Abstract:
:Apolipoprotein E from human serum shows a genetic polymorphism determined by two autosomal codominant alleles, Apo En and Apo Ed. Homozygosity for the gene Apo Ed (phenotype Apo E-D) results in primary dysbetalipoproteinemia, but only some individuals with this phenotype develop gross hyperlipidemia (hyperlipoproteinemia type III). Vertical transmission of dysbetalipoproteinemia represents pseudodominance due to the high frequency of the gene Apo Ed. Dysbetalipoproteinemia is already expressed in childhood. To assess the influence of other genes on the expression of hyperlipidemia in phenotype Apo E-D, comparative studies were carried out in kindreds of hypercholesterolemic (group A) and normo- or hypocholesterolemic probands with dysbetalipoproteinemia (group B). This demonstrated the occurrence of familial (non-type III) forms of hyperlipidemia in group A but not in group B kindreds. Distribution of lipoprotein phenotypes in five of the group A kindreds was consistent with the occurrence of familial combined hyperlipidemia. Apo E phenotypes and hyperlipidemia segregated independently. It is concluded that primary dysbetalipoproteinemia is a frequent monogenic variant of lipoprotein metabolism, but not a disease. Coincidence in one individual of genes for this specific dyslipoproteinemia with any of the genes for monogenic or polygenic forms of familial hyperlipidemia results in hyperlipoproteinemia type III. Hence hyperlipoproteinemia type III is caused by at least two non-allelic genes and is a polygenic disorder.
journal_name
Clin Genetjournal_title
Clinical geneticsauthors
Utermann G,Vogelberg KH,Steinmetz A,Schoenborn W,Pruin N,Jaeschke M,Hees M,Canzler Hsubject
Has Abstractpub_date
1979-01-01 00:00:00pages
37-62issue
1eissn
0009-9163issn
1399-0004journal_volume
15pub_type
杂志文章abstract::A deletion of 7q21.2-q22.1 has been found in a patient with split foot and developmental retardation. Molecular analysis using polymerase chain reaction (PCR) showed deletion of three microsatellite markers, D7S527, D7S479 and D7S554, in the patient's paternal chromosome. These results pinpoint the critical region for...
journal_title:Clinical genetics
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pub_type: 杂志文章
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journal_title:Clinical genetics
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journal_title:Clinical genetics
pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:1992-09-01 00:00:00
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