Short Telomeres, even in the Presence of Telomerase, Limit Tissue Renewal Capacity

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Title: Short Telomeres, even in the Presence of Telomerase, Limit Tissue Renewal Capacity
Author: Greider, Carol W.; Huso, David; Feldser, David M.; Karim, Baktiar; Strong, Margaret A.; Armanios, Mary; Hao, Ling-Yang
Abstract: Autosomal-dominant dyskeratosis congenita is associated with heterozygous mutations in telomerase. To examine the dosage effect of telomerase, we generated a line of mTR+/ÿ mice on the CAST/EiJ background, which has short telomeres. Interbreeding of heterozygotes resulted in progressive telomere shortening, indicating that limiting telomerase compromises telomere mainte- nance. In later-generation heterozygotes, we observed a decrease in tissue renewal capacity in the bone marrow, intestines, and testes that resembled defects seen in dyskeratosis congenita patients. The pro- gressive worsening of disease with decreasing telomere length suggests that short telo- meres, not telomerase level, cause stem cell failure. Further, wild-type mice derived from the late-generation heterozygous parents, termed wt*, also had short telomeres and displayed a germ cell defect, indicating that telomere length determines these phenotypes. We propose that short telomeres in mice that have normal telomerase levels can cause an occult form of genetic disease.
URI: http://jhir.library.jhu.edu/handle/1774.2/33664
Date: 2005-12-16
Citation: Reprinted from Cell 123 (6), Hao, Ling-Yang, et al. "Short Telomeres, even in the Presence of Telomerase, Limit Tissue Renewal Capacity" (2005 Dec. 16): 1121-1131 with permission from Elsevier. Original article: http://www.cell.com
Subject: Testis/pathology
Telomerase/genetics
Intestines/pathology

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