Abstract:
:The most common form of chronic granulomatous disease (CGD) is caused by mutations in the CYBB gene that is carried on the X-chromosome and give rise to the X-linked form of the disease. The product of this gene is the large subunit of flavocytochrome b558, gp91phox, the catalytic core of the superoxide-generating enzyme, NADPH oxidase. In the overwhelming majority of cases, mutations are family-specific and occur in the exonic regions of the gene or, less frequently, at the intron/exon borders. In addition, there are large, often multi-gene, deletions. Four mutations have also been found in the promoter regions. In contrast, very few intronic mutations have been reported. Here we describe an unusual intronic mutation that causes CGD. The mutation is the insertion of 12 bp in intron XI, accompanied by the deletion of exon 12. Remarkably, the grandmother of this patient is chimeric, carrying a normal allele, the patient's allele, and an allele with a 4-nucleotide insertion at a site adjacent to the patient's insertion, in combination with a 1.5-kb deletion within intron XI. The patient's mother carries a normal allele and the patient's allele. We propose that an initial mutational event during the grandmother's embryogenesis has undergone unsuccessful DNA repair and has resulted in two aberrant alleles, one of which has been inherited by the patient and his mother. Remarkably, in the only two kindreds that have been examined in detail where deletions originating within introns have led to CGD, both families have contained members with triple somatic mosaicism.
journal_name
Hum Genetjournal_title
Human geneticsauthors
Noack D,Heyworth PG,Kyono W,Cross ARdoi
10.1007/s004390100551keywords:
subject
Has Abstractpub_date
2001-08-01 00:00:00pages
234-8issue
2eissn
0340-6717issn
1432-1203journal_volume
109pub_type
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