NGLY1-CDDG: report of two cases from India and brief review of literature

N-glycanase1 (NGLY1) deficiency, an autosomal recessive disorder identified a decade ago, is categorized as a congenital disorder of deglycosylation (CDDG). This disorder arises from bi-allelic variants in the NGLY1 gene, leading to impaired protein deglycosylation. Phenotypically, individuals with NGLY1 deficiency present with intellectual disability, movement disorders, liver dysfunction, muscular hypotonia, etc., termed as NGLY1-CDDG, its diagnosis relies primarily on next generation sequencing (NGS) and till date, it has been diagnosed in over 100 patients. However, there are no previous reports on this from India. We report the first two NGLY1 cases from India in this study.