TERT promotes epithelial proliferation through transcriptional control of a Myc- and Wnt-related developmental program.

PLoS Genetics
Jinkuk ChoiSteven E Artandi

Abstract

Telomerase serves a critical role in stem cell function and tissue homeostasis. This role depends on its ability to synthesize telomere repeats in a manner dependent on the reverse transcriptase (RT) function of its protein component telomerase RT (TERT), as well as on a novel pathway whose mechanism is poorly understood. Here, we use a TERT mutant lacking RT function (TERT(ci)) to study the mechanism of TERT action in mammalian skin, an ideal tissue for studying progenitor cell biology. We show that TERT(ci) retains the full activities of wild-type TERT in enhancing keratinocyte proliferation in skin and in activating resting hair follicle stem cells, which triggers initiation of a new hair follicle growth phase and promotes hair synthesis. To understand the nature of this RT-independent function for TERT, we studied the genome-wide transcriptional response to acute changes in TERT levels in mouse skin. We find that TERT facilitates activation of progenitor cells in the skin and hair follicle by triggering a rapid change in gene expression that significantly overlaps the program controlling natural hair follicle cycling in wild-type mice. Statistical comparisons to other microarray gene sets using pattern-matching algorithms r...Continue Reading

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Datasets Mentioned

BETA
GSE9725

Methods Mentioned

BETA
transgenic
biopsies
PCR

Software Mentioned

ImageJ
Affymetrix MAS
Gene Set Enrichment Analysis ( GSEA )
PerlPrimer
GSEA
dChip

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