Genes & Cells

The genes for caffeine cravings, plus rare variants and shaping eyes in this week’s news

Rare variants, not common, cause disease
Strike another blow against the idea that common genetic variants cause common diseases like diabetes and heart disease. An analysis of the complete genetic makeup of 29 people shows that common variants usually don’t alter proteins or gene activity, because most common variants are not located within genes or gene-control regions, say researchers led by David B.