PMID: 9171891Dec 1, 1996Paper

Rabbit DQ52 and DH gene expression in early B-cell development

Molecular Immunology
H T ChenR G Mage

Abstract

Rabbits predominantly rearrange the most 3'VH gene (VH1); thus combinatorial diversity is very limited. In man and mouse, the most 3'DH gene, DQ52, is preferentially rearranged early in B-cell development. To test whether this preference for rearranging a DH gene segment based on 3' end proximity exists in rabbit, we cloned and sequenced the rabbit DQ52 gene. The 11 base pair coding region sequence is identical to a published mouse DQ52, and 81.8% similar to the human sequence. It is localized approximately 805 bp upstream of the JH1 gene. However, the 3' recombination signal sequence has an atypical nonamer. We prepared mRNA from 15- to 28-day fetal rabbits and amplified expressed VDJ sequences of mu mRNA by RT-PCR. The PCR products with VDJ rearrangements were cloned and sequenced. As expected, 44 of 45 VDJ sequences reflected use of the 3' VH1a2 gene, but the DQ52 gene was utilized very infrequently, if at all. We found only one VDJ sequence from 28-day fetal liver B-cells with 8 bp that matched the germline DQ52 sequence. Instead of expressing DQ52, another DH gene, Df was frequently expressed. We cloned the genomic Df gene and localized it about 32 kb upstream of the JH region. Thus, in contrast to man and mouse, rabbits p...Continue Reading

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Citations

Feb 5, 2000·The Journal of Immunology : Official Journal of the American Association of Immunologists·J R Hayman, C J Lobb
Dec 20, 2000·The Journal of Immunology : Official Journal of the American Association of Immunologists·J E ButlerR K Christenson
May 23, 2002·The Journal of Immunology : Official Journal of the American Association of Immunologists·Devinder SehgalRose G Mage

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