Ky, located on chromosome 3, encodes Kyphoscoliosis Peptidase, a transglutaminase-like protein in skeletal muscles. It is primarily involved in the formation and stabilization of neuromuscular intersections, being essential for the development of the musculoskeletal system. Mutations in KY are associated with Myofibrillar Myopathy-7 (MFM-7) and Hereditary Spastic Paraplegia (HSP) [1].

In an Iranian family, a homozygous novel variant (NM_178554.6:c.1247T > A, p. Ile416Asn) in KY was identified in two MFM-7 patients born to consanguineous parents, with their parents having the same heterozygous mutation. The patients showed muscle weakness, atrophy, mobility restriction, and hyporeflexia. This discovery reveals how mutations in KY can lead to MFM-7, an early-onset muscle disorder with autosomal recessive inheritance, marked by progressive muscle weakness and joint contractures [1].

In conclusion, Ky is crucial for the development of the musculoskeletal system through its role in neuromuscular intersection formation and stabilization. The identification of KY mutations in MFM-7 patients provides insights into the genetic basis of this muscle disorder, highlighting the importance of studying KY in understanding the mechanisms of MFM-7 and potentially other related diseases [1].