A novel mutation deep within intron 7 of the GBA gene causes Gaucher disease

被引:11
|
作者
Malekkou, Anna [1 ,2 ]
Sevastou, Ioanna [1 ,6 ,7 ]
Mavrikiou, Gavriella [1 ]
Georgiou, Theodoros [1 ,2 ]
Vilageliu, Lluisa [3 ]
Moraitou, Marina [4 ]
Michelakakis, Helen [4 ]
Prokopiou, Chrystalla [5 ]
Drousiotou, Anthi [1 ,2 ]
机构
[1] Cyprus Inst Neurol & Genet, Dept Biochem Genet, Nicosia, Cyprus
[2] Cyprus Sch Mol Med, Nicosia, Cyprus
[3] Univ Barcelona, Dept Genet, IBUB, CIBERER,Fac Biol, Barcelona, Spain
[4] Inst Child Hlth, Dept Enzymol & Cellular Funct, Athens, Greece
[5] Limassol Gen Hosp, Dept Haematol, Limassol, Cyprus
[6] UCL Queen Sq Inst Neurol, Reta Lila Weston Inst, London, England
[7] UCL Queen Sq Inst Neurol, Dept Clin & Movement Neurosci, London, England
来源
MOLECULAR GENETICS & GENOMIC MEDICINE | 2020年 / 8卷 / 03期
关键词
Cypriot; deep intronic mutation; Gaucher disease; GBA; glucocerebrosidase; HUMAN GLUCOCEREBROSIDASE GENE; IDENTIFICATION; DEFICIENCY; SEQUENCE;
D O I
10.1002/mgg3.1090
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Background Mutations in the GBA gene that encodes the lysosomal enzyme acid beta-glucocerebrosidase cause Gaucher disease (GD), the most common lysosomal storage disorder. Most of the mutations are missense/nonsense, however, a few splicing mutations within or close to conserved consensus donor or acceptor splice sites have also been described. The aim of the study was to identify the mutation(s) in a Cypriot patient with type I GD. Methods The genomic DNA of the proband was screened for nine common mutations using Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis. All exons and exon-intron boundaries, and the 5'UTR and 3'UTR regions of the GBA gene, were investigated by Sanger sequencing. RNA analysis was performed using standard procedures, and the abnormal transcript was further cloned into pGEM-T-Easy plasmid vector and sequenced. The relevant intronic region was further sequenced by the Sanger method to identify the genetic variant. Results A novel point mutation, g.12599C > A (c.999 + 242C > A), was detected deep in intron 7 of the GBA gene. This type of mutation has been previously described for other diseases but this is the first time, as far as we know, that it is described for GD. This mutation creates a new donor splice site leading to aberrant splicing and resulting in the insertion of the first 239nt of intron 7 as a pseudoexon in the mRNA, creating a premature stop codon. Conclusion This study expands the mutation spectrum of GD and highlights the importance of RNA sequencing for the molecular diagnosis of patients bearing mutations in nonexonic regions.
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页数:6
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