[Lin R] Pop (posterior pharynx defective) phenotype: maternal lethal, causing MS blastomere to adopt the fate of sister blastomere E; resulting embryos have twice the wildtype amount of gut. zu189 isolated in mutator background, probable Tc1 insertion.
[C.elegansII] zu189mut : maternal effect embryonic lethal,no MS-derived pharyngeal cells; MS blastomere adopts the fate of sister blastomere E; resulting embryos have twice the wildtype amount of gut. NA1. Cloned: encodes predicted 487 aa protein with HMG box; antibody stains nuclei of oocytes, early blastomeres. [Lin et al. 1995; JJ]
pop-1 encodes an HMG box-containing protein that is the sole C. elegans member of the TCF/LEF family of transcription factors; in C. elegans, POP-1 functions as a component of the canonical and noncanonical Wnt signaling pathways that are required for cell migrations and binary cell fate decisions associated with asymmetric cell division, respectively; in yeast two-hybrid assays, the POP-1 N-terminal beta-catenin binding domain interacts with BAR-1/beta-catenin as well as with the more divergent beta-catenin, SYS-1; when coexpressed with SYS-1, POP-1 is able to activate transcription from a promoter with TCF binding sites; during development, maternally provided POP-1 is first detected in the nuclei of maturing oocytes and then in nearly all cells of the early embryo; in sister blastomeres in the early embryo, POP-1 is detected at lower levels in posterior blastomeres, such as E and P3, than in corresponding anterior blastomeres, MS and C; in later developmental stages, POP-1 is detected in a subset of tissues including hypodermal seam cells, gonadal precursors, and the developing vulva; in the vulva, POP-1 also exhibits an asymmetric staining pattern, with sister cells showing high or low levels of POP-1 depending upon their orientation along the anterior/posterior axis of the vulva.
Enables several functions, including DNA-binding transcription activator activity, RNA polymerase II-specific; beta-catenin binding activity; and enzyme binding activity. Involved in several processes, including mesodermal cell fate commitment; regulation of cell division; and regulation of gene expression. Located in cytoplasm and nucleus. Expressed in several structures, including ABplpapaaa; ABprpapaaa; oocyte; somatic nervous system; and vulva. Used to study obesity. Human ortholog(s) of this gene implicated in several diseases, including diabetes mellitus (multiple); endocrine gland cancer (multiple); and prostate disease (multiple). Is an ortholog of human TCF7L2 (transcription factor 7 like 2).