Researchers Identify Cd99l2 Gene As A Cause Of Spastic Ataxia

Despite modern high-throughput sequencing, nan familial origin of astir uncommon activity disorders remains unclear. A investigation squad successful Bochum and Tübingen has now solved 1 portion of nan puzzle: The researchers examined 2,811 patients pinch ataxia, hereditary spastic paraplegia, and dystonia and identified disease-causing variants of nan cistron CD99L2 as nan origin of X-linked spastic ataxia. The findings were published successful Nature Communications connected February 14, 2026.

Cooperation partners

Genetic study of nan ample diligent cohort was conducted successful Tübingen nether nan supervision of Dr. Tobias Haack. Functional characterization of nan recently identified illness cistron was led by Dr. Jonasz Weber's squad astatine nan Department of Human Genetics astatine Ruhr University Bochum.

A cistron pinch a antecedently chartless neurological function

CD99L2 was chiefly known for its functions successful nan immune system, but nary domiciled successful nan nervous system had antecedently been described. Only by combining genome-wide study pinch cellular biologic experiments were nan researchers capable to show that nan cistron plays a cardinal domiciled successful neuronal awesome pathways.

The researchers successful Bochum demonstrated that nan macromolecule coded by CD99L2 acts arsenic an activating partner for nan calcium-dependent protease CAPN1, a known illness macromolecule successful spastic paraplegia and ataxia. "Disease-causing variants lead to disrupted accumulation of nan CD99L2 macromolecule successful nan compartment and forestall its relationship pinch CAPN1," explains Dr. Jonasz Weber. "Patients' cells besides showed circumstantial disruptions of synaptic processes." The reduced CAPN1 activation and nan resulting dysregulation of neuronal awesome pathways plausibly explicate nan observed symptoms.

Our results show that familial diagnostics and functional neuroscience are not mutually exclusive areas. Only erstwhile some disciplines activity intimately together tin a reliable illness system beryllium derived from a familial variant."

Dr. Jonasz Weber, Department of Human Genetics, Ruhr University Bochum

The recognition of CD99L2 as a caller illness cistron not only improves familial diagnostics for uncommon activity disorders, but besides provides caller insights into basal neurodegenerative mechanisms.

Spastic ataxia

Spastic ataxia refers to uncommon neurodegenerative diseases successful which disturbances of activity coordination (ataxia) hap successful operation pinch spastic paralysis. Symptoms originate owed to nan engagement of nan cerebellum and centrifugal pathways successful nan cardinal tense system. The onset and people of nan illness alteration depending connected nan familial cause.