Specification of the germ line.
In C. elegans, the germ line is set apart from the soma early in embryogenesis. Several important themes have emerged in specifying and guiding the development of the nascent germ line. At early stages, the germline blastomeres are maintained in a transcriptionally silent state by the transcriptional repressor PIE-1. When this silencing is lifted, it is postulated that correct patterns of germline gene expression are controlled, at least in part, by MES-mediated regulation of chromatin state. Accompanying transcriptional regulation by PIE-1 and the MES proteins, RNA metabolism in germ cells is likely to be regulated by perinuclear RNA-rich cytoplasmic granules, termed P granules. This chapter discusses the molecular nature and possible roles of these various germline regulators, and describes a recently discovered mechanism to protect somatic cells from following a germline fate.
Strome
Susan
S
Department of Biology, Indiana University, Bloomington, IN 47405-3700, USA. sstrome@bio.indiana.edu
D000818:Animals; D001757:Blastomeres / Q000166:cytology; D017173:Caenorhabditis elegans / Q000166:cytology* / Q000235:genetics; D029742:Caenorhabditis elegans Proteins / Q000502:physiology; D019070:Cell Lineage; D002843:Chromatin / Q000502:physiology; D003594:Cytoplasmic Granules / Q000502:physiology; D018507:Gene Expression Regulation, Developmental; D005854:Germ Cells / Q000166:cytology*; D018510:RNA, Helminth; D014157:Transcription Factors / Q000502:physiology
D029742:Caenorhabditis elegans Proteins; D002843:Chromatin; C459463:MEP-1 protein, C elegans; D018510:RNA, Helminth; D014157:Transcription Factors