Pam Factor-Litvak1, Ezra Susser2, Katrina Kezios1, Ian McKeague3, Jeremy D Kark4, Matthew Hoffman5, Masayuki Kimura6, Ronald Wapner7, Abraham Aviv8. 1. Departments of Epidemiology, and. 2. Departments of Epidemiology, and New York State Psychiatric Institute, New York, New York; 3. Biostatistics, Mailman School of Public Health, Columbia University, New York, New York; 4. Hebrew University, Hadassah School of Public Health and Community Medicine, Jerusalem, Israel; 5. Department of Obstetrics and Gynecology, Christiana Care Health System, Newark, Delaware; 6. The Center of Human Development and Aging, New Jersey Medical School, Rutgers University, Newark, New Jersey; and. 7. Department of Obstetrics and Gynecology, College of Physicians and Surgeons, Columbia University, New York, New York. 8. The Center of Human Development and Aging, New Jersey Medical School, Rutgers University, Newark, New Jersey; and avivab@njms.rutgers.edu.
Abstract
BACKGROUND AND OBJECTIVE: In adults, leukocyte telomere length (LTL) is variable, familial, and longer in women and in offspring conceived by older fathers. Although short LTL is associated with atherosclerotic cardiovascular disease, long LTL is associated with major cancers. The prevailing notion is that LTL is a "telomeric clock," whose movement (expressed in LTL attrition) reflects the pace of aging. Accordingly, individuals with short LTL are considered to be biologically older than their peers. Recent studies suggest that LTL is largely determined before adulthood. We examined whether factors that largely characterize LTL in adults also influence LTL in newborns. METHODS: LTL was measured in blood samples from 490 newborns and their parents. RESULTS: LTL (mean ± SD) was longer (9.50 ± 0.70 kb) in newborns than in their mothers (7.92 ± 0.67 kb) and fathers (7.70 ± 0.71 kb) (both P < .0001); there was no difference in the variance of LTL among the 3 groups. Newborn LTL correlated more strongly with age-adjusted LTL in mothers (r = 0.47; P < .01) than in fathers (r = 0.36; P < .01) (P for interaction = .02). Newborn LTL was longer by 0.144 kb in girls than in boys (P = .02), and LTL was longer by 0.175 kb in mothers than in fathers (P < .0001). For each 1-year increase in father's age, newborn LTL increased by 0.016 kb (95% confidence interval: 0.04 to 0.28) (P = .0086). CONCLUSIONS: The large LTL variation across newborns challenges the telomeric clock model. Having inherently short or long LTL may be largely determined at birth, anteceding by decades disease manifestation in adults.
BACKGROUND AND OBJECTIVE: In adults, leukocyte telomere length (LTL) is variable, familial, and longer in women and in offspring conceived by older fathers. Although short LTL is associated with atherosclerotic cardiovascular disease, long LTL is associated with major cancers. The prevailing notion is that LTL is a "telomeric clock," whose movement (expressed in LTL attrition) reflects the pace of aging. Accordingly, individuals with short LTL are considered to be biologically older than their peers. Recent studies suggest that LTL is largely determined before adulthood. We examined whether factors that largely characterize LTL in adults also influence LTL in newborns. METHODS: LTL was measured in blood samples from 490 newborns and their parents. RESULTS: LTL (mean ± SD) was longer (9.50 ± 0.70 kb) in newborns than in their mothers (7.92 ± 0.67 kb) and fathers (7.70 ± 0.71 kb) (both P < .0001); there was no difference in the variance of LTL among the 3 groups. Newborn LTL correlated more strongly with age-adjusted LTL in mothers (r = 0.47; P < .01) than in fathers (r = 0.36; P < .01) (P for interaction = .02). Newborn LTL was longer by 0.144 kb in girls than in boys (P = .02), and LTL was longer by 0.175 kb in mothers than in fathers (P < .0001). For each 1-year increase in father's age, newborn LTL increased by 0.016 kb (95% confidence interval: 0.04 to 0.28) (P = .0086). CONCLUSIONS: The large LTL variation across newborns challenges the telomeric clock model. Having inherently short or long LTL may be largely determined at birth, anteceding by decades disease manifestation in adults.
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