Genetic determinants of juvenile stroke

Area of Science:

• Genetics
• Neurology
• Vascular Biology

Background:

• Stroke is a complex disorder with evidence for a genetic basis, though identified genetic factors have small contributions.
• Significant progress has been made in understanding single-gene disorders linked to ischemic stroke, particularly in younger individuals.
• Heritable connective tissue disorders are known to cause stroke, often through cervical artery dissection.

Purpose of the Study:

• To review the current understanding of genetic factors contributing to various types of stroke.
• To highlight advances in identifying genes for monogenic stroke and the challenges in multifactorial stroke genetics.
• To discuss the implications of genetic discoveries for understanding stroke mechanisms and developing therapies.

Main Methods:

• Review of epidemiological data from twin and family studies.
• Analysis of genetic studies, including single-gene disorder identification (e.g., NOTCH3 in CADASIL, TREX1 in RVCL).
• Examination of genome-wide association studies (GWAS) and pharmacogenomic research for ischemic stroke.

Main Results:

• Specific gene mutations (NOTCH3, TREX1, FBN1, COL3A1) are linked to distinct stroke types and vascular conditions.
• Sickle-cell disease highlights the role of modifier genes and gene-gene interactions in stroke risk.
• GWAS have not yet identified single common variants with major stroke risk, but pharmacogenomic studies show genetic influences on drug response.

Conclusions:

• Genetic factors are crucial in specific stroke subtypes, offering insights into small-vessel disease and cervical artery dissection.
• Identifying genes for multifactorial stroke remains challenging, necessitating larger-scale studies.
• Future research focusing on common variants and pathways will likely lead to novel therapeutic strategies for cerebrovascular disorders.