The KRT73 gene helps make a keratin protein that supports the inner structure of hair follicles and the shape of growing hair. This gene plays an important role in keeping hair strands and the tissue around them strong as they form. If the gene does not work properly, hair may grow differently or be more fragile, depending on the variant. KRT73 is mainly known through research on hair biology rather than public health stories.
What is a gene?
A gene is a stretch of DNA that gives your cells instructions for making molecules or regulating processes in the body. Some genes provide the code for proteins, the working parts of cells. Others mainly guide when certain processes take place, where they happen, and how strongly they run. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a deeper look at this topic, you can find more in the LearnHub.
Overview
KRT73Gene function
What if the gene works
The KRT73 gene helps make a keratin protein used in the hair follicle. It supports the inner root sheath, the part of the follicle that helps guide and shape growing hair.
Risk
What if the gene does not work
In hair follicles, changes in the KRT73 gene can weaken the keratin framework that helps inner root sheath cells keep growing hairs supported and shaped. Milder and more severe variants may reduce this support to different degrees.
Treatment
What does that mean for your treatment
No KRT73-specific treatment or drug selection approach is currently established for people with a pathogenic or loss-of-function variant in the KRT73 gene; care is based on managing the hair changes rather than changing medications because of this gene.
Gene function
What if the gene works
Inside each hair follicle, the KRT73 gene helps make a sturdy protein used in the inner root sheath, the layer that surrounds a growing hair. This protein gives those cells strength and shape. It is part of how the KRT73 gene helps hair growth stay organized as the hair shaft moves upward.
KRT73 joins other keratin proteins to form intermediate filaments (tiny support strands inside cells). These strands give inner root sheath cells the firmness they need during hair formation.
In the inner root sheath, this protein helps cells build a tough, supportive layer around the growing hair. That layer keeps close contact with the hair shaft as it moves through the follicle.
By supporting the inner root sheath, KRT73 helps guide the hair shaft in a controlled path as it grows. This contributes to the orderly shape and position of developing hair within the follicle.
What is a variant?
A genetic variant is a slight change in a gene’s DNA sequence. These changes are common and are part of normal human diversity, including differences 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 more significantly change how a gene functions and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the KRT73 gene can change the shape or stability of keratin 73, which may weaken how this structural protein fits into the inner root sheath of hair follicles. This helps explain how KRT73 gene variants affect protein function at a cellular level. Milder variants may partly disrupt filament assembly or protein pairing, while more severe variants can greatly reduce the amount of usable protein or prevent normal assembly altogether.
How variants are linked to conditions
Current evidence suggests the KRT73 gene does not yet have a broadly confirmed link to a specific health condition, so information on KRT73 gene variants linked to conditions is still evolving. Anyone with a reported KRT73-related finding should rely on advice from their doctor or genetic counselor for personal interpretation.
A variant is not necessarily a diagnosis
Genetic variants are common in the general population and are a normal part of human biology. Most do not directly affect health and simply contribute to natural human diversity. For many genes, carrying a variant associated with a condition suggests a possible link rather than a confirmed diagnosis, especially when several genes and environmental factors are involved. In some situations, though, a single well-characterized variant in a specific 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 KRT73 gene. If a change in KRT73 is found, its effects can depend on the exact genetic change and family history, and a doctor or genetic counselor can help explain what that may mean for you.
Inheritance of KRT73 variants
There is not yet a broadly confirmed disease-specific inheritance pattern for the KRT73 gene, so how KRT73 gene variants are inherited in people is still being clarified. The KRT73 gene is located on chromosome 12, which is an autosome. This means you inherit one copy from your mother and one copy from your father, and any health effect would depend on the particular variant and whether one or both copies are involved.
What does my KRT73 result mean for my family?
There isn't yet a broadly confirmed inheritance pattern tied to a specific condition for the KRT73 gene, though this understanding can change as research develops. If you have a specific KRT73 result and questions about what it could mean for your family, a doctor or genetic counselor can give guidance tailored to your situation.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the KRT73 gene, genetic testing uses a blood or saliva sample, which a lab reads to look for DNA changes. This is how genetic testing for KRT73 variants works, and results may show a known variant, no variant, or a change whose meaning is still unclear.
When should I consider getting a genetic test?
There is not yet a broadly established reason to order genetic testing specifically for the KRT73 gene. Testing decisions are usually based on your symptoms and family history and are best discussed with a doctor or genetic counselor.
A genetic result is only one part of your health story
A genetic result can provide valuable insight, but how much it reveals varies by the condition and the kind of variant involved. Many other factors, including lifestyle, environment, age, and medical history, also 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 viewed alongside other parts of care. In other situations, a genetic result may offer a clear answer. In areas such as medication response, genetic 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. Small differences in DNA can change how the body breaks down a drug, moves it through the bloodstream, or responds to it at its target. This helps explain why the same treatment works well for one person, has less effect in another, or causes more side effects in someone else.
What is Pharmacogenetics?
Pharmacogenetics examines how differences in a person’s genes can affect the way they respond to medicines. It studies gene drug relationships to help explain why the same treatment may work differently in different people. For many drugs, genes can influence both how the body handles a medicine and how much effect it has. This information can support better informed, more personalized treatment choices. More detail is available in the LearnHub.
Drugs influenced by the KRT73 gene
When should I seek medical advice?
There is not yet a broadly confirmed role for this gene in guiding how medicines are chosen or used, so any concerns about side effects, new symptoms, or how well a treatment is working are best discussed with your doctor.
History
KRT73 entered the scientific literature during the broader effort to map the many keratin genes involved in hair formation. It was identified as one of several specialized hair follicle keratins, helping researchers sort out how different layers of the follicle use different structural proteins. Initially understood only through visible traits, later recognized as tied to a specific gene, this area of research became clearer as gene mapping and sequencing improved in the late 20th and early 21st centuries. KRT73 has remained mainly a research gene rather than one widely known through public awareness campaigns or major medical news stories. Its history is best seen as part of the larger scientific work that clarified how the hair follicle is built and maintained.