The CALCR gene gives your cells instructions for a receptor that responds to calcitonin, a hormone that helps control calcium levels and slows the breakdown of bone. If this receptor does not work properly, calcium balance and normal bone remodeling can become less controlled, which may influence bone density over time. This gene plays an important role in how bone, kidney, and some nerve cells respond to signals that help keep minerals in balance. Most CALCR variants have little effect, but some are being studied for links to bone health and a few other conditions.
What is a gene?
Genes are sections of DNA that carry instructions your cells use to make molecules or regulate processes throughout the body. Some genes provide the code for proteins, which are the parts of cells that do much of the work. Others mostly help direct 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, and medications. To go into this topic in greater detail, you can find more in the LearnHub.
Overview
CALCRGene function
What if the gene works
The CALCR gene helps cells respond to calcitonin, a hormone that supports calcium balance. This signaling helps regulate bone turnover and can reduce the release of calcium from bone into the blood.
Risk
What if the gene does not work
Changes in the CALCR gene can range from milder to more severe variants and may partly or strongly reduce calcitonin receptor signaling. This can weaken cell responses that help control calcium handling and bone remodeling.
Treatment
What does that mean for your treatment
No CALCR-specific treatment or management approach is currently established for people with a pathogenic variant in the CALCR gene. CALCR is being studied as a possible biomarker and drug target in some cancers and in bone-related research.
Gene function
What if the gene works
Your body uses the CALCR gene to respond to calcitonin, a hormone that helps keep calcium levels steady. This signaling is part of how the CALCR gene supports calcium balance in the body, especially through its effects on bone turnover and kidney handling of minerals.
The CALCR gene makes a receptor on the cell surface that recognizes calcitonin. When calcitonin attaches, the cell receives a clear signal to adjust calcium handling.
In bone, this receptor helps control osteoclasts (cells that break down old bone). That keeps normal bone remodeling more balanced from day to day.
In the kidneys, CALCR signaling helps fine tune how calcium and phosphate are handled. This supports steady mineral levels in the blood and urine.
What is a variant?
A genetic variant is a slight difference in the DNA sequence within a gene. These differences are common and are part of normal human diversity, including differences in appearance, metabolism, and the way the body responds to environmental influences. Many do not have any noticeable effect and simply represent natural genetic variation. In some cases, though, a variant changes how a gene works more substantially and can contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CALCR gene can alter the calcitonin receptor’s shape, stability, or ability to reach the cell surface, which may weaken cell signaling. Some CALCR gene variants have mild effects and only partly reduce receptor activity, while more severe variants can markedly impair ligand binding or leave little functional receptor available. This explains how CALCR variants affect receptor function at a molecular level.
How variants are linked to conditions
Variants in the CALCR gene do not yet have a broadly confirmed link to a specific health condition, although research on CALCR gene variants and health conditions is still developing. If you carry a reported CALCR variant or have a confirmed CALCR-related diagnosis, your doctor or genetic counselor can interpret that result in the context of your personal and family history.
A variant is not necessarily a diagnosis
Genetic variants are common across the general population and are a normal part of human biology. Most do not directly affect health and simply reflect natural differences among people. For many genes, having a variant associated with a condition points to a possible link rather than a clear diagnosis, particularly when several genes and environmental influences are involved. Still, in some situations, one well understood variant in a particular gene is 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 CALCR gene. Overall risk is usually shaped by many genes together, along with things like age, hormones, diet, activity level, and other health conditions.
Inheritance of CALCR variants
There is not yet a broadly confirmed, disease-specific Mendelian pattern for how CALCR gene variants are inherited, so the CALCR gene inheritance picture remains uncertain and may become clearer as research develops. CALCR is located on chromosome 7, which is an autosome rather than a sex chromosome. That means you inherit one copy of the CALCR gene from your mother and one copy from your father, and inheritance is generally the same for males and females.
What does my CALCR result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific health condition for CALCR, though this understanding can change as research develops. If you have a specific CALCR result and questions about what it could mean for your family, a doctor or genetic counselor can explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
Finding out whether you carry a variant in the CALCR gene usually involves genetic testing using a blood sample or saliva. CALCR genetic testing reads the DNA code in the gene, often as part of a larger panel or exome test, to look for changes. Results may show a variant, no variant, or a variant of uncertain significance.
When should I consider getting a genetic test?
There isn't yet a widely accepted, CALCR-specific reason for genetic testing in routine care. Testing decisions are usually based on your symptoms, medical history, and family history, with guidance from a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic result can provide meaningful insight, but how much it reveals varies by the condition and the type of variant involved. Lifestyle, environment, age, and medical history are among the factors that shape how the body functions over time. In some conditions, especially those influenced by many genes, genetic information provides context rather than certainty and is most useful when considered alongside other parts of care. In other situations, a genetic result can offer a clear answer. In areas like medication response, these results can also help put individual experiences into context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. One person may break down a drug more slowly or more quickly than another, or their body may be more or less sensitive to its effects. This is common and can influence how well a treatment works or how likely side effects are.
What is Pharmacogenetics?
Pharmacogenetics looks at how genetic differences shape a person’s response to medications. It studies the relationship between genes and drugs to help explain why the same treatment may work differently in different people. For many medicines, genes can affect both how strongly a drug works and how the body handles it. This information can help support more informed, more personalized treatment decisions. You can read more about this topic in the LearnHub.
Drugs influenced by the CALCR gene
When should I seek medical advice?
There is not yet a broadly confirmed role for changes in this gene in guiding medication decisions, so questions about treatment, side effects, or your overall health are best discussed with your doctor.
History
Calcitonin itself was identified in the 1960s during efforts to understand how the body regulates calcium, and this set the stage for work on the CALCR gene. Researchers later showed that cells needed a specific receptor to respond to this hormone, which led to the identification and cloning of the CALCR gene in the early 1990s. Initially understood only through hormone response studies, later recognized as tied to a specific gene, CALCR became part of a broader wave of receptor discoveries. From these first observations, research expanded steadily. The gene’s history is mainly linked to advances in bone and mineral research rather than to a single public story, but it helped clarify how hormone signals were being received at the cell surface.