Abstract:
:Chylomicron retention disease (CRD) is a rare autosomal recessive disorder characterized by the absence of post-prandial chylomicrons and apolipoprotein (apo) B-48 in sera from affected individuals. Apo B-100 is synthesized, and apo B-100-containing lipoproteins are present in sera. A crucial difference between the synthesis and secretion of apo B-containing lipoproteins from the liver and gut in man is the generation of apo B-48 by editing of apo B mRNA in the gut to create a premature stop-translation codon. In this study the hypothesis that CRD may represent an absence of editing of apo B mRNA in the gut was investigated. Two affected sisters were identified as having low cholesterol levels and an absence of post-prandial chylomicronemia. Segregation analysis in the family showed that the apo B locus is not the site of the defect. Using reverse transcription-polymerase chain reaction (RT-PCR), duodenal biopsy-mRNA from the affected sisters was isolated and analyzed. The apo B editing site was amplified after cDNA synthesis, and the products analyzed by the primer extension assay. The results show that editing of apo B mRNA is normal in patients with CRD. The data provides strong confirmation that the primary defect in CRD is not in the synthesis, or editing of apo B mRNA in the gut. More likely, the disease arises from a defect in a gene crucial to the assembly and/or secretion of the chylomicron particle.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Patel S,Pessah M,Beucler I,Navarro J,Infante Rdoi
10.1016/0021-9150(94)90115-5subject
Has Abstractpub_date
1994-08-01 00:00:00pages
201-7issue
2eissn
0021-9150issn
1879-1484pii
0021-9150(94)90115-5journal_volume
108pub_type
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