Extensive allelic variation and ultrashort telomeres in senescent human cells.

Abstract:

:By imposing a limit on the proliferative lifespan of most somatic cells, telomere erosion represents an innate mechanism for tumor suppression and may contribute to age-related disease. A detailed understanding of the pathways that link shortened telomeres to replicative senescence has been severely hindered by the inability of current methods to analyze telomere dynamics in detail. Here we describe single telomere length analysis (STELA), a PCR-based approach that accurately measures the full spectrum of telomere lengths from individual chromosomes. STELA analysis of human XpYp telomeres in fibroblasts identifies several features of telomere biology. We observe bimodal distributions of telomeres in normal fibroblasts; these distributions result from inter-allelic differences of up to 6.5 kb, indicating that unexpectedly large-scale differences in zygotic telomere length are maintained throughout development. Most telomeres shorten in a gradual fashion consistent with simple losses through end replication, and the rates of erosion are independent of allele size. Superimposed on this are occasional, more substantial changes in length, which may be the consequence of additional mutational mechanisms. Notably, some alleles show almost complete loss of TTAGGG repeats at senescence.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Baird DM,Rowson J,Wynford-Thomas D,Kipling D

doi

10.1038/ng1084

keywords:

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

203-7

issue

2

eissn

1061-4036

issn

1546-1718

pii

ng1084

journal_volume

33

pub_type

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