Abstract
In this study, we aimed to determine the genetic basis of a Turkish family related to hereditary spastic paraplegia (HSP) by exome sequencing. HSP is a progressive neurodegenerative disorder and displays genetic and clinical heterogeneity. The major symptoms are muscle weakness and spasticity, especially in the lower extremities. We studied seven affected and seven unaffected family members, as well as a clinically undetermined member, to identify the disease-causing gene. Exome sequencing was performed for four affected and two unaffected individuals. The variants were firstly filtered for HSP-associated genes, and we found a common variant in the ZFYVE27 gene, which has been previously implied for association with HSP. Due to the incompletely penetrant segregation pattern of the ZFYVE27 variant, revealed by Sanger sequencing, with the disease in this family, filtering was re-performed according to the mode of inheritance and allelic frequencies. The resulting 14 rare variants were further evaluated in terms of their cellular functions, and three candidate variants in ATAD3C, VPS16, and MYO1H genes were selected as possible causative variants, which were analyzed for their familial segregation. ATAD3C and VPS16 variants were eliminated due to incomplete penetrance. Eventually, the MYO1H variant NM_001101421.3:c.2972_2974del (p.Glu992del, rs372231088) was found as the possible disease-causing deletion for HSP in this family. This is the first study reporting the possible role of a MYO1H variant in HSP pathogenesis. Further studies on the cellular roles of Myo1h protein are needed to validate the causality of MYO1H gene at the onset of HSP.
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Acknowledgements
This work was supported by Istanbul Technical University BAP 1239-39586 to AK for ES.
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Supplementary Table shows the shared variants (except for the variants on ATAD3C, VSP16, and MYO1H) among the cases who were exome sequenced. The elimination criteria used to determine the causative candidate gene are also given in this table (DOCX 193 kb)
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Selçuk, E., Kırımtay, K., Temizci, B. et al. MYO1H is a novel candidate gene for autosomal dominant pure hereditary spastic paraplegia. Mol Genet Genomics 297, 1141–1150 (2022). https://doi.org/10.1007/s00438-022-01910-5
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DOI: https://doi.org/10.1007/s00438-022-01910-5