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Title: Four novel and three recurrent mutations of the BTK gene and pathogenic effects of putative splice mutations
Authors: Duangrurdee Wattanasirichaigoon
Suwat Benjaponpitak
Chonnamet Techasaensiri
Wasu Kamchaisatian
Pakit Vichyanond
Sucheela Janwityanujit
Lulin Choubtum
Sayomporn Sirinavin
Mahidol University
Keywords: Biochemistry, Genetics and Molecular Biology;Medicine
Issue Date: 1-Nov-2006
Citation: Journal of Human Genetics. Vol.51, No.11 (2006), 1006-1014
Abstract: X-linked agammaglobulinemia is caused by mutations in the human BTK gene, leading to recurrent pyogenic infections. We describe four novel and three known BTK-mutations in seven patients from seven (six Thai and one Burmese) families. All but one were sporadic cases. Patients 1 and 2 had recurrent mutations in exon 10 (R288W) and exon 17 (R562W), respectively. Patient 3, a previously healthy individual who presented with pseudomonas sepsis with ecthyma gangrenosum had a known mutation in exon 17 (1749delT), leading to frameshift effect (F583fsX586). Patient 4 manifested with sepsis and concurrent acute appendicitis and pneumonia. He had a mutation, IVS8 + 1G > A, which led to an insertion of intron 8 into the transcripts. In Patient 5, a novel change in exon 7, c.588G > C, initially presumed Q196H, was found to cause a leaky splicing mutation, resulting in three distinct transcripts containing 17, 108, and 190 bp of the 5′-terminal of intron 7, which led to truncated peptides consisting of 203 and 211 amino acid residues (or Q196fsX204 and Q196fsX212, respectively). Patient 6 had a mutation in exon 14 (W421X), while patient 7 had a newly defined large deletion of exons 6-9. All of the mothers tested were mutation carriers. Transcript analysis in three mothers who were heterozygous for frameshift mutations revealed a minimal amount of aberrant transcripts, while their affected children had full expression of the mutant alleles, suggesting rapid degradation due to nonsense-mediated mRNA decay in the mothers. This is the first report of mutations of BTK from Thailand. © 2006 The Japan Society of Human Genetics and Springer.
ISSN: 14345161
Appears in Collections:Scopus 2006-2010

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