SEM-2/SoxC regulates multiple aspects of C. elegans postembryonic mesoderm development.

Area of Science:

• Developmental Biology
• Genetics
• Molecular Biology

Background:

• Multicellular development relies on transcription factors and cell signaling.
• SoxC proteins are conserved transcription factors with diverse developmental roles.
• In C. elegans, SEM-2 is the only SoxC protein, vital for embryonic and postembryonic development.

Purpose of the Study:

• Investigate novel functions of the SoxC protein SEM-2 in the C. elegans M lineage.
• Characterize a new partial loss-of-function sem-2 allele.
• Elucidate SEM-2's role in M lineage patterning, proliferation, and diversification.

Main Methods:

• Analysis of a novel sem-2 point mutant allele.
• Detailed examination of SEM-2's function in the M lineage.
• Investigation of SEM-2's interactions with LET-381 and regulation of hlh-8.

Main Results:

• SEM-2 antagonizes LET-381 in M lineage dorsoventral patterning.
• SEM-2 is essential for sex myoblast proliferation and diversification.
• SEM-2 directly regulates the expression of the Twist transcription factor hlh-8.

Conclusions:

• SEM-2 has new roles in M lineage development beyond sex myoblast fate specification.
• A conserved relationship exists between SoxC and Twist proteins.
• New gene regulatory network interactions in C. elegans development were identified.