NOD2 rs2066847: What Your Genotype Means
The rs2066847 variant, also known as 3020insC or Leu1007fsinsC, is a specific insertion mutation within the NOD2 gene. It is widely recognized as one of the most significant genetic risk factors associated with an increased susceptibility to Crohn's disease.
What each genotype means
Increased Crohn's disease risk
This genotype indicates you carry one copy of the 3020insC (Leu1007fs) variant. Research indicates that carriers of this variant have an increased statistical susceptibility to developing Crohn's disease, particularly with ileal involvement or stricturing phenotypes.
Carried by a small percentage of individuals of European ancestry; it is rare in East Asian and African populations.
High Crohn's disease risk
This genotype indicates you carry two copies of the 3020insC (Leu1007fs) variant. Studies have shown that individuals with this homozygous genotype have a significantly higher statistical risk for Crohn's disease and may be more likely to experience an aggressive clinical course, such as the development of fistulas or stenoses.
This genotype is very rare, observed primarily in individuals of European descent.
Understanding the rs2066847 Variant
The rs2066847 variant is a single-base insertion of a cytosine (C) nucleotide located within exon 11 of the NOD2 gene on chromosome 16. This specific insertion causes a frameshift mutation, which alters the reading frame of the genetic code during protein synthesis. Consequently, this leads to the production of a truncated, or shortened, version of the NOD2 protein. Because the protein is incomplete, it cannot function as intended within the cell. This variant is frequently referred to in scientific literature as 3020insC or p.Leu1007fsX1008. It is one of several identified mutations in the NOD2 gene that have been extensively studied for their impact on human health, particularly regarding inflammatory conditions of the gastrointestinal tract.
The Role of the NOD2 Gene
The NOD2 gene provides instructions for making a protein that acts as an intracellular receptor for bacterial components. This protein is primarily expressed in immune cells, such as monocytes, and plays a critical role in the body's innate immune response. When the NOD2 protein detects fragments of bacteria, it triggers a signaling pathway that activates NF-κB, a protein complex that controls the transcription of DNA and regulates the immune response to infection. By activating this pathway, the NOD2 protein helps the body recognize and respond to harmful pathogens. When the protein is truncated due to a mutation like rs2066847, the cell's ability to properly detect these bacterial triggers and mount an appropriate inflammatory response is compromised, which is thought to contribute to the chronic inflammation observed in conditions like Crohn's disease.
Research and Disease Association
Extensive research has established a strong statistical association between the rs2066847 variant and Crohn's disease. Studies have consistently shown that individuals carrying this variant have a significantly higher risk of developing the condition compared to those who do not. The evidence is considered robust, with multiple meta-analyses and genome-wide association studies (GWAS) confirming its role as a major susceptibility locus. Beyond general susceptibility, some research suggests that carriers of this variant may be more prone to specific disease phenotypes, such as small bowel involvement, fibrostenotic disease, or fistulizing complications. However, it is important to note that carrying this variant does not guarantee the development of Crohn's disease. Many individuals with the variant remain healthy, indicating that other genetic, environmental, and lifestyle factors are necessary for the disease to manifest.
Population Frequency
The frequency of the rs2066847 variant varies significantly across different ancestral populations. It is most commonly observed in individuals of European descent, where the minor allele frequency is approximately 0.02 to 0.07 depending on the specific population studied. Conversely, this variant is reported to be rare or entirely absent in populations of East Asian and African ancestry. Because the distribution of this genetic risk factor is not uniform globally, the clinical relevance of testing for this variant is highly dependent on an individual's ancestral background. Researchers continue to study these population differences to better understand the evolutionary history of the variant and its impact on health across diverse groups.
Interpreting Your Genetic Information
If you have received information about your rs2066847 genotype, it is essential to understand that this is not a diagnostic test for Crohn's disease. Genetic associations represent statistical probabilities rather than medical certainties. Many people who carry the risk allele never develop the disease, and many people with Crohn's disease do not carry this specific variant. This information should not be used to make personal health decisions or to predict future health outcomes without professional guidance. If you are concerned about your risk for inflammatory bowel disease or have symptoms such as persistent abdominal pain, diarrhea, or weight loss, you should consult with a gastroenterologist or a qualified healthcare provider. They can evaluate your clinical history and determine if further diagnostic testing is appropriate for your specific situation.
How common is this variant?
The rs2066847 variant has a minor allele frequency of approximately 0.02 to 0.07 in European populations, while it is rare or absent in East Asian and African ancestries.
Frequently asked questions
Does having the rs2066847 variant mean I will get Crohn's disease?
No, having this variant does not mean you will develop Crohn's disease. It is a risk factor, meaning it increases the statistical likelihood of the disease, but it is not a direct cause on its own.
Can I be tested for the rs2066847 variant?
Yes, this variant can be identified through genetic testing. However, such testing is typically performed in a clinical setting to help doctors understand a patient's risk profile when symptoms are already present.
What should I do if I know I have the rs2066847 variant?
If you are aware you carry this variant, there is no specific action required other than maintaining a healthy lifestyle. If you have concerns about your health or family history, discuss them with a doctor or a genetic counselor.
Is rs2066847 the only genetic cause of Crohn's disease?
No, Crohn's disease is a complex, multifactorial condition involving many different genes and environmental factors. The rs2066847 variant is just one of many genetic markers associated with the disease.
Sources & further reading
Educational information only, last refreshed 9/20/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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