In Rats, Dad’s Cocaine Use Affects Son’s Spatial Memory

July 14, 2016 · Posted in Genetics, Neurobiology · Comment 

cocaine use affects offspring's spatial memory

Evidence is mounting that certain behaviors by parents can leave marks on their sperm or eggs that are passed on to their offspring in a process called epigenetics. In a recent study by researcher Mathieu Wimmer and colleagues, male rats that were exposed to cocaine for 60 days (the time it takes for sperm to develop fully) had male offspring who showed diminished short- and long-term spatial memory compared to the offspring of male rats that were not exposed to cocaine. Female offspring were not affected in this way.

The spatial tasks the offspring rats completed depended heavily on the hippocampus. Wimmer and colleagues believe that cocaine use in the fathers decreased the amount of a brain chemical called d-serine in the offspring. D-serine plays a role in memory formation and the brain’s ability to form synaptic connections. Injecting the offspring of rats who were exposed to cocaine with d-serine before the spatial memory tasks normalized the rats’ performance.

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