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.
• SEM-2 is the sole SoxC protein in C. elegans, vital for development and specifying the sex myoblast (SM) fate.

Purpose of the Study:

• Investigate novel functions of 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, SM proliferation, and diversification.

Main Methods:

• Genetic analysis of a novel sem-2 loss-of-function allele.
• Detailed characterization of mutant phenotypes in C. elegans.
• Investigation of gene regulatory interactions within the M lineage.

Main Results:

• SEM-2 antagonistically regulates M lineage dorsoventral patterning with LET-381 (FoxF/C).
• SEM-2 is essential for SM lineage proliferation and diversification, beyond fate specification.
• SEM-2 directly regulates hlh-8, a gene encoding a Twist transcription factor.

Conclusions:

• SEM-2 has newly identified roles in C. elegans M lineage development.
• A conserved relationship exists between SoxC and Twist proteins.
• New gene regulatory network interactions for C. elegans postembryonic development were identified.