class="bkr_refwrap"><dt>1.</dt><dd><div class="bk_ref" id="abo.REF.1">Food and Drug Administration. Rockville (MD) Transfusion/Donation Fatalities: Notification Process for Transfusion Related Fatalities and Donation Related Deaths. [cited 2012 Sep 26]. Available from: <a href="https://www.fda.gov/vaccines-blood-biologics/report-problem-center-biologics-evaluation-research/transfusiondonation-fatalities" ref="pagearea=cite-ref&targetsite=external&targetcat=link&targettype=uri">https://www<wbr style="display:inline-block"></wbr>​.fda.gov/vaccines-blood-biologics<wbr style="display:inline-block"></wbr>​/report-problem-center-biologics-evaluation-research<wbr style="display:inline-block"></wbr>​/transfusiondonation-fatalities</a>.</div></dd></dl><dl class="bkr_refwrap"><dt>2.</dt><dd><div class="bk_ref" id="abo.REF.2">Amundadottir L., Kraft P., Stolzenberg-Solomon R.Z., Fuchs C.S., et al. Genome-wide association study identifies variants in the ABO locus associated with susceptibility to pancreatic cancer. <span><span class="ref-journal">Nature genetics. </span>2009;<span class="ref-vol">41</span>(9):986–90.</span> [<a href="/pmc/articles/PMC2839871/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2839871</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/19648918" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 19648918</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>3.</dt><dd><div class="bk_ref" id="abo.REF.3">Tregouet D.A., Heath S., Saut N., Biron-Andreani C., et al. Common susceptibility alleles are unlikely to contribute as strongly as the FV and ABO loci to VTE risk: results from a GWAS approach. <span><span class="ref-journal">Blood. </span>2009;<span class="ref-vol">113</span>(21):5298–303.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/19278955" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 19278955</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>4.</dt><dd><div class="bk_ref" id="abo.REF.4">Fry A.E., Griffiths M.J., Auburn S., Diakite M., et al. Common variation in the ABO glycosyltransferase is associated with susceptibility to severe Plasmodium falciparum malaria. <span><span class="ref-journal">Human molecular genetics. </span>2008;<span class="ref-vol">17</span>(4):567–76.</span> [<a href="/pmc/articles/PMC2657867/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2657867</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/18003641" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 18003641</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>5.</dt><dd><div class="bk_ref" id="abo.REF.5">Faruque A.S., Mahalanabis D., Hoque S.S., Albert M.J. The relationship between ABO blood groups and susceptibility to diarrhea due to Vibrio cholerae 0139. <span><span class="ref-journal">Clinical infectious diseases. </span>1994;<span class="ref-vol">18</span>(5):827–8.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/8075282" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 8075282</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>6.</dt><dd><div class="bk_ref" id="abo.REF.6">Rowe J.A., Handel I.G., Thera M.A., Deans A.M., et al. Blood group O protects against severe Plasmodium falciparum malaria through the mechanism of reduced rosetting. <span><span class="ref-journal">Proceedings of the National Academy of Sciences of the United States of America. </span>2007;<span class="ref-vol">104</span>(44):17471–6.</span> [<a href="/pmc/articles/PMC2077280/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2077280</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/17959777" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 17959777</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>7.</dt><dd><div class="bk_ref" id="abo.REF.7">Seltsam A., Hallensleben M., Kollmann A., Blasczyk R. The nature of diversity and diversification at the ABO locus. <span><span class="ref-journal">Blood. </span>2003;<span class="ref-vol">102</span>(8):3035–42.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/12829588" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 12829588</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>8.</dt><dd><div class="bk_ref" id="abo.REF.8">Garratty G., Glynn S.A., McEntire R. ABO and Rh(D) phenotype frequencies of different racial/ethnic groups in the United States. <span><span class="ref-journal">Transfusion. </span>2004;<span class="ref-vol">44</span>(5):703–6.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/15104651" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 15104651</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>9.</dt><dd><div class="bk_ref" id="abo.REF.9">Johnson P.H., Hopkinson D.A. Detection of ABO blood group polymorphism by denaturing gradient gel electrophoresis. <span><span class="ref-journal">Human molecular genetics. </span>1992;<span class="ref-vol">1</span>(5):341–4.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/1303212" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 1303212</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>10.</dt><dd><div class="bk_ref" id="abo.REF.10">Bianco-Miotto T., Hussey D.J., Day T.K., O'Keefe D.S., Dobrovic A. DNA methylation of the ABO promoter underlies loss of ABO allelic expression in a significant proportion of leukemic patients. <span><span class="ref-journal">PloS one. </span>2009;<span class="ref-vol">4</span>(3):e4788. </span> p. [<a href="/pmc/articles/PMC2650780/" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pmc">PMC free article<span class="bk_prnt">: PMC2650780</span></a>] [<a href="https://pubmed.ncbi.nlm.nih.gov/19274076" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 19274076</span></a>]</div></dd></dl><dl class="bkr_refwrap"><dt>11.</dt><dd><div class="bk_ref" id="abo.REF.11">Roath S., Todd C.E., Shaw D. Transient acquired blood group B antigen associated with diverticular bowel disease. <span><span class="ref-journal">Acta haematologica. </span>1987;<span class="ref-vol">77</span>(3):188–90.</span> [<a href="https://pubmed.ncbi.nlm.nih.gov/3113163" ref="pagearea=cite-ref&targetsite=entrez&targetcat=link&targettype=pubmed">PubMed<span class="bk_prnt">: 3113163</span></a>]</div></dd></dl></dl></div><div id="bk_toc_contnr"></div></div></div><div class="fm-sec"><h2 id="_NBK100894_pubdet_">Publication Details</h2><h3>Author Information and Affiliations</h3><p class="contrib-group"><h4>Authors</h4><span itemprop="author">Laura Dean</span>, MD<sup>1</sup>.</p><h4>Affiliations</h4><div class="affiliation"><sup>1</sup> NCBI<div><span class="email-label">Email: </span><a href="mailto:dev@null" data-email="vog.hin.mln.ibcn@naed" class="oemail">vog.hin.mln.ibcn@naed</a></div></div><h3>Publication History</h3><p class="small">Created: <span itemprop="datePublished">October 1, 2012</span>; Last Update: <span itemprop="dateModified">July 27, 2015</span>.</p><h3>Copyright</h3><div><div class="half_rhythm"><a href="/books/about/copyright/">Copyright Notice</a><p class="small">All Medical Genetics Summaries content, except where otherwise noted, is licensed under a Creative Commons <a href="https://creativecommons.org/licenses/by/4.0/" ref="pagearea=meta&targetsite=external&targetcat=link&targettype=uri">Attribution 4.0 International (CC BY 4.0)</a> license which permits copying, distribution, and adaptation of the work, provided the original work is properly cited and any changes from the original work are properly indicated. Any altered, transformed, or adapted form of the work may only be distributed under the same or similar license to this one.</p></div></div><h3>Publisher</h3><p><a href="http://www.ncbi.nlm.nih.gov/sites/entrez?db=books" ref="pagearea=page-banner&targetsite=external&targetcat=link&targettype=publisher">National Center for Biotechnology Information (US)</a>, Bethesda (MD)</p><h3>NLM Citation</h3><p>Dean L. ABO Blood Group. 2012 Oct 1 [Updated 2015 Jul 27]. In: Pratt VM, Scott SA, Pirmohamed M, et al., editors. Medical Genetics Summaries [Internet]. 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