The RLN3 gene gives your body instructions for making relaxin 3, a small chemical messenger used mainly in the brain. This gene plays an important role in signaling that helps regulate stress responses, appetite, alertness, and sleep. If it does not work as expected, these brain pathways may function differently. Researchers are studying whether some RLN3 variants may influence mood, eating patterns, or other brain related traits.
What is a gene?
A gene is a section of DNA that holds instructions your cells use to make molecules or regulate activities in the body. Some genes provide the directions for producing proteins, which are the active parts of cells. Others mainly guide when certain processes happen, where they happen, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you respond to food, stress, or medicines. To look into this topic more closely, you can find more in the LearnHub.
Overview
RLN3Gene function
What if the gene works
The RLN3 gene helps make relaxin-3, a signaling protein used mainly in the brain. It supports communication between nerve cells involved in stress responses, alertness, feeding, and sleep and wake patterns.
Risk
What if the gene does not work
Changes in the RLN3 gene can reduce or alter relaxin 3, a brain signal that helps nerve cells communicate. Milder variants may slightly affect signaling, while more severe variants can disrupt receptor activation and nerve circuit activity.
Treatment
What does that mean for your treatment
No RLN3-specific treatment or management approach is currently established for people with a pathogenic or loss-of-function variant in the RLN3 gene. The RLN3 gene is being studied as part of brain signaling pathways linked to stress, feeding, and mood, but this work has not led to guideline-based drug choices.
Gene function
What if the gene works
In the brain, the RLN3 gene helps certain nerve cells communicate using a small signaling protein called relaxin-3. This is part of the normal function of the RLN3 gene in the brain. The signal helps keep connected brain circuits coordinated during everyday control of alertness, internal body cues, and stress responses.
The RLN3 gene gives certain brain cells instructions to make relaxin-3, a small messenger protein. The protein is stored and released so nerve cells can pass signals across brain networks.
Relaxin-3 sends its message mainly by attaching to the RXFP3 receptor, a receiving protein on other nerve cells. This changes how active those cells are and helps tune the flow of information.
RLN3 signaling helps connected brain pathways stay coordinated and flexible. In daily life, this supports steady control of alertness, response to stress, and other routine body signals.
What is a variant?
A genetic variant is a small alteration in the DNA sequence of a gene. These changes are common and help shape normal human diversity, including differences in appearance, metabolism, or the way the body responds to environmental influences. Many variants do not have any noticeable effect and simply represent natural genetic variation. In some situations, though, a variant can change how a gene functions more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the RLN3 gene can change how the relaxin-3 signal is made, processed, or released by nerve cells. Milder variants may slightly alter the peptide's shape or lower how much is produced. More severe variants can shorten the peptide, disrupt the RNA message, or markedly reduce secretion and receptor binding. This is how RLN3 variants affect the gene's function at a cellular level.
How variants are linked to conditions
Variants in the RLN3 gene do not yet have a broadly confirmed link to a specific health condition, and current understanding of how RLN3 variants are linked to conditions may change as research develops. Anyone with a confirmed RLN3 gene finding should rely on guidance from their doctor or genetic counselor for personal interpretation.
A variant is not necessarily a diagnosis
Genetic variants are a routine part of human biology and are widely seen in the general population. Most do not have a direct effect on health and instead represent natural variation among people. For many genes, carrying a variant associated with a condition suggests a possible link rather than a definite diagnosis, especially when several genes and environmental factors also contribute. In some situations, though, a single well characterized variant in a specific gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the RLN3 gene. Anyone with questions about personal or family risk can talk with a doctor or genetic counselor.
Inheritance of RLN3 variants
There is not yet a broadly confirmed Mendelian inheritance pattern for RLN3 gene variants tied to a specific human condition, so the answer to how RLN3 gene variants are inherited remains limited to general genetics rather than a single established dominant, recessive, or X linked pattern. The RLN3 gene is located on chromosome 19, which is an autosome, so you inherit one copy from each parent. In general, changes in autosomal genes can be passed down through either side of the family.
What does my RLN3 result mean for my family?
There is not yet a broadly confirmed inheritance pattern tied to a specific health condition for the RLN3 gene, though this can change as research develops. If you have a specific RLN3 result and want to understand what it could mean for your relatives, a doctor or genetic counselor can help explain it in the context of your family history.
Genetic information
Genetic testing
How you find out about variants
RLN3 genetic testing looks for changes in the RLN3 gene using a blood or saliva sample. To find RLN3 gene variants, labs usually read the gene’s DNA sequence as part of a multigene panel, exome, or genome test, then classify any variant based on current medical evidence.
When should I consider getting a genetic test?
There isn’t yet a broadly established RLN3-specific clinical reason for genetic testing. Decisions about testing are best made with a doctor or genetic counselor based on your symptoms, medical history, and family history.
A genetic result is only one part of your health story
Genetic test results can be informative, but how much they reveal varies based on the condition and the specific type of variant. Over time, how the body functions is also shaped by factors like lifestyle, environment, age, and medical history. For some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is best considered alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas like medication response, genetic results can help put personal experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. Small differences in DNA can change how the body absorbs, breaks down, or responds to a drug, so the same treatment may work well for one person but less well for another. This is common and can influence both how helpful a medicine is and how sensitive someone may be to side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. It looks at connections between genes and drugs to help explain why the same treatment can work differently from one person to another. For many medicines, genes influence either how strongly a drug works or how the body processes it. This information can help support more informed and individualized treatment decisions. More about this topic is available in the LearnHub.
Drugs influenced by the RLN3 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen, so concerns about side effects, new symptoms, or treatment changes are best discussed with your doctor.