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[Apolipoprotein B]

H Itakura, A Matsumoto

    Nihon Rinsho. Japanese Journal of Clinical Medicine
    |December 1, 1994
    PubMed
    Summary
    This summary is machine-generated.

    The human apolipoprotein B (apo B) gene is on chromosome 2. Apo B mRNA editing in intestinal cells creates a stop codon, influencing lipoprotein production and related diseases.

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    Area of Science:

    • Genetics and Molecular Biology
    • Biochemistry
    • Human Physiology

    Context:

    • The apolipoprotein B (apo B) gene, located on chromosome 2 (p23-p24), encodes both apo B-100 and apo B-48.
    • Apo B mRNA undergoes a unique editing process in human intestinal cells, involving a specific enzyme that converts a cytosine to a uracil, creating a premature stop codon.
    • This editing mechanism is crucial for generating apo B-48 from apo B-100 mRNA.

    Purpose:

    • To detail the genetic mapping and structural organization of the human apo B gene.
    • To elucidate the mechanism of apo B mRNA editing in intestinal cells, including the identification of the editing enzyme.
    • To explore the relationship between apo B gene mutations, mRNA editing, and lipid metabolism disorders like familial hypobetalipoproteinemia and abetalipoproteinemia.

    Summary:

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    • The human apo B gene, spanning 43 kb with 29 exons, is mapped to chromosome 2p23-p24.
    • Apo B mRNA editing in the intestine introduces a stop codon via cytosine-to-uracil conversion, mediated by a 236-amino acid cytidine deaminase homodimer.
    • Mutations in the apo B gene or defects in microsomal triglyceride transfer protein contribute to hypobetalipoproteinemia and abetalipoproteinemia, respectively.

    Impact:

    • Provides a molecular understanding of apo B synthesis and its regulation.
    • Highlights the role of RNA editing in lipoprotein metabolism and human health.
    • Offers insights into the genetic basis of dyslipidemias, potentially guiding diagnostic and therapeutic strategies.