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Sox12 deletion in the mouse reveals nonreciprocal redundancy with the related Sox4 and Sox11 transcription factors.

Hoser M., Potzner M.R., Koch J.M., Boesl M.R., Wegner M., Sock E.

The transcription factors Sox4 and Sox11 are important regulators of diverse developmental processes including heart, lung, pancreas, spleen, and B-cell development. Here we have studied the role of the related Sox12 as the third protein of the SoxC group both in vivo and in vitro. Despite widespread Sox12 expression during embryonic development, Sox12-deficient mice developed surprisingly normally, so that they were born alive, showed no gross phenotypic abnormalities, and were fertile in both sexes. Comparison with the related Sox4 and Sox11 revealed extensive overlap in the embryonic expression pattern but more uniform expression levels for Sox12, without sites of particularly high expression. All three Sox proteins furthermore exhibited comparable DNA-binding characteristics and functioned as transcriptional activators. Sox12 was, however, a relatively weak transactivator in comparison to Sox11. We conclude that Sox4 and Sox11 function redundantly with Sox12 and can compensate its loss during mouse development. Because of differences in expression levels and transactivation rates, however, functional compensation is not reciprocal.

Mol. Cell. Biol. 28:4675-4687(2008) [PubMed] [Europe PMC]

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