Beta-catenin homolog sys-1

UniProtKB accession:  Q9XVI2

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Transcription coregulator (PubMed:26073017). Part of the Wnt signaling asymmetry pathway, probably acting downstream of putative frizzled ligand mom-2, Wnt/frizzled receptors lin-17 and mom-5, and dishevelled homolog dsh-2 (PubMed:15020416, PubMed:17296929, PubMed:17567664, PubMed:19386265, PubMed:26073017). Activates or represses target gene expression, depending on upstream Wnt signals and interactions with transcription factors, such as pop-1 (PubMed:26073017, PubMed:35660370). Required for the activation of Wnt-responsive genes in the E blastomere; thereby leading to a role in endoderm specification and gut development (PubMed:17296929, PubMed:17567664). Reciprocal distribution patterns of sys-1 and pop-1/TCF in the daughters of anterior-posterior cell divisions functions in specifying cell fate; a higher sys-1 to pop-1 ratio promotes the posterior cell fate, whereas a low sys-1 to pop-1 ratio promotes the anterior fate (PubMed:17296929, PubMed:17567664). Represses expression of homeobox ttx-3 in neuroblasts of the SIAD/SIBV lineage, perhaps acting by blocking its transcriptional activation by a complex consisting of ref-2 and pop-1 (PubMed:26073017). Required for early organization of the hermaphrodite, but not the male, gonad; involved in generation of regulatory cells, known as the distal tip cells (DTC), and in formation of the somatic gonadal primordium (PubMed:11161562, PubMed:15020416, PubMed:17296929, PubMed:35196020). Involved in regulating asymmetric divisions of the somatic gonadal precursor cells (SGP), Z1 and Z4 (PubMed:15020416).