rs643118: Understanding This Reproductive Health Genetic Marker
The genetic variant rs643118 is an intergenic single nucleotide polymorphism (SNP) that has been identified in research studies as a potential marker for reproductive health traits. While it does not reside within a protein-coding gene, it is frequently studied alongside other variants to understand complex genetic contributions to human development.
What each genotype means
Typical reproductive marker profile
This genotype represents the common variant state for this location. Current research identifies this marker as having potential significance for reproductive health traits, though specific clinical implications for individuals remain under investigation.
This is the most common genotype observed in most global populations.
Typical reproductive marker profile
This genotype represents a heterozygous state for this marker. While this SNP is noted in research as a potential marker for reproductive health, there is currently no evidence to suggest this specific combination significantly alters reproductive outcomes.
This genotype is found at moderate frequencies across diverse ancestral groups.
Typical reproductive marker profile
This genotype represents the alternative variant state for this location. As this is an intergenic marker, its role in reproductive health is currently limited to statistical associations in large-scale studies rather than direct functional impact.
This genotype is less common than the homozygous AA state in most studied populations.
What is rs643118 and where is it located?
The variant rs643118 is a single nucleotide polymorphism, which is a variation at a single position in the DNA sequence. It is classified as an intergenic variant, meaning it is located in the non-coding regions of the genome that lie between genes. Specifically, research has noted its location on chromosome 1p32.2, where it sits within an intron of the TRAF3-interacting protein 3 (TRAF3IP3) gene. Because it is not located within a gene that codes for a protein, its biological function is not as straightforward as variants that directly alter protein structure. Instead, researchers often investigate such variants to see if they influence the regulation of nearby genes or serve as markers for other functional changes in the genome. Understanding these non-coding regions is a major focus of modern genomics, as they often contain regulatory elements that control how and when genes are expressed in different tissues.
Research associations and evidence strength
The evidence linking rs643118 to reproductive health traits is currently considered moderate. In scientific literature, this SNP has been identified as one of several markers showing potential significance in studies regarding reproductive health and developmental outcomes. For instance, some research has explored its role as a susceptibility variant in the context of non-syndromic cleft lip and palate, where it was observed as a shared signal across both Asian and European populations. When researchers use such SNPs to build risk scoring systems, they are looking for statistical correlations rather than direct causation. It is important to note that while these associations are statistically significant in specific study cohorts, they do not imply that the variant alone determines a health outcome. The field of reproductive genetics is highly complex, involving the interplay of many genetic markers, environmental factors, and developmental processes, meaning that the effect size of any single SNP like rs643118 is typically small.
What you can and cannot do with this information
Genetic information regarding variants like rs643118 is intended for educational and research purposes only. You cannot use this information to diagnose a medical condition, predict your own reproductive health, or make decisions about medical treatments. Genetic associations observed in large-scale studies describe population-level trends, not individual outcomes. If you have concerns about reproductive health or family planning, it is essential to consult with a qualified healthcare provider or a genetic counselor. They can provide context based on your personal and family medical history, which is far more predictive than any single genetic marker. Furthermore, if you are ever prescribed medication based on genetic testing, always discuss the dosing and implications with your clinician or pharmacist. Never attempt to interpret your own genetic data to guide clinical decisions, as the science is nuanced and requires professional expertise to translate into meaningful health guidance.
How common is this variant?
There is no specific, universally recorded population frequency for rs643118 in major public databases; its prevalence varies significantly depending on the ancestral background of the population studied.
Frequently asked questions
Is rs643118 a cause of infertility?
No, rs643118 is not considered a direct cause of infertility. It is a genetic marker identified in statistical studies, and its presence does not mean an individual will experience reproductive issues.
Can I use this SNP to predict my reproductive health?
No, you cannot use this SNP to predict your reproductive health. Reproductive health is influenced by a vast array of genetic, environmental, and lifestyle factors that a single SNP cannot account for.
Where can I find more information on this variant?
You can search for rs643118 on the NCBI dbSNP database or the GWAS Catalog. These resources provide technical data and links to the original research papers where the variant was identified.
Should I be worried if I have the T allele?
No, there is no reason to be worried. Genetic variants are a normal part of human diversity, and most do not have a significant impact on your health or daily life.
Sources & further reading
Educational information only, last refreshed 9/29/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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