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Research Article| Volume 33, ISSUE 5, P699-710, May 1992

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Two apolipoprotein B gene defects in a kindred with hypobetalipoproteinemia, one of which results in a truncated variant, apoB-61, in VLDL and LDL.

Open AccessPublished:May 01, 1992DOI:https://doi.org/10.1016/S0022-2275(20)41434-8
Two apolipoprotein B gene defects in a kindred with hypobetalipoproteinemia, one of which results in a truncated variant, apoB-61, in VLDL and LDL.
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      We report the presence of two distinct defects of the gene for apolipoprotein B, one resulting in a new truncated variant, apoB-61, in a kindred with familial hypobetalipoproteinemia (FHB). The proband (age 33) and a sister (age 36) are both compound heterozygotes with total cholesterol levels of 39 mg/dl and 50 mg/dl, and apoB levels of 1 mg/dl and 2 mg/dl in plasma, respectively. Both appear to be asymptomatic. The apoB-61 mutation, present in a total of five individuals and inherited from the proband's father, is a 37 bp deletion in exon 26 starting with nucleotide 8525. This results in an apoB of 2784 amino acids with 12 novel carboxy-terminal residues. The apoB-61 is present to a considerable degree, relative to apoB-100, in the proband's very low (VLDL) and low density (LDL) lipoprotein fractions. Both lipoprotein fractions have abnormal particle size distribution by electron microscopy. The LDL contain cuboidal particles. Total cholesterol, LDL cholesterol, and apoB levels in the family display three phenotypic patterns: normal, low, and extremely low. ApoB haplotyping indicates the presence of another defective apoB allele in a total of seven individuals. This allele leads to low levels of apoB-100. The second apoB gene-linked defect occurring together with the apoB-61 mutation explains the 3-phenotype pattern. The severe hypocholesterolemia seen in the proband and a sister result from the genetic compound state involving both alleles. This study shows that severe hypolipidemia in an individual heterozygous for a truncation in apoB is likely to involve a second genomic defect.

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      Published online: May 01, 1992

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      DOI: https://doi.org/10.1016/S0022-2275(20)41434-8

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