A novel homozygous KY variant causing a complex neurological disorder

Area of Science:

• Genetics
• Neurology
• Molecular Biology

Background:

• Mutations in the kyphoscoliosis peptidase (KY) gene are associated with myofibrillar myopathy-7 and hereditary spastic paraplegia.
• The genetic basis for a complex neurological phenotype in a consanguineous Pakistani family remained uncharacterized.

Observation:

• Affected family members presented with lower limb spasticity, weakness, toe walking, pes equinovarus, and speech disorder.
• Genome-wide linkage analysis localized the disease gene to chromosome 3q22.2-q24.
• Whole exome sequencing identified a novel homozygous 14-bp frameshift deletion (c.842_855del; p.Val281GlyfsTer18) in the KY gene.

Findings:

• The identified homozygous KY variant segregated with the complex neurological phenotype within the family.
• The variant was absent in ethnically matched controls and public databases, confirming its novelty.
• This discovery establishes a new KY gene mutation responsible for a complex neurological disorder.

Implications:

• This research expands the genotypic and phenotypic spectrum associated with kyphoscoliosis peptidase (KY) gene mutations.
• The findings contribute to understanding the genetic etiology of rare neurological disorders.
• Further research into KY gene function may reveal therapeutic targets for related myopathies and spastic paraplegias.