Molecular basis for apo A-IV polymorphisms.

Abstract:

:Apolipoprotein (apo) A-IV is involved in the metabolism of triglyceride-rich lipoproteins and high-density lipoproteins and may thus play an important role in lipid metabolism, although the precise physiological function of apo A-IV is unknown. Structural and functional alterations of apolipoproteins, caused by a variety of mutations, have been shown to influence lipoprotein metabolism in several ways. Genetic studies are consistent with a single locus for apo A-IV with two main codominant alleles A-IV1 and A-IV2. The basis behind some of these electrophoretic variants has been determined on a molecular level by the aid of the polymerase chain reaction and sequencing of the amplified DNA. For instance, apo A-IV1 and apo A-IV2 alleles are explained by glutamine for histidine change of amino acid 360. Furthermore, several polymorphisms not leading to charge differences have been characterized. The genetic variability of apo A-IV may be of help in elucidating the functional role of apo A-IV in lipoprotein metabolism. In our study, the frequencies of the alleles due to Gln360-->His and Thr347-->Ser substitutions in a Finnish population sample were similar to those reported from other populations. In addition we have identified a novel genetic polymorphism of apo A-IV, Asn127-->Ser. In the Finnish population the asparagine for serine change of amino acid 127 was the most common apo A-IV polymorphism. There are no reports from other populations concerning this polymorphism.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Ann Med

journal_title

Annals of medicine

authors

Tenkanen H,Ehnholm C

doi

10.3109/07853899209147839

subject

Has Abstract

pub_date

1992-10-01 00:00:00

pages

369-74

issue

5

eissn

0785-3890

issn

1365-2060

journal_volume

24

pub_type

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