Nat. Genet. 46, 385–388 (2014); published online 9 March 2014; corrected after print 25 April 2014
In the version of this article initially published, the protein alterations for three cases (COG1770, COG1670 and COG0141) were listed incorrectly in Table 1. The correct protein alterations for these three cases are p.Ile310Asn, p.Ser312fs and p.Gly532Ser, respectively. These errors have been corrected in the HTML and PDF versions of the article.