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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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B cell-specific loss of histone 3 lysine 9 methylation in the V(H) locus depends on Pax5.

Immunoglobulin heavy chain rearrangement (V(H)-to-DJ(H)) occurs only in B cells, suggesting it is inhibited in other lineages. Here we found that in the mouse V(H) locus, methylation of lysine 9 on histone H3 (H3-K9), a mark of inactive chromatin, was present in non-B lineage cells but was absent in B cells. As others have shown that H3-K9 methylation can inhibit V(D)J recombination on engineered substrates, our data support the idea that H3-K9 methylation inhibits endogenous V(H)-to-DJ(H) recombination. We also show that Pax5, a transcription factor required for B cell commitment, is necessary and sufficient for the removal of H3-K9 methylation in the V(H) locus and provide evidence that one function of Pax5 is to remove this inhibitory modification by a mechanism of histone exchange, thus allowing B cell-specific V(H)-to-DJ(H) recombination.[1]

References

  1. B cell-specific loss of histone 3 lysine 9 methylation in the V(H) locus depends on Pax5. Johnson, K., Pflugh, D.L., Yu, D., Hesslein, D.G., Lin, K.I., Bothwell, A.L., Thomas-Tikhonenko, A., Schatz, D.G., Calame, K. Nat. Immunol. (2004) [Pubmed]
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