The NTRK1 gene gives cells instructions for a receptor that responds to nerve growth factor, helping certain nerve cells develop and stay healthy. This gene plays an important role in sensing pain and temperature and in controlling sweating. If the NTRK1 gene does not work properly, a person may have very little pain sensation and may not sweat enough, which can lead to unnoticed injuries and overheating. Some acquired NTRK1 variants in tumors can also help drive cancer growth.
What is a gene?
A gene is a stretch of DNA that carries instructions cells use to make molecules or manage activities in the body. Some genes provide the directions for producing proteins, which are the functional parts of cells. Others are mainly involved in regulating when certain processes happen, where they take place, and how active they are. Taken together, genes affect how the body grows and works, and they can influence how you react to food, stress, or medications. More detailed information on this topic is available in the LearnHub.
Overview
NTRK1Gene function
What if the gene works
The NTRK1 gene helps certain nerve cells grow, survive, and communicate. It is especially important for nerves that sense pain and temperature and for nerves that help control sweating and other automatic body functions.
Risk
What if the gene does not work
When the NTRK1 gene does not work properly, people can have reduced pain sensation and trouble sweating, often from infancy. Milder to more severe variants can change when signs appear and how strongly pain and temperature nerves are affected.
Treatment
What does that mean for your treatment
No NTRK1-specific treatment or drug-selection approach is currently established for inherited pathogenic or loss-of-function variants in the NTRK1 gene. In cancer care, activated NTRK1 fusions, which are different from loss-of-function variants, can guide use of TRK inhibitors such as larotrectinib or entrectinib.
Conditions associated with NTRK1
Gene function
What if the gene works
Some of the nerves you rely on to feel a hot stove or regulate sweating depend on the NTRK1 gene. It helps certain nerve cells receive growth signals and use them to grow, mature, and keep working as they should. This helps explain what the NTRK1 gene does in the nervous system, especially for pain sensing and automatic body control.
The NTRK1 gene helps certain nerve cells detect nerve growth factor, a natural body signal that supports nerve development. That signal helps the cells grow, finish developing, and stay healthy over time.
It supports the development and upkeep of sensory nerves that carry pain and temperature signals. These are the nerves that help you notice things like a pinprick or a hot pan.
It also helps build and maintain sympathetic nerves, which manage automatic body functions. These nerves contribute to sweating, blood vessel tone, and other responses that happen without conscious effort.
What is a variant?
A genetic variant is a minor difference in the DNA sequence of a gene. These differences are common and are part of normal human diversity, such as variation in appearance, metabolism, or how 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 sometimes cause, a genetic condition.
Genetic variants
What if the gene does not work
Variants in the NTRK1 gene can weaken or shut down signals needed for nerve cells to develop and survive. This explains how NTRK1 gene variants affect nerve growth signaling: some changes reduce receptor delivery to the cell surface, while others impair nerve growth factor binding or kinase activity (the signal step). Milder variants may leave some signaling intact, while more severe variants can nearly abolish it and are often linked to earlier features of congenital insensitivity to pain with anhidrosis.
How variants are linked to conditions
Pathogenic variants in the NTRK1 gene cause congenital insensitivity to pain with anhidrosis, also called CIPA or hereditary sensory and autonomic neuropathy type IV. This rare inherited condition is present from birth, and finding pathogenic variants in both copies of the NTRK1 gene can confirm the diagnosis. Separately, acquired NTRK1 gene fusions in tumor cells are linked to some cancers, but these are not the same as inherited NTRK1-related CIPA.
A variant is not necessarily a diagnosis
Genetic variants are a usual part of human biology and are common across the general population. Most do not have a direct effect on health and simply reflect natural human variation. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when more than one gene and environmental factors are involved. In some situations, though, a single well-characterized variant in a particular gene is enough to confirm a diagnosis.
Are there things that can increase or change my risk?
For NTRK1, the main risk comes from inheritance rather than lifestyle. A child’s chance of having an NTRK1-related condition is much higher when both parents carry a harmful change in the gene, and this is more likely when parents are blood relatives. Daily habits do not meaningfully change whether someone is born with the condition.
Inheritance of NTRK1 variants
For families asking how NTRK1 variants are inherited, the well established pattern is autosomal recessive. This means a person usually develops an NTRK1-related condition only if they inherit two disease-causing variants in the NTRK1 gene, one from each parent. Parents who each carry one variant are usually unaffected carriers, and with each pregnancy they have a 25% chance of having an affected child, a 50% chance of having a child who is also a carrier, and a 25% chance of having a child with neither variant. Sons and daughters are affected at the same rate.
What does my NTRK1 result mean for my family?
Changes in the NTRK1 gene are best known for causing a rare inherited condition in a recessive pattern, so family members may be healthy carriers without knowing it. Brothers and sisters of someone with a disease-causing NTRK1 result may also be affected or may be carriers. Parents are usually carriers, and other relatives on either side of the family may carry the same gene change.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a change in the NTRK1 gene, doctors use NTRK1 genetic testing, usually on a blood or saliva sample. A lab reads the gene’s DNA sequence to look for variants and may compare the result with symptoms and family history to see whether a variant is likely to explain a person’s condition.
When should I consider getting a genetic test?
Genetic testing for the NTRK1 gene may be worth considering when a child does not feel pain normally, has very little sweating, gets repeated injuries without noticing, or has unexplained high fevers. It can also help when this condition runs in the family or when parents want to understand the chance of it affecting another child.
A genetic result is only one part of your health story
A genetic finding can provide useful insight, but how much it explains varies based on the condition and the type of variant involved. Many factors, including lifestyle, environment, age, and medical history, influence how the body works over time. For some conditions, especially those shaped by many genes, genetic information provides context rather than certainty and is best understood together with other parts of care. In other situations, a genetic result can give a clear answer. In areas such as medication response, genetic results may help place a person’s individual experiences in 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 reacts to a drug. This is common and helps explain why the same treatment works well for one person but less well for another. It can also influence how sensitive someone is to side effects or how strongly a medicine works.
What is Pharmacogenetics?
Pharmacogenetics is the area of study focused on how genetic differences affect the way people respond to medications. It examines links between genes and drugs to help explain why the same treatment can work differently in different people. With many medicines, genes influence either how powerfully a drug works or how the body handles it. This information can support treatment decisions that are more informed and more tailored to the individual. More detail on this topic is available in the LearnHub.
Drugs influenced by the NTRK1 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in routine inherited medicine-response decisions, so questions about symptoms, treatment, or side effects are best discussed with your doctor. NTRK1 is more often relevant in cancer care, where changes in a tumor involving NTRK1 can help guide the use of certain targeted treatments.
History
NTRK1 entered medical history through two different paths that later converged. In the 1980s, cancer researchers identified a related altered form, TRK, in tumor samples, which drew early scientific attention to this gene family. From these first observations, research expanded steadily. In the 1990s, inherited variants in the NTRK1 gene were linked to congenital insensitivity to pain with anhidrosis, a rare condition in which people do not feel pain normally and have trouble sweating. That finding gave doctors and families a clear genetic explanation for a puzzling clinical picture. Later, the discovery of NTRK gene fusions in several cancers made NTRK1 part of a broader shift toward tumor testing and gene targeted treatment.