A novel missense mutation in human lactate dehydrogenase B-subunit gene.
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Takatani T, Takaoka N, Tatsumi M, Kawamoto H, Okuno Y, Morita K, Masutani T, Murakawa K, Okamoto Y
A novel missense mutation in human lactate dehydrogenase B-subunit gene.
Mol Genet Metab. 2001 Aug;73(4):344-8.
- PubMed ID
- 11509017 [ View in PubMed]
- Abstract
Reduced activity of serum lactate dehydrogenase (LDH; EC 1.1.1.27) was found in a male medical student during practical examinations of his own blood. Serum LDH isoenzyme pattern showed reductions in activities of the isoenzymes with lower subunit A/B ratios such as LDH1 and LDH2. These findings were indicative of a partial LDH-B subunit deficiency, which was confirmed in erythrocyte hemolysates by Western blotting. Polymerase chain reaction (PCR)-based DNA sequence analysis of the LDH-B subunit gene revealed a heterozygous nucleotide change: a guanine to adenine substitution in codon 69 (GGG --> GAG) at the third exon of the LDH-B subunit gene that resulted in a glycine to glutamic acid substitution (G69E). The mutation was confirmed by PCR-restriction fragment length polymorphism (RFLP) analysis using a mismatched primer to introduce a new NcoI restriction site. The same heterozygous mutation was found in his mother but not in other family members. This mutation involves a residue belonging to alphaC helix in LDH-B subunit protein molecule that functions as an interface for other subunits.