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DNA: Too Much - or Too Little - Can Be a Bad Thing

There's more variety to DNA than you might think: Deletions or additions of genetic material between individuals, called copy number variations (CNVs), are a common source of genetic diversity.

Now, preliminary work reported at the American Society of Human Genetics meeting suggests that men who have more CNVs than average may be more likely to sire children with the eye cancer retinoblastoma. The research reflects growing enthusiasm among geneticists for CNVs, a type of genetic variation that hadn't gotten much attention until recently but that's now being linked to a number of diseases.