Summary
Impaired glycogen synthesis after insulin stimulation accounts for most of the insulin resistance in patients with non-insulin-dependent diabetes mellitus (NIDDM). The glycogen synthase gene (GYS1), which encodes the rate-limiting enzyme for glycogen synthesis, is a promising candidate gene for NIDDM. Therefore, we screened all 16 exons of this gene by single-strand conformation polymorphism analysis in 40 patients with NIDDM (age 67 ± 2 years, body mass index 28.2 ± 0.6 kg/m2) from Taipalsaari, eastern Finland. The Gly464Ser variant (exon 11) and a silent polymorphism TTC342TTT (exon 7) have been reported previously. In addition, we found a new variant Gln71His (exon 2) and a new amino acid polymorphism Met416Val (exon 10). An additional sample of 65 patients with NIDDM and 82 normoglycaemic men (age 54 ± 1 years, body mass index 26.3 ±1.4 kg/m2) were screened. The allele frequency of the TTC342TTT silent substitution was 0.29 in both NIDDM and normoglycaemic subjects. The Gln71His and Gly464Ser variants were found in 1 (1 %) and 3 (3 %) subjects, respectively, of the 105 NIDDM patients and in none of the 82 normoglycaemic men. The Met416Val polymorphism was found in 16 (15 %) of the 105 NIDDM patients and in 14 (17 %,) of the 82 control subjects (all heterozygous). The Met416Val polymorphism was not associated with insulin resistance in two groups of normoglycaemic subjects. In conclusion, the new Gln71His and Met416Val substitutions and other variants of the glycogen synthase gene are unlikely to make a major contribution to insulin resistance and NIDDM in diabetic patients from eastern Finland. [Diabetologia (1997) 40: 1313-1319]
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Abbreviations
- Gln71His:
-
Glutamine71Histidine
- Gly464Ser:
-
Glycine464Serine
- GS:
-
glycogen synthase
- GYS1:
-
glycogen synthase locus
- Met416Val:
-
Methionine416Valine
- PCR:
-
polymerase chain reaction
- SSCP:
-
single-strand conformation polymorphism analysis.
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Rissanen, J., Pihlajamäki, J., Heikkinen, S. et al. New variants in the glycogen synthase gene (Gln71His, Met416Val) in patients with NIDDM from eastern Finland. Diabetologia 40, 1313–1319 (1997). https://doi.org/10.1007/s001250050826
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DOI: https://doi.org/10.1007/s001250050826