Major mutation p.His281Tyr in Gene GLB1 in patients with GM1-gangliosidosis in Ukraine

Abstract

Mutation analysis of gene GLB1 in 26 patients from different regions of Ukraine diagnosed with GM1-gangliosidosis identified 15 pathogenic mutations. The most common was missense mutation p.His281Tyr (c.841C>T) in exon 8, which was found in at least one allele in 16 of 26 patients (61.5%), accounting for 20 of 52 (38.5%) mutant alleles. Mutation p.His281Tyr (c.841C>T) was described in rare cases in patients from Germany, Italy, and Portugal, while no alleles with such a replacement were found in other countries. This may indicate a much higher frequency of this mutation in Ukraine compared to other countries. Analysis of the information about the spatial distribution of the families with mutation p.His281Tyr (c.841C>T) revealed that most of the alleles with this mutation (14 of 20 or 70%) were found in patients from the western regions of the country, which may be due to the founder effect.