PGR rs1042839: Understanding the Progesterone Receptor Variant
The rs1042839 variant is a common genetic change located within the PGR gene, which encodes the progesterone receptor. Research has investigated this variant for potential associations with susceptibility to endometriosis and other reproductive health conditions.
What each genotype means
Common progesterone receptor variant
This genotype represents the most common form of the rs1042839 variant in the progesterone receptor gene. Research into this specific marker has explored its potential role in reproductive health, including endometriosis susceptibility and pregnancy outcomes, though findings remain inconsistent across different populations.
This is the most frequent genotype observed in most global populations.
Common progesterone receptor variant
Carrying one copy of the T allele at this position is a common genetic finding. Studies have investigated whether this variant influences progesterone receptor function or reproductive disease risk, but results are mixed and often depend on the specific ancestry or environmental context of the study group.
This heterozygous genotype is found at moderate frequencies across many diverse populations.
Common progesterone receptor variant
This genotype represents the homozygous state for the T allele of the rs1042839 variant. While some research has examined this marker in the context of reproductive conditions like endometriosis or recurrent pregnancy loss, the evidence is not definitive and does not suggest a strong, singular effect on health outcomes.
This genotype is less common than the CC or CT genotypes in most studied populations.
What is rs1042839 and Where is it Located?
The variant rs1042839 is a single nucleotide polymorphism (SNP) situated on chromosome 11 at position 101,051,471 (GRCh38). It resides within the PGR gene, which is located at 11q22.1. This gene is responsible for producing the progesterone receptor, a protein that plays a critical role in human physiology. As a common variant, rs1042839 is frequently studied in the context of genetic association studies, where researchers look for correlations between specific DNA sequences and health-related traits. Because it is located within a gene that is highly active in reproductive tissues, scientists have long been interested in whether this specific change in the genetic code might influence how the body responds to progesterone or how reproductive tissues develop and function over time.
The Role of the PGR Gene
The PGR gene encodes the progesterone receptor, a member of the steroid receptor superfamily. This protein is essential for mediating the physiological effects of progesterone, a hormone that is central to the female reproductive system. Progesterone is vital for the establishment and maintenance of pregnancy, as it helps prepare the lining of the uterus for implantation and supports the early stages of gestation. Beyond pregnancy, the progesterone receptor is involved in the regulation of gene expression, influencing cellular proliferation and differentiation in various tissues. Because of its broad influence on reproductive health, variations in the PGR gene are often examined to see if they alter the receptor's function or expression levels, which could theoretically impact how tissues respond to hormonal signals during the menstrual cycle or in disease states.
Research Associations and Evidence Strength
Scientific literature has explored the potential link between rs1042839 and endometriosis, a condition where tissue similar to the lining of the uterus grows outside of it. Some studies have investigated this variant as a candidate for disease susceptibility, often noting that it may exist in linkage disequilibrium with other markers in the same genomic region. However, the evidence strength for this specific SNP remains moderate. While some retrospective case-control studies have suggested associations, genetic research in this area is complex, and results can vary significantly between different populations and study designs. It is important to note that genetic associations do not imply causation. The presence of this variant does not guarantee the development of any condition, and many factors—including environmental, lifestyle, and other genetic influences—contribute to reproductive health outcomes.
Population Frequency
The rs1042839 variant is considered a common SNP, meaning it is found at relatively high frequencies across various human populations. Because it is common, it is widely represented in genomic databases, allowing researchers to study its distribution across different ancestral groups.
What You Can and Cannot Do With This Information
Understanding your genetic variants can be an educational experience, but it is important to maintain realistic expectations regarding what this information means for your health. You cannot use the presence of the rs1042839 variant to diagnose yourself with endometriosis or any other medical condition. Genetic markers are only one small piece of a much larger biological puzzle. If you have concerns about your reproductive health, symptoms such as pelvic pain, or questions about your family history, the most effective step is to consult with a qualified healthcare provider or a reproductive specialist. They can provide a comprehensive evaluation based on your clinical history, physical examinations, and appropriate diagnostic testing. Never make changes to your health management or medical decisions based solely on genetic data without professional guidance.
How common is this variant?
The rs1042839 variant is a common polymorphism found across diverse global populations, with its specific allele frequencies varying by ancestry.
Frequently asked questions
Does having the rs1042839 variant mean I will get endometriosis?
No. Genetic variants like rs1042839 are associated with statistical trends in populations, not individual outcomes. Many people with this variant do not develop endometriosis, and many with the condition do not carry the variant.
Is rs1042839 a diagnostic test for reproductive issues?
No, this variant is not used as a diagnostic tool. Diagnosis of reproductive conditions requires clinical evaluation, imaging, and professional medical assessment by a doctor.
Where can I find more information about the PGR gene?
You can find detailed information about the PGR gene and its functions on resources like the NCBI Gene database or MedlinePlus Genetics. These sites provide comprehensive summaries of gene function and related research.
Should I change my medication based on this genotype?
No. You should never change your medication or treatment plan based on genetic information without first discussing it with your clinician or pharmacist. They are the only ones qualified to interpret your health data in the context of your specific medical needs.
Sources & further reading
Educational information only, last refreshed 9/19/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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