Skip to main content
eScholarship
Open Access Publications from the University of California

UC San Diego

UC San Diego Previously Published Works bannerUC San Diego

Heritability of brain ventricle volume: converging evidence from inconsistent results.

  • Author(s): Kremen, William S
  • Panizzon, Matthew S
  • Neale, Michael C
  • Fennema-Notestine, Christine
  • Prom-Wormley, Elizabeth
  • Eyler, Lisa T
  • Stevens, Allison
  • Franz, Carol E
  • Lyons, Michael J
  • Grant, Michael D
  • Jak, Amy J
  • Jernigan, Terry L
  • Xian, Hong
  • Fischl, Bruce
  • Thermenos, Heidi W
  • Seidman, Larry J
  • Tsuang, Ming T
  • Dale, Anders M
  • et al.
Abstract

Twin studies generally show great consistency for the heritability of brain structures. Ironically, the lateral ventricles--perhaps the most reliably measured brain regions of interest--are the most inconsistent when it comes to estimating genetic influences on their volume. Heritability estimates in twin studies have ranged from zero to almost 0.80. Here we aggregate heritability estimates from extant twin studies, and we review and reinterpret some of the findings. Based on our revised estimates, we conclude that lateral ventricular volume is indeed heritable. The weighted average heritability of the revised estimates was 0.54. Although accumulated environmental insults might seem most logical as the predominant cause of age-related ventricular expansion, the data strongly suggest that genetic influences on lateral ventricular volume are increasing with age. Genetic influences accounted for 32-35% of the variance in lateral ventricular volume in childhood, but about 75% of the variance in late middle and older age. These conclusions have implications for the basic understanding of the genetic and environmental underpinnings of normative and pathological brain aging.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View