Sex determination in the germ line

Area of Science:

• Developmental biology
• Genetics
• Molecular biology

Background:

• Sexual identity is a fundamental developmental parameter.
• Sex determination influences many tissues, with a key role in germ cell differentiation.
• C. elegans hermaphrodites offer a unique model for studying germ cell fate from a common progenitor pool.

Purpose of the Study:

• To review genetic and molecular models of germline sexual fate control in C. elegans.
• To summarize evidence for conserved and unique regulatory features in germline sex determination.
• To present models for how spermatogenesis and oogenesis are regulated in hermaphrodites.

Main Methods:

• Genetic analysis of sexual fate control genes.
• Molecular studies of gene regulation in germ cells.
• Review of existing literature and experimental evidence.

Main Results:

• Sexual fate of C. elegans germ cells is controlled by genes regulating overall sexual identity.
• Germline-specific genes (e.g., fogs) and pathways (e.g., fem genes, tra-1 targets) are crucial.
• Translational repression of tra-2 and fem-3 are essential for spermatogenesis and oogenesis, respectively.

Conclusions:

• The control of germ cell sexual fate in C. elegans involves both conserved and germline-specific regulatory mechanisms.
• Specific gene interactions and translational control fine-tune spermatogenesis and oogenesis.
• Understanding these pathways provides insights into fundamental developmental processes.