CELE_H14A12.4, tbx-17, H14A12.4

mls-1 encodes a T-box transcription factor orthologous to members of the Tbx1 subfamily of T-box transcription factors (OMIM:602054, mutations in human TBX1 are associated with the developmental disorder DiGeorge syndrome (DGS)/velocardiofacial syndrome (VCFS)); MLS-1 is required for fate specification of the eight nonstriated uterine muscle cells generated during postembryonic development, and ectopic expression of MLS-1 is sufficient for uterine muscle specification in other mesodermal lineages; mls-1 reporter gene expression is detected in uterine progenitors and differentiated uterine muscles, Type 2 vulval muscles, the left and right intestinal muscles, and the anal depressor muscle; mls-1 expression is positively regulated by the basic helix-loop-helix transcription factors HLH-8/Twist and HLH-2/Daughterless.

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