Maternal Age Shapes Offspring Through Reversible Epigenetics
Get the Health newsletter
Daily health & science — research, biotech, public health, the studies worth knowing. Free.
- Kristin Gribble and her team at the Marine Biological Laboratory found that maternal age effects in rotifers can be reversed within a single generation, arguing against the prevailing theory that DNA mutation accumulation drives the phenomenon.
- The research, published in The American Naturalist and led by postdoctoral scientist Alyssa Liguori (now an assistant professor at SUNY-New Paltz), examined two different rotifer genotypes and found effects did not grow progressively stronger across generations.
- The findings point to histone modifications—epigenetic changes that influence whether genes are switched on or off—rather than alterations to the underlying DNA sequence as the mechanism behind maternal age effects.
- In one rotifer strain, offspring from older mothers had longer lifespans, suggesting that genetic variants can buffer or even reverse negative maternal age effects rather than uniformly harming offspring.
- Gribble is also investigating whether mitochondrial DNA, which is generally inherited from the mother, could play a role in transmitting information about maternal age to offspring.
- Maternal age effects appear across nearly all animal species—from invertebrates to humans, elephants, and other primates—yet persist despite reducing evolutionary fitness, possibly because selective pressure weakens at advanced ages when most reproduction has already occurred.
Why it matters: If maternal age effects are driven by reversible epigenetic marks rather than accumulating DNA damage, future interventions could theoretically target histone modifications to improve outcomes for offspring of older mothers. The research also implies that an individual's biology may reflect not just inherited DNA but the health and environment of grandmothers and great-grandmothers—a finding with direct implications for precision medicine and understanding intergenerational disease risk.
Ask SkimNews
