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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
REVIEW
Molecular basis of hereditary fructose intolerance: mutations and polymorphisms in the human aldolase B gene.
Human Mutation 1995
Mutations in the human aldolase B gene that result in hereditary fructose intolerance have been characterized extensively. Although the majority of subjects have been from northern Europe, subjects from other geographical regions and ethnic groups have been identified. At present 21 mutations have been reported; 15 of these are single base substitutions, resulting in nine amino acid replacements, four nonsense codons, and two putative splicing defects. Two large deletions, two four-base deletions, a single-base deletion, and a seven-base deletion/one-base insertion have been found. This last mutation leads to a defect in splicing and it is likely that one of the small deletions does as well. Regions of the enzyme where mutations have been observed recurrently are encoded by exons 5 and 9. Indeed, the three most common mutations are found in these exons. Two of these prevalent HFI mutations arose from a common ancestor and spread throughout the population by genetic drift. This finding was based on linkage to two sequence polymorphisms, which are among very few informative polymorphic markers that have been identified within the aldolase B gene. Because of the prevalence of a few HFI alleles, and the recent advances in molecular methods for identifying and screening for mutation, the diagnosis of HFI by molecular screening methods should become routine. These molecular diagnostic methods will be extremely beneficial for this often difficult to diagnose and sometimes fatal disease.
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