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Nichols, R.C. et al.

Glycogenosis type VII (Tarui disease) in a Swedish family: two novel mutations in muscle phosphofructokinase gene (PFK-M) resulting in intron retentions.

Phosphofructokinase ( PFK) plays a major role in glycolysis. Human PFK is composed of three isoenzyme subunits (muscle [Ml, liver [L], and platelet [P]), which are encoded by different genes. Deficiency of muscle isoenzyme (PFK-M), glycogenosis type VII (Tarui disease), is an autosomal recessive disorder characterized by an exertional myopathy and hemolytic syndrome. Several disease-causing mutations have been identified in the PFK-M gene in Japanese, Ashkenazi Jewish, Italian, French Canadian, and Swiss patients. We describe the genetic defect in a Swedish family with affected individuals in two generations. The patients are compound heterozygotes: two different mutations result in retention of intron 13 or intron 16 sequences into mRNA. A G1127A transition destroys the 5' donor site of intron 13, resulting in a 155-nt retention of the intronic sequence. An a-to-g base change in intron 16 creates a new acceptor splice site, resulting in a 63-nt retention of intronic sequence. Both mutations are predicted to result in premature termination of translation. Some of the transcripts generated from the intron 16 mutated allele also contain intron 10 sequence unspliced.[1]

References

Glycogenosis type VII (Tarui disease) in a Swedish family: two novel mutations in muscle phosphofructokinase gene (PFK-M) resulting in intron retentions. Nichols, R.C., Rudolphi, O., Ek, B., Exelbert, R., Plotz, P.H., Raben, N. Am. J. Hum. Genet. (1996) [Pubmed]

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