Abstract
When immunoglobulin (Ig) gene rearrangements are analyzed, several patterns emerge. The rearrangements at the various loci generally appear in a specific temporal order. In addition, within a given locus the frequency of rearrangement of the various gene segments is not equal but is skewed towards preferential rearrangement of particular gene segments. Understanding the reasons for these patterns will shed light on the mechanism of recombination, the regulation of rearrangement, and the relationship between Ig gene rearrangement and B cell development. In this review, we discuss evidence that the observed patterns of Ig gene rearrangement are due to a combination of factors including the recombination signal sequences, sequences in the coding termini, the accessibility of genetic elements to V(D)J recombinase, and cellular selection.
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