Unclassified COL6A1 Variant in a Child With Congenital Hypotonia: A Case Report.

We report a 3-year-old male with congenital hypotonia, proximal contractures, and distal hyperlaxity. Exome sequencing identified a novel homozygous COL6A1 variant (c.2821C>T), classified as a variant of uncertain significance. The distinct phenotype strongly supports Ullrich congenital muscular dystrophy, expanding the gene's mutational spectrum in consanguineous populations.