Abstract:Cow antibodies are very unusual in having exceptionally long CDR H3 regions. The genetic basis for this length largely derives from long heavy chain diversity (DH) regions, with a single “ultralong” DH, IGHD8-2, encoding over fifty amino acids. Most bovine IGHD regions are homologous but have several nucleotide repeating units that diversify their lengths. Genomically, most DH regions exist in three clusters that appear to have formed from DNA duplication events. The cluster containing IGHD8-2 underwent a rear… Show more
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