.webp&w=384&q=75){kind=logo}
Loading, please wait...
Loading, please wait...
Cigarette smoking remains a primary preventable risk factor for cancer globally. Recent research demonstrates that long-term smoking exposure significantly alters CHRNA5 gene splicing. This molecular process modifies the nicotinic acetylcholine receptor (α5-nAChR). Specifically, the study focused on exon 5 of the CHRNA5 gene located on chromosome 15q25.1. While the rs16969968 variant typically increases smoking intensity, these findings show that environmental exposure creates independent changes in gene expression.
Researchers detected five distinct alternative isoforms of the CHRNA5 gene in human tissues. Most of these isoforms lacked significant portions of exon 5. Interestingly, long-term treatment with cigarette smoke concentrate significantly changed the abundance of these isoforms. Furthermore, this effect occurred independently of the rs16969968 alleles. Therefore, smoking-induced splicing changes can influence nicotine dependence even without the presence of the genetic variant. Consequently, these findings suggest a synergistic relationship between environmental factors and genetic susceptibility.
The data also highlights the importance of α5-nAChR composition in regulating the body's response to nicotine. Because these splicing alterations change receptor function, they potentially modulate addiction severity and lung cancer risk. Clinicians should recognize that chronic smoke exposure reshapes the molecular landscape beyond simple mutations. Moreover, this understanding may eventually lead to more personalized approaches in smoking cessation and cancer screening for heavy smokers.
Chronic smoking exposure specifically alters the alternative splicing of CHRNA5 exon 5. This results in the production of different receptor isoforms that change how the body responds to nicotine and increases cancer risk.
No, the research indicates that smoking-induced CHRNA5 gene splicing changes occur independently of the rs16969968 variant. This suggests that smoking acts both independently of and complementary to inherited genetic risks.
Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice or a professional relationship between you and the author. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Hogshead MH et al. Smoking exposure alters splicing of the nicotinic acetylcholine receptor subunit CHRNA5. Hum Genomics. 2026 Jun 16. doi: 10.1186/s40246-026-01004-y. PMID: 42304190.
Bierut LJ. Genetic vulnerability and susceptibility to substance dependence. Neuron. 2011;69(4):618-627.
Kurylowicz A et al. Splicing machinery as a target for cancer therapy. Cells. 2023;12(5):764.
Read summarized clinical updates, watch expert medical content, and earn CME certifications right from your smartphone.
Open your smartphone camera to scan and install.
Smoking significantly alters the splicing of the CHRNA5 gene, which encodes a subunit of the nicotinic acetylcholine receptor. Research highlights how long-term exposure modifies receptor composition, potentially increasing nicotine dependence and cancer risk independently of known genetic variants.
4 months ago
Depemokimab offers twice-yearly dosing for severe eosinophilic asthma and chronic rhinosinusitis with nasal polyps, significantly cutting exacerbations and hospital admissions.
4 days back
A novel copper metal-organic framework hydrogel remodels the uterine microenvironment to stimulate robust endometrial regeneration, reduce intrauterine fibrosis, and restore reproductive fertility, offering a groundbreaking strategy for managing refractory endometrial damage and Asherman syndrome.
4 days back
New research reveals that non-ablative radiotherapy suppresses ventricular tachycardia by increasing conduction velocity via NaV1.5 upregulation and action potential prolongation. However, sustained sodium current elevation and depressed calcium handling highlight the need for careful clinical translation.
6 days back
A single-cell transcriptomic atlas reveals how peripheral nerve injuries cause dorsal root ganglion remodeling. By evaluating proximal nerve crush and resection, researchers identify distinct glial and immune programs that resolve neuropathic pain and promote regeneration.
4 days back
A breakthrough study demonstrates that fullerol-primed extracellular vesicles generated in a 3D SECCS bioreactor attenuate ferroptosis and restore myogenic regeneration in diabetes via the FOXO3 pathway, offering a cell-free therapeutic strategy for diabetic musculoskeletal degeneration.
4 days back
