Abstract
Familial hypoalphalipoproteinemias (HA) are a heterogenous group of disorders characterized by various degrees of HDL deficiency. Differential diagnosis involves clinical and biochemical evaluation after intervention designed to correct known secondary causes of low HDL. Two specific HAs are discussed in this report: 1. primary isolated HA (PIHA) is a poorly characterized entity with an apparent autosomal dominant transmission and distinct abnormalities in the structure and function of HDL. 2. Lecithin: cholesterol acyltransferase (LCAT) deficiency syndromes are caused by a number of different genetic defects that lead to at least two distinct clinical presentations i.e. familial LCAT deficiency and fish eye disease. PIHA is an example of a genetic disorder whose diagnosis would greatly be improved by the availability of molecular diagnostic tests. Conversely, the effect of the genetic heterogeneity of LCAT deficiency syndromes on diagnosis is best overcome by utilizing existing biochemical measurement of LCAT activity and the plasma cholesterol esterification rate.
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