Nat. Genet. 41, 1110–1115; published online 6 September; corrected online 13 September 2009

In the version of this article initially published online, there were errors in the e-mail addresses of two of the corresponding authors. The correct e-mail address for Robert Sladek is robert.sladek@mcgill.ca; the correct e-mail address for Philippe Froguel is philippe.froguel@good.ibl.fr. These errors have been corrected for all versions of this article.