DNA was extracted from blood cells using a FlexiGene DNA kit (Qiagen, Valencia, USA). Exome sequences were collected according to previously described procedures [15 (link)]. Briefly, genomic DNA was fragmented using a Covaris II system (Covaris, Woburn, MA, USA). Exon templates were isolated using the TruSeq Exome Enrichment Kit (Illumina, San Diego, CA, USA) and exome sequences were collected in a HiSeq2500 sequencer (paired-end 2×150) at 100x coverage. The total variants called from the exome data from this study have been deposited in DRYAD Digital Repository with accession ID: doi:10.5061/dryad.p236p.
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