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Review
. 2015 Apr 24;116(9):1551-60.
doi: 10.1161/CIRCRESAHA.116.303518.

The genetic basis of peripheral arterial disease: current knowledge, challenges, and future directions

Affiliations
Review

The genetic basis of peripheral arterial disease: current knowledge, challenges, and future directions

Iftikhar J Kullo et al. Circ Res. .

Abstract

Several risk factors for atherosclerotic peripheral arterial disease (PAD), such as dyslipidemia, diabetes mellitus, and hypertension, are heritable. However, predisposition to PAD may be influenced by genetic variants acting independently of these risk factors. Identification of such genetic variants will provide insights into underlying pathophysiologic mechanisms and facilitate the development of novel diagnostic and therapeutic approaches. In contrast to coronary heart disease, relatively few genetic variants that influence susceptibility to PAD have been discovered. This may be, in part, because of greater clinical and genetic heterogeneity in PAD. In this review, we (1) provide an update on the current state of knowledge about the genetic basis of PAD, including results of family studies and candidate gene, linkage as well as genome-wide association studies; (2) highlight the challenges in investigating the genetic basis of PAD and possible strategies to overcome these challenges; and (3) discuss the potential of genome sequencing, RNA sequencing, differential gene expression, epigenetic profiling, and systems biology in increasing our understanding of the molecular genetics of PAD.

Keywords: epigenomics; genome-wide association study; molecular epidemiology; peripheral arterial disease.

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Figures

Fig. 1
Fig. 1
Arterial pathology in atherosclerotic, inflammatory, and non-atherosclerotic non-inflammatory arteriopathies. Atherosclerosis is characterized by plaques with varying amounts of inflammatory cells, lipid deposition, fibrosis, calcification, cellular necrosis, smooth muscle proliferation and necrosis, disruption of internal elastic lamina. Inflammatory arterial diseases are characterized by marked inflammatory cell infiltration and in the case of large vessel vasculitis, by giant cell formation. Features of non-inflammatory non-atherosclerotic arterial disease vary. In fibromuscular dysplasia, the prominent features are excessive fibroblasts, deposition of increased amounts of extra cellular matrix and relative paucity of inflammatory cells.
Fig. 2
Fig. 2
Family history as a risk factor for PAD. Shown are odds ratios when the affected family member is a monozygotic twin, a dizygotic twin or a sibling.25,27

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