What is the clinical evidence from this study?

Study design: Observational. Population: Familial hypobetalipoproteinemia (FHBL). Intervention: Genetic linkage to the apoB gene. Primary outcome: Linkage of FHBL to the apoB gene (LOD score 8.5).

What question did this study set out to answer?

Determine whether familial hypobetalipoproteinemia without detectable truncated apolipoprotein B forms is genetically linked to the apoB gene locus.

February 26, 1998American Journal of Medical Genetics

Genetic heterogeneity in familial hypobetalipoproteinemia: Linkage and non-linkage to the apoB gene in caucasian families

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Key result

Linkage analysis in 6 Caucasian families with familial hypobetalipoproteinemia demonstrated linkage to the apoB gene in 5 families (LOD score 8.5) and excluded linkage in 1 family (LOD score -25.2).

Population

6 Caucasian families with Familial hypobetalipoproteinemia, defined as individuals with apoB levels in the…

Design

Other

Authors

JPJudit I. PulaiSaint George Hospital RNRosalind J. NeumanBarnes-Jewish Hospital AGAntoinette W. GroenewegenUniversity Medical Center Utrecht

Discussion

Member takes

Implication

Supports genetic heterogeneity in familial hypobetalipoproteinemia; leaves open discovery of non-apoB loci.

Key Points

Determine whether familial hypobetalipoproteinemia without detectable truncated apolipoprotein B forms is genetically linked to the apoB gene locus.
Assessed plasma apolipoprotein B (apoB) levels across six Caucasian kindreds, defining affected status as apoB levels within the 5th percentile.
Screened plasma samples for truncated forms of apoB protein using sensitive immunoblotting.
Performed two-point linkage analyses using three flanking microsatellite markers (D2S131, D2S149, D2S144), an intragenic apoB/XbaI marker, and a 3' variable number of tandem repeats (VNTR) marker.
Confirmed linkage to the apoB 3' VNTR marker in five kindreds (D, T, De, C, and Z) with a combined maximum LOD score of 8.5 at theta = 0 (individual flanking marker LOD scores of 5.0, 2.4, 1.3, 1.2, and 2.1).
Excluded linkage to the apoB gene locus in the sixth kindred (F kindred), yielding LOD scores of -25.2 at the 3' VNTR and -7.8 at the intragenic apoB/XbaI marker at theta = 0.

Study Design

Type

Observational

Structured PICO

Population

6 Caucasian kindreds with familial hypobetalipoproteinemia (FHBL) without truncated forms of apoB protein.

Exposure

Linkage analysis using 3 microsatellite markers flanking the apoB gene (D2S131, D2S149, and D2S144), a 3' variable number of tandem repeats (VNTR) marker, and one intragenic marker

Outcome

Linkage of FHBL to the apoB gene measured by LOD scoressurrogate

Main Result

Effect estimate: LOD score 8.5

The study demonstrates genetic heterogeneity in familial hypobetalipoproteinemia, with most families showing linkage to the apoB gene and one family showing non-linkage, suggesting the involvement of novel genes.

Cite This Study

Pulai et al. (1998) conducted an observational in Familial hypobetalipoproteinemia (FHBL). Genetic linkage to the apoB gene was evaluated on Linkage of FHBL to the apoB gene (LOD score 8.5). Linkage analysis in 6 Caucasian families with familial hypobetalipoproteinemia demonstrated linkage to the apoB gene in 5 families (LOD score 8.5) and excluded linkage in 1 family (LOD score -25.2).

synapsesocial.com/papers/6a1eded2cbc03da829ac866f https://doi.org/10.1002/(sici)1096-8628(19980226)76:1<79::aid-ajmg15>3.0.co;2-m

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Genetic heterogeneity in familial hypobetalipoproteinemia: Linkage and non-linkage to the apoB gene in caucasian families

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

Genetic heterogeneity in familial hypobetalipoproteinemia: Linkage and non-linkage to the apoB gene in caucasian families

Discussion

Member takes

Implication

Key Points

Study Design

Structured PICO

Main Result

Cite This Study

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