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Joint linkage and association analysis with exome sequence data implicates SLC25A40 in hypertriglyceridemia.

Elisabeth A Rosenthal1, Jane Ranchalis, David R Crosslin

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Genetic analysis of a large family identified a rare SLC25A40 gene variant strongly linked to hypertriglyceridemia (HTG), a cardiovascular disease risk factor. This discovery highlights a new pathway for HTG and potential drug targets.

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Area of Science:

  • Genetics
  • Cardiovascular Disease
  • Molecular Biology

Background:

  • Hypertriglyceridemia (HTG) is a heritable risk factor for cardiovascular disease.
  • Current genetic knowledge explains only a small fraction of triglyceride level variation.
  • Identifying rare genetic variants is crucial for understanding HTG and developing new therapies.

Purpose of the Study:

  • To investigate the genetic basis of hypertriglyceridemia using a family study design.
  • To identify novel genetic variants associated with high triglyceride levels.
  • To explore potential new drug targets for cardiovascular disease.

Main Methods:

  • Utilized Bayesian Markov chain Monte Carlo joint oligogenic linkage and association analysis in a five-generation family.
  • Performed whole-exome sequencing to identify genetic variants.
  • Conducted whole-gene testing using Exome Sequencing Project data for validation.

Main Results:

  • Identified linkage to chromosomes 7 and 17, with specific SNVs in SLC25A40 and PLD2.
  • A missense SNV in SLC25A40 (c.374A>G) was significantly associated with triglyceride levels (p = 0.0001).
  • This SLC25A40 variant explained a substantial portion of genetic variance in TG and was confirmed in an independent cohort.

Conclusions:

  • A rare, highly conserved coding variant in SLC25A40 is a significant genetic contributor to hypertriglyceridemia.
  • This finding suggests a novel pathway involved in HTG.
  • Large pedigrees are powerful tools for discovering rare, causal genetic variants.