Genetic analysis of Xp22.3 micro-deletions in seventeen families segregating isolated form of X-linked ichthyosis

•We presented the first report of Xp22.3 micro-deletions underlying isolated XLI in seventeen familial cases representing major ethnic groups living in Pakistan.•Four distinct micro deletions ∼1.67 Mb, ∼1.62 Mb, ∼1.24 Mb and ∼1.23 Mb were identified in genetic analysis.•SNP array fine mapped the breakpoints of two most prevalent micro-deletions at Xp22.3•A rare genetic finding of homozygous micro-deletion in two affected sisters with profound cutaneous scaling.