Skip to ContentSkip to Navigation
About usMedical SciencesResearchPediatrics
University Medical Center Groningen

New Key Publication: A common variant in CCDC93 protects against myocardial infarction and cardiovascular mortality by regulating endosomal trafficking of low-density lipoprotein receptor

25 October 2019
  • Rimbert A
  • Dalila N
  • Wolters JC
  • Huijkman N
  • Smit M
  • Kloosterhuis N
  • Riemsma M
  • van der Veen Y
  • Singla A
  • van Dijk F
  • Biobank-Based Integrative Omics Studies Consortium
  • Frikke-Schmidt R
  • Burstein E
  • Tybjærg-Hansen A
  • van de Sluis B
  • Kuivenhoven JA

AIMS: Genome-wide association studies have previously identified INSIG2 as a candidate gene for plasma low-density lipoprotein cholesterol (LDL-c). However, we suspect a role for CCDC93 in the same locus because of its involvement in the recycling of the LDL-receptor (LDLR).

METHODS AND RESULTS: Characterization of the INSIG2 locus was followed by studies in over 107 000 individuals from the general population, the Copenhagen General Population Study and the Copenhagen City Heart Study, for associations of genetic variants with plasma lipids levels, with risk of myocardial infarction (MI) and with cardiovascular mortality. CCDC93 was furthermore studied in cells and mice. The lead variant of the INSIG2 locus (rs10490626) is not associated with changes in the expression of nearby genes but is a part of a genetic block, which excludes INSIG2. This block includes a coding variant in CCDC93 p.Pro228Leu, which is in strong linkage disequilibrium with rs10490626 (r2 > 0.96). In the general population, separately and combined, CCDC93 p.Pro228Leu is dose-dependently associated with lower LDL-c (P-trend 2.5 × 10-6 to 8.0 × 10-9), with lower risk of MI (P-trend 0.04-0.002) and lower risk of cardiovascular mortality (P-trend 0.005-0.004). These results were validated for LDL-c, risk of both coronary artery disease and MI in meta-analyses including from 194 000 to >700 000 participants. The variant is shown to increase CCDC93 protein stability, while overexpression of human CCDC93 decreases plasma LDL-c in mice. Conversely, CCDC93 ablation reduces LDL uptake as a result of reduced LDLR levels at the cell membrane.

CONCLUSION: This study provides evidence that a common variant in CCDC93, encoding a protein involved in recycling of the LDLR, is associated with lower LDL-c levels, lower risk of MI and cardiovascular mortality.

Last modified:19 December 2019 08.15 a.m.

More news

  • 24 January 2020

    The underexposed downsides of local self-governance and civic self-reliance

    Municipalities in shrinkage regions are keen to emphasize the importance of civic involvement in improving the local quality of life. Self-governance and self-reliance regularly lead to successful projects aimed at sustaining village facilities. Hiska...

  • 22 January 2020

    Carcasses important for plants and insects in the Oostvaardersplassen

    Allowing the carcasses of dead deer to remain in the Oostvaardersplassen nature reserve has a positive effect on biodiversity in the area. Not only do the carcasses attract many more insects and other arthropods in the short term – but also in the long...

  • 21 January 2020

    ELT MICADO Instrument Passes Preliminary Design Review

    MICADO, the first dedicated imaging system for ESO’s Extremely Large Telescope (ELT), has reached an important milestone in its design review. The MICADO consortium, together with a group of external experts from around the world, met at ESO’s Garching...