1. Neuroimaging to Genotype: Delineating the Spectrum of Disorders With Deficient Myelination in the Indian Population.
- Author
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Kaur N, do Rosario MC, Majethia P, Mascarenhas S, Rao LP, Nair KV, Hunakunti B, Prasannakumar AP, Naik R, Narayanan DL, Nayak SS, Bhat V, Sharma S, Ramesh Bhat Y, Yatheesha BL, Kulkarni R, Patil SJ, Nampoothiri S, Siddiqui S, Girisha KM, Bielas S, and Shukla A
- Abstract
Several genetic disorders are associated with either a permanent deficit or a delay in central nervous system myelination. We investigated 24 unrelated families (25 individuals) with deficient myelination after clinical and radiological evaluation. A combinatorial approach of targeting and/or genomic testing was employed. Molecular diagnosis was achieved in 22 out of 24 families (92%). Four families (4/9, 44%) were diagnosed with targeted testing and 18 families (18/23, 78%) were diagnosed using broad genomic testing. Overall, 14 monogenic disorders were identified. Twenty disease-causing variants were identified in 14 genes including PLP1, GJC2, POLR1C, TUBB4A, UFM1, NKX6-2, DEGS1, RNASEH2C, HEXA, ATP7A, SETBP1, GRIN2B, OCLN, and ZBTB18. Among these, nine (45%) variants are novel. Fourteen families (82%, 14/17) were diagnosed using proband-only exome sequencing (ES) complemented with deep phenotyping, thus highlighting the utility of singleton ES as a valuable diagnostic tool for identifying these disorders in resource-limited settings., (© 2024 Wiley Periodicals LLC.)
- Published
- 2024
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