NCT06471387

Unraveling the Genetic Basis of Nicotine Addiction for Novel Therapeutic Strategies

Exploring the Genetic and Molecular Underpinning of Nicotine Addiction for the Development of New Therapeutic Strategies

• Status: Recruiting
• Phase: —
• Study type: Observational
• Enrollment: 200 (estimated)
• Sponsor: University of Cyprus · Academic / Other
• Sex: All
• Age: 18 Years – 60 Years
• Healthy volunteers: Not accepted

Summary

This case-control study aims to investigate the genetic and molecular bases of nicotine addiction to identify potential therapeutic targets. The project will involve drug repurposing using Mendelian Randomization, a smoking cessation intervention, and the analysis of methylation status in participants undergoing nicotine withdrawal.

Detailed description

Cigarette smoking remains the largest preventable risk factor for chronic diseases and premature mortality worldwide. While several medications have been approved to aid smoking cessation, most individuals relapse following an initial period of abstinence, with only around 15% achieving long-term abstinence beyond 6-12 months. This highlights a critical need to identify novel drug targets and develop more effective pharmacotherapies to treat nicotine addiction and maintain long-term smoking abstinence. The proposed case-control study aims to leverage an interdisciplinary approach combining genetic epidemiology and molecular biology to: 1) Identify potential novel druggable targets for smoking cessation using a drug repurposing Mendelian randomization (MR) strategy, and 2) Assess whether epigenetic modifications (DNA methylation) of the identified drug target genes are associated with motivation to quit smoking, nicotine dependence severity, and vulnerability to smoking relapse following a cessation attempt. Specifically, NicoGen study utilizes large-scale genomic datasets of expression quantitative trait loci (eQTLs) and protein quantitative trait loci (pQTLs) to identify genetic variants that influence expression/levels of genes encoding druggable proteins (targets of approved drugs/clinical candidates). MR analyses will then determine if genetically-predicted expression of these genes is causally related to smoking cessation outcomes. Additionally, 200 current cigarette smokers (100 men, 100 women) will be recruited prior to smoking cessation for collection of biofluids for DNA extraction. The methylation levels of the top candidate drug target genes identified in will be assessed and compared between: 1) Cases who achieve ≥6 month abstinence vs. relapsed controls, 2) High vs. low motivation to quit groups, and 3) High vs. low nicotine dependence groups. This allows identification of epigenetic biomarkers predictive of cessation outcomes. Additionally, potential gender differences in the associations between gene methylation, motivation, dependence and relapse vulnerability will be explored to identify gender-specific drug targets.

Conditions

• Smoking Cessation
• Smoking Cessation Intervention
• Nicotine Addiction
• Epigenetics
• Molecular Biology
• Genetic Epidemiology

Interventions

Type	Name	Description
BEHAVIORAL	Flexiquit Smoking Cessation Intervention	Participants will enter a 6-week (once weekly) self-delivered computerized intervention program called Flexiquit. Developed and validated by Clinical Psychologists of the Department of Psychology at the University of Cyprus, Flexiquit is an avatar-led app designed to support smoking cessation. It aims to assist with abstinence and monitor participants' progress through personalized modules and assessments.

Timeline

• Start date: 2023-11-01
• Primary completion: 2025-10-31
• Completion: 2025-10-31
• First posted: 2024-06-24
• Last updated: 2024-06-25

Locations

1 site across 1 country: Cyprus