[No authors listed]
During B cell development, there is an ordered expression of heavy chain variable region (VH) genes during ontogeny such that JH proximal VH genes are rearranged and expressed before the more JH distal VH genes. Thus, the relative chromosomal position of VH genes is biologically significant. We have previously employed deletion mapping to order the nine described murine VH gene families as follows: 3609-J558-(J606/VGAM3-8/S107)-3660-(X24/Q52/7183 ). (Families within parentheses were not mapped relative to each other.) In this report we continue this analysis by mapping two recently described heavy chain variable region gene families (VH10 and VH11). VH10 is located at the JH proximal end of the major cluster of J558 VH gene segments. VH11 (a very small family) is intermingled with the 3660 family. Although in general VH genes are thought to be clustered, we and others have reported some interspersion between families. To further address this issue, we have analyzed 80 recombinant phage clones containing J558 VH gene segments for the presence of other VH family genes. Our data indicate that the J558 and 3609 VH families are extensively intermingled as has recently been described for the most JH proximal Q52 and 7183 families.
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