CDKN2B-AS1 rs6642976: What Your Genotype Means
The rs6642976 variant is a single-nucleotide polymorphism located on chromosome 9p21.3 within the non-coding RNA gene CDKN2B-AS1. Research has evaluated this genomic region for its statistical associations with vascular biology, coronary artery disease, and myocardial infarction risk. However, direct evidence specifically linking rs6642976 to individual health outcomes remains limited and primarily population-based.
What each genotype means
Baseline risk profile
This genotype is located within the 9p21.3 risk locus, a region extensively studied for its association with cardiovascular health. Research indicates that variations in this region may influence the expression of genes involved in cell cycle regulation, though the specific functional impact of this variant remains a subject of ongoing investigation. This result should not be used to predict individual health outcomes or diagnose disease.
This genotype is common in many populations, though exact frequencies vary significantly by ancestry.
Baseline risk profile
This genotype is located within the 9p21.3 risk locus, a region extensively studied for its association with cardiovascular health. Research indicates that variations in this region may influence the expression of genes involved in cell cycle regulation, though the specific functional impact of this variant remains a subject of ongoing investigation. This result should not be used to predict individual health outcomes or diagnose disease.
This genotype is common in many populations, though exact frequencies vary significantly by ancestry.
Baseline risk profile
This genotype is located within the 9p21.3 risk locus, a region extensively studied for its association with cardiovascular health. Research indicates that variations in this region may influence the expression of genes involved in cell cycle regulation, though the specific functional impact of this variant remains a subject of ongoing investigation. This result should not be used to predict individual health outcomes or diagnose disease.
This genotype is common in many populations, though exact frequencies vary significantly by ancestry.
Genomic Location and the 9p21.3 Locus
The single-nucleotide polymorphism rs6642976 is situated on the short arm of chromosome 9 at band 21.3 (9p21.3). This chromosomal region gained worldwide prominence in medical genetics after genome-wide association studies pinpointed it as a major hotspot for cardiovascular traits. The variant is located within the locus of CDKN2B-AS1, also historically known as ANRIL. Unlike variants found in protein-coding exons that directly alter amino acid chains, rs6642976 resides in a non-coding genomic segment. In such regions, base changes typically exert influence—if any—by altering regulatory elements, modifying chromatin accessibility, or affecting how nearby genes are transcribed. Because chromosome 9p21.3 features tight linkage disequilibrium, many variants in this vicinity are inherited together as broad ancestral haplotypes, making it challenging to isolate the exact biological contribution of an individual marker like rs6642976.
Function of the CDKN2B-AS1 Gene
The CDKN2B-AS1 gene transcribes a long non-coding RNA (lncRNA) known as cyclin-dependent kinase inhibitor 2B antisense RNA 1. Rather than being translated into a cellular protein, this RNA molecule functions as a master epigenetic scaffold and regulatory controller. It interacts directly with Polycomb repressive complexes (PRC1 and PRC2) to orchestrate the transcriptional repression of neighboring tumor suppressor and cell-cycle genes, notably CDKN2A and CDKN2B. These adjacent genes produce crucial proteins, such as p15INK4b, p16INK4a, and p14ARF, which govern cell proliferation, vascular remodeling, and cellular senescence. In the context of cardiovascular biology, altered expression of CDKN2B-AS1 transcripts has been tied to smooth muscle cell proliferation, inflammatory signaling in vascular tissue, and the stability of atherosclerotic plaques within arterial walls.
Cardiovascular Research and Strength of Evidence
The chromosome 9p21.3 hotspot is strongly linked to susceptibility to coronary artery disease (CAD) and myocardial infarction across diverse global cohorts. However, the specific evidence directly implicating rs6642976 itself is classified as limited. While broad 9p21.3 haplotypes show robust statistical relationships with cardiovascular outcomes that often operate independently of traditional factors like blood pressure, specific single-nucleotide polymorphisms in this block differ in their individual effect sizes. Many published studies focus primarily on prominent sentinel markers in the region, such as rs1333049, while rs6642976 is typically evaluated as part of larger tagging arrays or exploratory cohorts. As a result, scientific consensus views rs6642976 as a regional marker whose statistical correlations reflect its genomic neighborhood rather than an independently proven, isolated driver of cardiac risk.
Interpreting Genetic Associations in Daily Life
Discovering an association between a 9p21.3 marker and cardiovascular disease can sound alarming, but genetic data of this kind represents relative statistical probability across large populations, not a personal medical diagnosis. Carrying one or two risk-associated alleles does not mean an individual will develop heart disease, nor does a neutral genotype offer immunity. Cardiovascular health is profoundly multifactorial, shaped overwhelmingly by modifiable factors such as dietary patterns, physical activity, blood pressure, smoking status, and blood lipid profiles. Consumers should not attempt to alter medication regimens or undertake medical interventions based on an rs6642976 result. Instead, genetic insights are best used as an educational prompt to discuss comprehensive cardiovascular prevention and standard clinical screenings with a qualified healthcare provider.
How common is this variant?
The variant allele is common in human populations, present in approximately 30% to 40% of individuals of European ancestry. Frequencies can vary moderately across African, Asian, and Hispanic demographic groups due to differing ancestral haplotype structures across chromosome 9p21.3.
Frequently asked questions
Does having the rs6642976 risk allele mean I will have a heart attack?
No. Genetic variants identified in genome-wide association studies indicate small statistical differences across large groups of people, not personal certainties. Heart disease is caused by complex interactions between multiple genes, lifestyle habits, diet, and clinical factors such as cholesterol and blood pressure.
What is the function of the CDKN2B-AS1 gene?
CDKN2B-AS1 produces a long non-coding RNA molecule that helps regulate the activity of nearby genes controlling cell growth and aging. It plays a role in cellular senescence and the behavior of cells lining the blood vessel walls.
Can lifestyle changes reduce the risk linked to chromosome 9p21.3 variants?
Yes. Clinical studies consistently demonstrate that adherence to a heart-healthy lifestyle—including regular exercise, a balanced diet, and avoiding tobacco—significantly mitigates cardiovascular risk regardless of an individual's genetic background.
Is genetic testing for rs6642976 recommended by doctors?
Routine clinical guidelines do not currently recommend testing individual 9p21.3 single-nucleotide polymorphisms for standard patient care. Physicians rely instead on established clinical risk scores that assess blood pressure, lipid levels, age, and family history.
Sources & further reading
Educational information only, last refreshed 9/7/2026. Not medical advice — these associations describe population statistics, not individual predictions.
Curious what your genotype is for rs6642976?
Upload a raw DNA file from 23andMe, AncestryDNA, MyHeritage, or FamilyTreeDNA and see this variant — plus thousands more — interpreted in your full report.
Get my report — $29Related variants in CDKN2B-AS1
This variant in the CDKN2B-AS1 long noncoding RNA gene is associated with extreme longevity in genome-wide association studies.
A non-coding variant in the CDKN2B-AS1 locus associated with human longevity and survival beyond 90 years of age.
Non-coding RNA locus SNP associated with endometriosis development through altered regulation of cell cycle progression and local tissue remodeling.
This variant is a well-established risk locus for coronary artery disease and related cardiovascular conditions.
Located in the non-coding CDKN2B-AS1 locus, this variant confers significant risk for normal-tension and primary open-angle glaucoma.
Chromosome 9p21 non-coding regulatory variant conferring increased predisposition to coronary artery disease, myocardial infarction, and intracranial aneurysm.