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Updated: Jun 29, 2026

Targeted Next-generation Sequencing and Bioinformatics Pipeline to Evaluate Genetic Determinants of Constitutional Disease
Published on: April 4, 2018
The coagulation factor V Leiden, MTHFRC677T variant and eNOS 4ab polymorphism in young Chinese population with
Congning Shi1, Xixiong Kang, Yajie Wang
1Department of Experimental and Diagnosis Center, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100050, China. scn_2001@163.com
Insights
Genetic variations in endothelial nitric oxide synthase (eNOS) are linked to ischemic stroke risk in young adults. The eNOS 4ab variant specifically emerged as a significant risk factor in a Chinese population study.
Area of Science:
- Genetics
- Neurology
- Cardiovascular Science
Background:
- Ischemic stroke mechanisms in young adults remain unclear.
- Investigating genetic predispositions is crucial for understanding young adult stroke.
- Focus on genes related to hemostasis, homocysteine metabolism, and endothelial function.
Purpose of the Study:
- To identify genetic risk factors for ischemic stroke in young adults.
- To assess the prevalence of specific gene variants in a young stroke patient cohort.
- To compare genetic profiles of young stroke patients with age- and gender-matched controls.
Main Methods:
- Case-control study involving 97 young adult ischemic stroke patients (<45 years).
- Analysis of factor V Leiden, MTHFR C677T, and eNOS 4ab gene variants.
- Comparison with 99 age- and gender-matched healthy controls.
Main Results:
- No significant difference in MTHFR C677T genotype frequencies between patients and controls.
- Factor V Leiden variant was absent in both groups.
- A statistically significant higher prevalence of the eNOS 4bb genotype was observed in stroke patients (92.8%) compared to controls (81.8%).
Conclusions:
- The eNOS 4ab gene variant is a potential risk factor for ischemic stroke in young adults.
- Endothelial function, influenced by eNOS, plays a role in young stroke pathogenesis.
- Further research is warranted to elucidate the role of eNOS variants in ischemic stroke.
Background:
The mechanisms of ischemic stroke in young adults are poorly understood. The main goal of the current investigation was to determine the possible contribution of genes affecting hemostasis, homocysteine metabolism and endothelial function on the occurrence of ischemic stroke in a cohort of young cases and corresponding controls.
Methods:
We evaluated in 97 consecutive patients referred to our center between April 2006 and July 2007 for a history of young adult ischemic stroke (age at first event, <45 y) the prevalence of factor V Leiden, 5,10-methylenetetrahydrofolate reductase (MTHFR) C677T and endothelial nitric oxide synthase (eNOS) 4ab gene variants. Ninety-nine subjects age and gender matched (18 to 45 y) from other departments of the Tiantan Hospital served as controls.
Results:
Homozygosity for the TT genotype of the MTHFR gene was 29 of 97 (29.9%) in patients and 34 of 99 (34.3%) in controls; this difference was not statistically significant (p>0.05, chi2). Variation of factor V Leiden was not detected both in patients and in controls of this cohort. Genotype eNOS 4bb was 90 of 97 (92.8%) in patients and 81 of 99 (81.8%) in controls; this difference was statistically significant (p<0.05, chi2 test).
Conclusions:
The eNOS 4ab variant appears to be an important risk factor for ischemic stroke in young Chinese population.
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