Longitudinal genetic analysis of brain volumes in normal elderly male twins

Christina N. Lessov-Schlaggar, Jill Hardin, Charles DeCarli, Ruth E. Krasnow, Terry Reed, Philip A. Wolf, Gary E. Swan, Dorit Carmelli

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17 Scopus citations

Abstract

This study investigated the role of genetic and environmental influences on individual differences in brain volumes measured at 2 time points in normal elderly males from the National Heart, Lung, and Blood Institute Twin Study. The magnetic resonance imaging (MRI) scans were conducted 4 years apart on 33 monozygotic and 33 dizygotic male twin pairs, aged 68 to 77 years when first scanned. Volumetric measures of total brain and total cerebrospinal fluid were significantly heritable at baseline (over 70%). For both volumes genetic influences at follow-up were entirely accounted for by genetic influences at baseline, suggesting that the same genetic factors influence variability in brain volume at each time of assessment. Variability in 4-year volume change was due to shared and individual-specific environmental influences. There was little evidence for heritable influences on change measures. These results suggest that variation in longitudinal change of some brain volume measures may have different underlying genetic and environmental architecture from variation in repeat cross-sectional measures, which could have implications for intervention strategies for age-related illness associated with brain morphology. The results of this study are discussed in the context of the small sample size and associated limitations of statistical power.

Original languageEnglish (US)
Pages (from-to)636-644
Number of pages9
JournalNeurobiology of Aging
Volume33
Issue number4
DOIs
StatePublished - Apr 2012

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Keywords

  • Aging
  • Longitudinal
  • Twins
  • Volumetric MRI

ASJC Scopus subject areas

  • Clinical Neurology
  • Neuroscience(all)
  • Aging
  • Developmental Biology
  • Geriatrics and Gerontology

Cite this

Lessov-Schlaggar, C. N., Hardin, J., DeCarli, C., Krasnow, R. E., Reed, T., Wolf, P. A., Swan, G. E., & Carmelli, D. (2012). Longitudinal genetic analysis of brain volumes in normal elderly male twins. Neurobiology of Aging, 33(4), 636-644. https://doi.org/10.1016/j.neurobiolaging.2010.06.002