sciencehabit writes "The cancer gene BRCA1, which keeps tumors in the breast and ovaries at bay by producing proteins that repair damaged DNA, may also regulate brain size. Mice carrying a mutated copy of the gene have 10-fold fewer neurons and had other brain abnormalities, a new study (abstract) suggests. Such dramatic effects on brain size and function are unlikely in human carriers of BRCA1 mutations, the authors of the study note, but they propose the findings could shed light on the gene's role in brain evolution."
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