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LCAT activity and mass were assayed simultaneously in 23 members of a new family case, revealing two homozygotes with a markedly low HDL--cholesterol level and ester cholesterol ratio. The LCAT mass in these patients was only 0.8 and 0.9 micrograms/ml, respectively (normal range 4.4-8.1) and their LCAT activity was 4 and 6 nM/ml/h 37 degrees C (normal range 60-120). Apolipoprotein (Apo) A-I and II levels were significantly low; however, apolipoprotein E tended to be high. In two-dimensional electrophoresis, apo A-I isoform visualized the increase of immature apo A-I; that is, A-I2. One subject showed the clinical characteristics of classic LCAT deficiency; however, the other, who was a vegetarian, showed corneal opacities and red cell deformity, but not proteinuria. This suggests that a low fat diet which decreases the level of atherogenic large LDL, may lead to a more favourable prognosis with a reduced risk for renal insufficiency. There were two different types of LCAT abnormality in this family series. Among the 10 examined paternal kindred of the proband who was one of two homozygotes, seven had a low LCAT mass but normal LCAT activity with the exception of one kindred who had a low mass and low activity. In contrast, among his seven maternal kindred examined, two had a low LCAT activity but normal mass.

japanese journal of medicine

A new case of familial lecithin: cholesterol acyltransferase (LCAT) deficiency-Paradoxical findings regarding LCAT mass and activity in 23 members of a family.