Telomere length in Hutchinson-Gilford progeria syndrome.
Hutchinson-Gilford Progeria Syndrome (HGPS) is a rare premature aging disorder caused by mutations in the gene LMNA, which encodes the nuclear matrix protein lamin A. Previous research has shown that the average telomere length in fibroblasts from HGPS patients is shorter than in age-matched controls. How mutations in lamin A lead to shortened telomere lengths is not known nor is the contribution of individual chromosome ends to the low average length understood. To measure the telomere length of individual chromosomes, we used quantitative fluorescence in situ hybridization (Q-FISH). In agreement with previous studies, we found that the average telomere length in HPGS fibroblasts is greatly reduced; however, the telomere length at chromosome ends was variable. In contrast, the telomere length in hematopoietic cells which typically do not express lamin A, was within the normal range for three out of four HGPS patient samples. Our results suggest that mutant lamin A decreases telomere length via a direct effect and that expression of mutant LMNA is necessary for telomere loss in HGPS.
Terry Fox Laboratory, British Columbia Cancer Agency, 675 West 10th Avenue, Vancouver, BC, Canada.
Michelle L
ML
Decker
Elizabeth
E
Chavez
Irma
I
Vulto
Peter M
PM
Lansdorp
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D002460:Cell Line; D002648:Child; D002675:Child, Preschool; D005347:Fibroblasts / Q000378:metabolism*; D006098:Granulocytes / Q000378:metabolism; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D007231:Infant, Newborn; D034904:Lamin Type A / Q000235:genetics*; D008875:Middle Aged; D009154:Mutation; D011371:Progeria / Q000235:genetics*; D013601:T-Lymphocytes / Q000378:metabolism; D016615:Telomere / Q000378:metabolism*; D055815:Young Adult
D034904:Lamin Type A