A single-cell assay for telomere DNA content shows increasing telomere length heterogeneity, as well as increasing mean telomere length in human spermatozoa with advancing age.
J Assist Reprod Genet
; 32(11): 1685-90, 2015 Nov.
Article
in En
| MEDLINE
| ID: mdl-26411311
ABSTRACT
PURPOSE:
The effect of age on telomere length heterogeneity in men has not been studied previously. Our aims were to determine the relationship between variation in sperm telomere length (STL), men's age, and semen parameters in spermatozoa from men undergoing in vitro fertilization (IVF) treatment.METHODS:
To perform this prospective cross-sectional pilot study, telomere length was estimated in 200 individual spermatozoa from men undergoing IVF treatment at the NYU Fertility Center. A novel single-cell telomere content assay (SCT-pqPCR) measured telomere length in individual spermatozoa.RESULTS:
Telomere length among individual spermatozoa within an ejaculate varies markedly and increases with age. Older men not only have longer STL but also have more variable STL compared to younger men. STL from samples with normal semen parameters was significantly longer than that from samples with abnormal parameters, but STL did not differ between spermatozoa with normal versus abnormal morphology.CONCLUSION:
The marked increase in STL heterogeneity as men age is consistent with a role for ALT during spermatogenesis. No data have yet reported the effect of age on STL heterogeneity. Based on these results, future studies should expand this modest sample size to search for molecular evidence of ALT in human testes during spermatogenesis.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Spermatozoa
/
DNA
/
Telomere
/
Single-Cell Analysis
Type of study:
Observational_studies
/
Prevalence_studies
/
Risk_factors_studies
Limits:
Adult
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
J Assist Reprod Genet
Journal subject:
GENETICA
/
MEDICINA REPRODUTIVA
Year:
2015
Document type:
Article
Affiliation country:
Estados Unidos