Genomics, The Hospital for Sick Children (Toronto, Canada) using the Agilent
SureSelect Human All Exon V4 Kit (Agilent Technologies) and SOLiD 5500xl platform
(Applied Biosystems). All data were aligned to the hg19/GRCh37 reference genome build
via BFAST and BWA aligner. Variants were quality trimmed using the Genome Analysis Toolkit (GATK 1.1.28) and they
were annotated for functional effect by SnpEff
2.0.5. SnpEff also provided a simple assessment of the putative impact of the variant
(e.g. High, Moderate, or Low impact). Alignment, calling and annotation of the
variants against databases such as 1000 Genomes (April 2012 release), NHLBI Exome Sequencing Project (ESP6500) and
Single Nucleotide Polymorphism database (dbSNP137) were done using a software
developed in-house called Mendel,MD (Cardenas et al., 2015 ). The prediction software SIFT (Sorting Intolerant From Tolerant) was used
in order to estimate whether a given amino acid substitution affected protein
function. SIFT prediction is based on the degree of conservation of amino acid
residues in sequence alignments derived from closely related sequences and on the
physical properties of amino acids.