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Simple method for detection of mutations causing hereditary fructose intolerance.

C Kullberg-Lindh¹, C Hannoun, M Lindh

¹Department of Pediatrics, Göteborg University, Sweden. carola.kullberg-lindh@pediat.gu.se

Journal of Inherited Metabolic Disease

|March 18, 2003

Summary

Hereditary fructose intolerance (HFI) is caused by aldolase B gene mutations. A new RFLP test efficiently detects the two most common HFI mutations, aiding in diagnosis and screening.

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Area of Science:

Biochemistry
Genetics
Metabolic Disorders

Background:

Aldolase B enzyme is crucial for sugar metabolism.
Deficiency in aldolase B leads to hereditary fructose intolerance (HFI), characterized by hypoglycemia and abdominal distress.
Genetic mutations in the aldolase B gene are the primary cause of HFI.

Observation:

Two cases of HFI were identified using an intravenous fructose tolerance test.
A novel restriction fragment length polymorphism (RFLP) test was developed to detect common aldolase B mutations.
The RFLP method involves PCR amplification of exon 5, followed by Cac8I enzyme digestion and agarose gel electrophoresis.

Findings:

The new RFLP test accurately identifies the A149P and A174D mutations in aldolase B.
This single-reaction assay can detect one or both of these prevalent mutations.
These two mutations account for over 70% of all mutations causing HFI.

Implications:

The described RFLP method offers a potentially valuable tool for HFI screening.
Early and accurate identification of HFI mutations can facilitate timely clinical management.
This diagnostic approach may improve the identification of individuals at risk for HFI.