title: Telomerase activity is widespread in adult somatic tissues of Xenopus.
abstract: Chromosome ends, or telomeres, are maintained by telomerase. Work in selected vertebrates has implied that telomerase is often repressed in differentiated cells, and telomere erosion results in senescence of cultured cells. Tissues from mature Xenopus laevis frogs were examined for telomerase enzymatic activity with the TRAP (telomere repeat amplification protocol) assay. All tissues contained active telomerase, most abundantly in testis, spleen, liver, and embryos; activity was less abundant but still readily detectable with < 100 ng of protein extract from brain and muscle tissues. Activity in somatic tissues of the diploid Xenopus tropicalis suggests this condition is not limited to the polyploid members of the genus, and that extensive differentiation-linked telomerase repression does not occur in Xenopus.
authors.affiliation: Kleinholz Biological Laboratories, Department of Biology, Reed College, Portland, Oregon 97202, USA.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Bousman
authors.forename: Gerard
authors.initials: G
authors.lastname: Schneider
authors.forename: Janis
authors.initials: J
authors.lastname: Shampay
mesh_terms: D000375:Aging; D000818:Animals; D001921:Brain / Q000201:enzymology; D004625:Embryo, Nonmammalian / Q000201:enzymology; D005260:Female; D008099:Liver / Q000201:enzymology; D008168:Lung / Q000201:enzymology; D008297:Male; D018482:Muscle, Skeletal / Q000201:enzymology; D009928:Organ Specificity; D013154:Spleen / Q000201:enzymology; D019098:Telomerase / Q000032:analysis* / Q000378:metabolism*; D013737:Testis / Q000201:enzymology; D014981:Xenopus / Q000378:metabolism*
chemical_list: D019098:Telomerase