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Intern Med. 1996 Jul;35(7):550-4.

Hereditary deficiency of lactate dehydrogenase H-subunit.

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Department of Internal Medicine, Shigei Hospital, Kurashiki.


We report herein the fifth family of hereditary deficiency of lactate dehydrogenase (LDH) H-subunit with an autosomal recessive inheritance including two cases of complete deficiency. Their LDH activities were low both in the serum and in the red blood cells (RBC). Electrophoretic analysis revealed that the patients with the complete deficiency had only the LDH5 isozyme. The complete deficiency was associated with marked elevation of fructose-1, 6-diphosphate (FDP) and dihydroxyacetonephosphate (DHAP) and a less marked rise in glyceraldehyde-3-phosphate (GA3P) among glycolytic intermediates in the RBC. Furthermore, hemolysis was observed in the present cases, but this finding was not included in the other reports.

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