Genetic control of lecithin-cholesterol acyltransferase (LCAT) : measurement of LCAT mass in a large kindred with LCAT deficiency

Albers, J.J.; Utermann, G.

American Journal of Human Genetics 33(5): 702-708


ISSN/ISBN: 0002-9297
PMID: 7294021
Accession: 043188473

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Lecithin-cholesterol acyltransferase (LCAT) mass was measured by radioimmunoassay in a large Sardinian kindred with LCAT deficiency. The frequency distribution of LCAT levels in the M-kindred demonstrated a trimodal distribution, one more corresponding to the normal controls and containing the normal relatives, a second mode completely separate from the controls and containing subjects with LCAT levels approximately one-half normal, and a third mode distinct from the other modes containing the two subjects with LCAT deficiency. Fifteen kindred members, including all six spouses, had enzyme levels of 4.92 +/- 0.49 microgram/ml (mean +/- SD), slightly lower but in the same range as controls (6.13 +/- 0.98; no. = 66). Twelve family members, including the two obligate heterozygotes, had enzyme levels of 2.68 +/- 0.32 microgram/ml, roughly one-half that of control levels. The LCAT-deficient subjects had enzyme levels of 0.30 and 0.37 microgram/ml, respectively. Segregation of the acyltransferase deficiency gene (LCATd) provided clear evidence of an autosomal recessive mode of inheritance of LCAT deficiency. Furthermore, the data strongly suggest that family members with half-normal enzyme levels are heterozygous carriers of the LCATd gene.