“…ISCBI guidelines (ISCBI, 2009) for release criteria of banked lines are based on best practices in clinical cytogenetics and recommend G-banding (Bickmore, 2001;Loring et al, 2007) and counting at least 20 metaphase spreads with greater than 95% of the cells confirmed to possess normal karyotype. Recent studies have employed higher resolution analyses, such as comparative genome hybridization (CGH) microarrays, single nucleotide polymorphism (SNP) arrays and whole genome sequencing (Cheng et al, 2012;Elliott et al, 2010Elliott et al, , 2012Gore et al, 2011;Hussein et al, 2011;Maitra et al, 2005;Martins-Taylor et al, 2011). Next-generation sequencing can be used to achieve nucleotide level resolution.…”