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A novel homozygous KY variant causing a complex neurological disorder


Mutations in the gene kyphoscoliosis peptidase (KY) are known to cause myofibrillar myopathy-7 and hereditary spastic paraplegia. We investigated the genetic cause of a complex neurological phenotype in a consanguineous Pakistani family with four affected members, manifesting lower limb spasticity and weakness, toe walking, pes equinovarus, and a speech disorder. Genome-wide linkage analysis with microsatellite markers delineated chromosome 3q22.2-q24 harboring the disease gene. Whole exome sequencing was performed for two subjects, identifying a homozygous 14-bp frameshift deletion NM_178554.6:c.842_855del; p(Val281GlyfsTer18) in KY. The variant segregated with the phenotype and was absent from public databases and 100 ethnically matched controls. We confirm a novel homozygous KY variant causing a complex neurological phenotype in this family. A review of previously reported KY variants suggests that variants in this gene can cause a spectrum of neurological phenotypes.

Type Journal
ISBN 1769-7212
Authors Arif, B.; Rasheed, A.; Kumar, K.R.; Fatima, A.; Abbas, G.; Wohler, E.; Sobriera, N.; Lohmann, K.; Naz, S.
Responsible Garvan Author Dr Kishore Kumar
Publisher Name European Journal of Medical Genetics
Published Date 2020-11-30
Published Volume 63
Published Issue 11
Published Pages 104031
Status Published in-print
URL link to publisher's version