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2014 ; 123
(26
): 4064-76
Nephropedia Template TP
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Integrated genetic approaches identify the molecular mechanisms of Sox4 in early
B-cell development: intricate roles for RAG1/2 and CK1?
#MMPMID24786772
Mallampati S
; Sun B
; Lu Y
; Ma H
; Gong Y
; Wang D
; Lee JS
; Lin K
; Sun X
Blood
2014[Jun]; 123
(26
): 4064-76
PMID24786772
show ga
Commitment of hematopoietic stem cells to B lineage precursors and subsequent
development of B lineage precursors into mature B cells is stringently controlled
by stage-specific transcription factors. In this study, we used integrated
genetic approaches and systematically determined the role of Sry-related high
mobility group box (Sox) 4 and the underlying molecular mechanisms in early
B-cell development. We found that Sox4 coordinates multilevel controls in the
differentiation of early stage B cells. At the molecular level, Sox4 orchestrates
a unique gene regulatory program, and its function was predominantly mediated
through a conventional Sox4-binding motif as well as an unconventional GA-binding
protein ? chain binding motif. Our integrated gene network and functional
analysis indicated that Sox4 functions as a bimodular transcription factor and
ensures B lineage precursor differentiation through 2 distinct mechanisms. It
positively induces gene rearrangements at immunoglobulin heavy chain gene loci by
transcriptionally activating the Rag1 and Rag2 genes and negatively regulates Wnt
signaling, which is critical for self-renewal, by inducing the expression of
casein kinase 1 ?. Our findings illustrate that Sox4 mediates critical
fine-tuning of the 2 opposing forces in early B-cell development and also set
forth a model for characterization of critical genes whose deficiency, like Sox4
deficiency, is detrimental to this process.