The CALCA gene gives your body instructions for making calcitonin and CGRP, two signaling proteins that help manage calcium balance, bone activity, pain signals, and blood vessel widening. If this gene does not work normally, these signals can be disrupted. This gene plays an important role in migraine biology because CGRP affects nerve activity and blood flow around the brain. That is why the CALCA gene is closely linked to newer migraine treatments that block the CGRP pathway.
What is a gene?
Genes are stretches of DNA that provide cells with instructions for making molecules or directing activities in the body. Some genes hold the code for proteins, which do much of the cell’s work. Others mainly regulate when certain processes take place, where they occur, and how strongly they operate. Taken together, genes affect how the body develops and works, and they can also shape how you respond to food, stress, or medications. For a deeper look at this topic, you can learn more in the LearnHub.
Overview
CALCAGene function
What if the gene works
The CALCA gene helps the body make calcitonin and a nerve signaling protein called CGRP. These signals help regulate calcium balance and support communication between nerves and blood vessels.
Risk
What if the gene does not work
Changes in the CALCA gene can range from milder to more severe and may reduce or alter production of calcitonin and CGRP, two signaling peptides. This can disrupt cell-to-cell signaling involved in calcium balance, blood vessel control, and pain signaling.
Treatment
What does that mean for your treatment
No CALCA-specific treatment or drug selection approach is currently established for people with a pathogenic variant in the CALCA gene. CALCA-related peptides, especially CGRP, are established drug targets in migraine care, but this reflects pathway targeting rather than variant-guided treatment.
Gene function
What if the gene works
In your body, the CALCA gene helps make small signaling messengers used by nerves and certain thyroid cells. Understanding what the CALCA gene does in the body helps explain how calcium signals, blood vessel tone, and nerve communication stay coordinated. Different tissues can use this gene to produce different messengers for these everyday jobs.
In thyroid cells, the CALCA gene helps produce calcitonin, a hormone that supports healthy calcium balance. Calcitonin can signal bone and kidneys to adjust how calcium is stored and released.
In sensory nerves, the CALCA gene helps produce CGRP, a messenger that helps blood vessels relax and widen. This supports normal blood flow and local responses to everyday changes such as heat or pressure.
CGRP from the CALCA gene helps nerve cells pass along signals between tissues and the nervous system. This supports normal sensation and quick communication in areas like the skin, face, and blood vessel walls.
Different tissues can read the CALCA gene in different ways, allowing one gene to make more than one signaling messenger. This helps the body match the message to the job in each tissue.
What is a variant?
A genetic variant is a minor difference in the DNA sequence within a gene. These differences are common and help shape normal human diversity, including variation in appearance, metabolism, and the way the body responds to environmental influences. Many variants do not lead to any noticeable effect and are simply part of natural genetic variation. In some situations, though, a variant can change how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CALCA gene can change how the cell splices RNA, the gene's working copy, or how the peptide is built, cut, and released. Variants in the CALCA gene that affect splicing and peptide processing may leave less usable peptide, create an unstable product, or alter how well it binds its target. Milder variants may partly reduce output, while more severe variants can greatly disrupt production or make the peptide nonfunctional.
How variants are linked to conditions
The CALCA gene does not yet have a broadly confirmed link to a specific health condition, and research on how CALCA gene variants are linked to conditions is still developing. Anyone with a confirmed variant in the CALCA gene should rely on their doctor or genetic counselor for guidance that fits their personal and family history.
A variant is not necessarily a diagnosis
Variants in genes are a routine part of human biology and are common throughout the general population. Most have no direct impact on health and simply reflect natural human diversity. For many genes, carrying a variant tied to a condition suggests a possible association rather than a definite diagnosis, especially when several genes and environmental factors play a role. 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 risks related to the CALCA gene. Anyone with concerns about their personal risk or family history should speak with a doctor or genetic counselor.
Inheritance of CALCA variants
Information on how CALCA gene variants are inherited is still limited, and there is not yet a broadly confirmed disease specific inheritance pattern for the CALCA gene in routine human genetics. As research develops, this picture may become clearer. The CALCA gene is located on chromosome 11, which is an autosome, so each person inherits one copy from each parent.
What does my CALCA result mean for my family?
There is not yet a broadly confirmed inherited pattern tied to a specific condition for the CALCA gene. If you have a CALCA result and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your exact finding and family history.
Genetic information
Genetic testing
How you find out about variants
CALCA genetic testing looks for variants in the CALCA gene using a blood sample, saliva sample, or a cheek swab. A lab reads the gene's DNA sequence and compares it with the usual reference sequence to see whether a variant is present. Results may identify a known variant, show no relevant variant, or find a change whose meaning is being clarified.
When should I consider getting a genetic test?
There is not yet a broadly established, CALCA-specific reason for genetic testing in routine care. Decisions about testing are usually based on your symptoms, family history, and whether a broader gene panel makes sense, with guidance from a doctor or genetic counselor.
A genetic result is only one part of your health story
Genetic findings can be informative, although the amount they reveal varies with the condition and the kind of variant present. Over time, how the body functions is also shaped by factors including age, medical history, environment, and lifestyle. For some conditions, particularly those affected by many genes, genetic information offers context rather than certainty and makes the most sense when considered with the rest of a person’s care. In other situations, it may give a clear answer. For topics such as medication response, genetic results can also help put personal experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how your body handles medicines, so the same treatment may work differently from one person to another. Some gene changes influence how quickly a drug is broken down or how strongly the body responds to it. This can shape how well a medicine works and how likely someone is to notice side effects.
What is Pharmacogenetics?
Pharmacogenetics examines how genetic differences affect the way people respond to medications. By looking at connections between genes and drugs, it helps explain why the same treatment may work differently from one person to another. For many medicines, genes influence how strongly a drug works or how the body handles it. This information can support treatment decisions that are more informed and more individualized. To explore this subject in greater detail, you can learn more in the LearnHub.
Drugs influenced by the CALCA gene
When should I seek medical advice?
There isn't yet a broadly confirmed role for this gene in predicting medication response, so questions about medicines, side effects, or treatment changes are best discussed with your doctor.
History
Calcitonin first drew medical interest in the 1960s, when researchers identified it as a hormone linked to calcium balance. In later years, work on the CALCA gene showed that one gene could give rise to different peptide products in different tissues, an important step in understanding how genes are read in the body. From these first observations, research expanded steadily. Studies in the 1980s and 1990s connected CALCA-related peptides to pain pathways, blood vessel control, and thyroid C cell biology. That history also helped establish calcitonin as a useful clinical marker in medullary thyroid cancer. More recently, growing interest in CGRP brought renewed attention to the CALCA gene in migraine research.