Causal Assessment of Serum Urate Levels in Cardiometabolic Diseases Through a Mendelian Randomization Study

Tanya Keenan, Wei Zhao, Asif Rasheed, Weang K. Ho, Rainer Malik, Janine F. Felix, Robin Young, Nabi Shah, Maria Samuel, Nasir Sheikh, Megan L Mucksavage, Omar Shah, Michael Morley, Annika Laser, Nadeem Hayat Mallick, Khan Shah Zaman, Mohammad Ishaq, Syed Zahed Rasheed, Fazal-Ur-Rehman Memon, Faisal AhmedBashir Hanif, Muhammad Shakir Lakhani, Muhammad Fahim, Madiha Ishaq, Naresh Kumar Shardha, Naveeduddin Ahmed, Khalid Mahmood, Waseem Iqbal, Saba Akhtar, Rabia Raheel, Christopher J. O'Donnell, Christian Hengstenberg, Winifred März, Sekar Kathiresan, Nilesh Samani, Anuj Goel, Jemma C. Hopewell, John Chambers, Yu-Ching Cheng, Pankaj Sharma, Qiong Yang, Jonathan Rosand, Giorgio B. Boncoraglio, Shahana Urooj Kazmi, Hakon Hakonarson, Anna Köttgen, Andreas Kalogeropoulos, Philippe Frossard, Ayeesha Kamal, Martin Dichgans, Thomas P. Cappola, Muredach P. Reilly, John Danesh, Daniel J. Rader, Benjamin F. Voight, Danish Saleheen

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Background: Although epidemiological studies have reported positive associations between circulating urate levels and cardiometabolic diseases, causality remains uncertain.

Objectives: Through a Mendelian randomization approach, we assessed whether serum urate levels are causally relevant in type 2 diabetes mellitus (T2DM), coronary heart disease (CHD), ischemic stroke, and heart failure (HF).

Methods: This study investigated 28 single nucleotide polymorphisms known to regulate serum urate levels in association with various vascular and nonvascular risk factors to assess pleiotropy. To limit genetic confounding, 14 single nucleotide polymorphisms exclusively associated with serum urate levels were used in a genetic risk score to assess associations with the following cardiometabolic diseases (cases/controls): T2DM (26,488/83,964), CHD (54,501/68,275), ischemic stroke (14,779/67,312), and HF (4,526/18,400). As a positive control, this study also investigated our genetic instrument in 3,151 gout cases and 68,350 controls.

Results: Serum urate levels, increased by 1 SD due to the genetic score, were not associated with T2DM, CHD, ischemic stroke, or HF. These results were in contrast with previous prospective studies that did observe increased risks of these 4 cardiometabolic diseases for an equivalent increase in circulating urate levels. However, a 1 SD increase in serum urate levels due to the genetic score was associated with increased risk of gout (odds ratio: 5.84; 95% confidence interval: 4.56 to 7.49), which was directionally consistent with previous observations.

Conclusions: Evidence from this study does not support a causal role of circulating serum urate levels in T2DM, CHD, ischemic stroke, or HF. Decreasing serum urate levels may not translate into risk reductions for cardiometabolic conditions.

Original languageEnglish
Pages (from-to)407-416
Number of pages10
JournalJournal of the American College of Cardiology
Volume67
Issue number4
Early online date25 Jan 2016
DOIs
Publication statusPublished - 2 Feb 2016

Keywords

  • Coronary Disease/blood
  • Diabetes Mellitus, Type 2/blood
  • Global Health
  • Humans
  • Mendelian Randomization Analysis/methods
  • Morbidity/trends
  • Odds Ratio
  • Polymorphism, Single Nucleotide
  • Prognosis
  • Risk Assessment/methods
  • Risk Factors
  • Stroke/blood
  • Uric Acid/blood

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