A Novel Exon Mutation in the Human Beta-hexosaminidase Beta Subunit Gene Affects 3' Splice Site Selection

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 1992 Feb 5

PMID 1531140

Citations 34

Authors

N Wakamatsu

H Kobayashi

T Miyatake

S Tsuji

Affiliations

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Abstract

The molecular basis of a dramatically decreased steady state level of beta-hexosaminidase beta subunit mRNA in a patient with juvenile Sandhoff disease was investigated. Nucleotide sequence analysis of the HEXB gene coding for the beta subunit revealed two single base substitutions, one in exon 2 (A to G, a known polymorphism) and the other in exon 11 (C to T). Analysis of the beta subunit mRNA species demonstrated activation of a cryptic splice site in exon 11 as well as skipping of the exon. A transfection assay using a chimeric gene containing intron 10 flanked by cDNA sequences carrying the mutation confirmed that the single base substitution located at position 8 of exon 11 inhibits the selection of the normal 3' splice site. The results demonstrate a new type of exon mutation affecting 3' splice site selection.

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