RRC ID 3620
Author Smith PA, Mango SE.
Title Role of T-box gene tbx-2 for anterior foregut muscle development in C. elegans.
Journal Dev Biol
Abstract During organogenesis, pluripotent precursor cells acquire a defined identity such as muscle or nerve. The transition from naïve precursor towards the differentiated state is characterized by sequential waves of gene expression that are determined by regulatory transcription factors. A key question is how transcriptional circuitry dictates the succession of events that accompanies developmental competence, cell fate specification and differentiation. To address this question, we have examined how anterior muscles are established within the Caenorhabditis elegans foregut (pharynx). We find that the T-box transcription factor tbx-2 is essential to form anterior pharyngeal muscles from the ABa blastomere. In the absence of tbx-2 function, ABa-derived cells initiate development normally: they receive glp-1/Notch signaling cues, activate the T-box gene TBX-38 and express the organ selector gene PHA-4/FoxA. However, these cells subsequently arrest development, extinguish PHA-4 and fail to activate PHA-4 target genes. tbx-2 mutant cells do not undergo apoptosis and there is no evidence for adoption of an alternative fate. TBX-2 is expressed in ABa descendants and depends on activation by pha-4 and repression by components of glp-1/Notch signaling. Our analysis suggests that a positive feedback loop between tbx-2 and pha-4 is required for ABa-derived precursors to commit to pharyngeal muscle fate.
Volume 302(1)
Pages 25-39
Published 2007-2-1
DOI 10.1016/j.ydbio.2006.08.023
PII S0012-1606(06)01076-1
PMID 17005176
PMC PMC1852510
MeSH Amino Acid Sequence Animals Caenorhabditis elegans / embryology* Caenorhabditis elegans / genetics Caenorhabditis elegans Proteins / chemistry Caenorhabditis elegans Proteins / genetics* Caenorhabditis elegans Proteins / metabolism* Cell Nucleus / chemistry Cytoplasm / chemistry Digestive System / embryology Gene Expression Regulation, Developmental* Green Fluorescent Proteins / genetics Molecular Sequence Data Muscle Development / genetics Muscles / embryology* Muscles / metabolism Sequence Alignment Trans-Activators / metabolism Transcription Factors / chemistry Transcription Factors / genetics* Transcription Factors / metabolism*
IF 2.936
Times Cited 30
C.elegans tm478