Gender and telomere length: systematic review and meta-analysis
Research output: Contribution to journal › Review article › peer-review
Colleges, School and Institutes
- University College London Hospitals NHS Foundation Trust
- Newcastle University
- London School of Hygiene and Tropical Medicine
- University of Glasgow
- University of Southampton
- Second University of Naples
- Ghent University
- University of Southern Denmark
- BC Cancer Agency, Canada's Michael Smith Genome Sciences Centre
- Tulane University Health Sciences, New Orleans, LA, USA.
- University of Edinburgh
- Medical Research Council/Chief Scientist Office Social and Public Health Sciences Unit
- University of Michigan
- Washington State University
- University of Utah
- Kyungpook National University Daegu
- Albert Einstein College of Medicine
- University of Medicine and Dentistry of New Jersey
- University of British Columbia
- Liaoning Medical University
- Kyushu University
- King's Health Partners Cancer Biobank
- University Hospitals Leuven
- University Teaching Hospital Adult Hospital
- Umeå University
- University of Calgary
- University of Groningen
- University of Texas Southwestern Medical Center
- The Chinese University of Hong Kong
BACKGROUND: It is widely believed that females have longer telomeres than males, although results from studies have been contradictory.
METHODS: We carried out a systematic review and meta-analyses to test the hypothesis that in humans, females have longer telomeres than males and that this association becomes stronger with increasing age. Searches were conducted in EMBASE and MEDLINE (by November 2009) and additional datasets were obtained from study investigators. Eligible observational studies measured telomeres for both females and males of any age, had a minimum sample size of 100 and included participants not part of a diseased group. We calculated summary estimates using random-effects meta-analyses. Heterogeneity between studies was investigated using sub-group analysis and meta-regression.
RESULTS: Meta-analyses from 36 cohorts (36,230 participants) showed that on average females had longer telomeres than males (standardised difference in telomere length between females and males 0.090, 95% CI 0.015, 0.166; age-adjusted). There was little evidence that these associations varied by age group (p=1.00) or cell type (p=0.29). However, the size of this difference did vary by measurement methods, with only Southern blot but neither real-time PCR nor Flow-FISH showing a significant difference. This difference was not associated with random measurement error.
CONCLUSIONS: Telomere length is longer in females than males, although this difference was not universally found in studies that did not use Southern blot methods. Further research on explanations for the methodological differences is required.
|Number of pages||13|
|Publication status||Published - 1 Mar 2014|
- Adult, Aged, Aged, 80 and over, Aging/physiology, Female, Humans, Male, Middle Aged, Sex Factors, Telomere/physiology, Gender, Telomere length, Systematic review and meta-analysis, Measurement methods, Epidemiology