Pediatric bi-polar disorder related to faulty body clock

Researchers have found that 4 alleles of one gene are associated with pediatric bi-polar disorder. The gene's expression is known to vary with a circadian rhythm, and apparently whether a kid has circadian rhythm abnormalities is an early way to distinguish bi-polar from ADHD, so this gene is a good candidate for further research into both circadian rhythms and bi-polar disorder.

Just think, it was only a generation or so ago that we blamed mothers for what we now know are biological phenomena.