Abstract
Rearrangement of the Ig locus occurs in two steps. First, a JH gene is rearranged to a D gene followed by a VH gene rearranging to the DJH rearrangement. By next generation sequencing, we analyzed 9969 unique DJH rearrangements and 5919 unique VHDJH rearrangements obtained from peripheral blood B cells from 110 healthy adult donors. We found that DJH rearrangements and nonproductive VHDJH rearrangements share many features but differ significantly in their use of D genes and propensity for somatic hypermutation. In D to JH gene rearrangements, the D genes proximal to the JH locus are used more frequently than JH locus distal D genes, whereas VH locus proximal D genes were observed more frequently in nonproductive VHDJH rearrangements. We further demonstrate that the distance between VH, D, and JH gene segments influence their ability to rearrange within the human Ig locus.
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