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Familial lecithin-cholesterol acyltransferase deficiency in a Japanese family: Evidence for functionally defective enzyme in homozygotes and obligate heterozygotes

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Lecithin-cholesterol acyltransferase (LCAT) mass and activity were measured in a Japanese family with familial LCAT deficiency. The two LCAT-deficient subjects had LCAT mass approximately 40–46% of normal (2.65 and 2.31 μg/ml respectively, as compared with normal levels of 5.76±0.95 μg/ml in 19 Japanese subjects) and enzyme activity less than 10% of normal (9.1 and 8.3 nmol/h/ml respectively, as compared with normal levels of 100 nmol/h/ml). All obligate heterozygotes examined, including the father of the two LCAT-deficient subjects, and all five children of the deficient subjects had LCAT mass approximately 72–80% of the normal LCAT mass (4.12, 4.38, 4.45, 4.48, 4.49, 4.61 μg/ml, respectively) and LCAT activity approximately half normal (51.9, 52.4, 54.2, 56.6, and 57.2 nmol/h/ml). We conclude that the two LCAT-deficient subjects of this family have functionally defective enzyme. Furthermore, the data suggest that the plasma of the obligate heterozygotes contain both normal and functionally defective enzymes.

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Correspondence to John J. Albers.

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Albers, J.J., Chen, C., Adolphson, J. et al. Familial lecithin-cholesterol acyltransferase deficiency in a Japanese family: Evidence for functionally defective enzyme in homozygotes and obligate heterozygotes. Hum Genet 62, 82–85 (1982).

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  • Enzyme Activity
  • Internal Medicine
  • Normal Level
  • Metabolic Disease
  • Japanese Subject