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KRT6A gene

Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

KRT6A gene

The KRT6A gene provides instructions for producing keratin 6a, a protein essential for the structural integrity and resilience of skin, nails, and oral mucosa.

Normal Function

The KRT6A gene provides instructions for making a protein called keratin 6a or K6a. Keratins are a group of tough, fibrous proteins that form the structural framework of certain cells, particularly cells that make up the skin, hair, nails, and similar tissues. Keratin 6a is produced in the nails, the skin on the palms of the hands and soles of the feet, and the oral mucosa that lines the inside of the mouth.

Keratin 6a partners with a similar protein, keratin 16, to form molecules called keratin intermediate filaments. These filaments assemble into dense networks that provide strength and resilience to the skin, nails, and other tissues. Networks of keratin intermediate filaments protect these tissues from being damaged by friction and other everyday physical stresses. Keratin 6a is also among several keratins involved in wound healing.

Health Conditions Related to Genetic Changes

Pachyonychia congenita

About 40 mutations in the KRT6A gene have been identified in people with pachyonychia congenita, a rare condition that primarily affects the nails and skin. In most cases, this condition becomes apparent within the first few months of life. Most of these mutations change single protein building blocks (amino acids) in keratin 6a, while a few mutations add or delete a small number of amino acids.

The KRT6A gene mutations responsible for pachyonychia congenita change the structure of keratin 6a, preventing it from interacting effectively with keratin 16 and interfering with the assembly of the keratin intermediate filament network. Without this network, skin cells become fragile and are easily damaged, making the skin less resistant to friction and minor trauma. Consequences include:

  • Formation of severe, painful blisters and calluses, even from normal activities like walking.
  • Abnormal production of excess keratin by fragile skin cells in response to damage, which exacerbates skin problems.
  • Disrupted growth and function of other tissues, such as hair follicles and nails.

Other Names for This Gene

  • 56 cytoskeletal type II keratin
  • CK 6A
  • CK6A
  • CK6C
  • CK6D
  • cytokeratin 6A
  • cytokeratin-6A
  • K2C6A_HUMAN
  • K6A
  • K6C
  • K6D
  • keratin 6A, type II
  • keratin, epidermal type II, K6A

Genomic Location

The KRT6A gene is found on chromosome 12.

Frequently Asked Questions

mutation in the KRT6A gene alters the structure of the keratin 6a protein, preventing it from properly binding with keratin 16. This disruption stops the formation of the dense intermediate filament network that normally provides structural strength to skin cells. Without this internal scaffolding, the cells become fragile and easily damaged by minor friction or trauma, leading to the severe blisters, calluses, and nail thickening characteristic of the condition.
Pachyonychia congenita caused by KRT6A mutations is typically inherited in an autosomal dominant pattern. This means that a mutation in just one copy of the gene in each cell is sufficient to cause the disorder. If one parent has the condition, there is a 50 percent chance with each pregnancy that the child will inherit the mutation and develop the disease. However, some cases arise from new (de novo) mutations in the KRT6A gene that were not present in either parent.
Management focuses on minimizing friction and protecting fragile skin. Patients are advised to wear soft, padded, and well-fitted shoes to reduce pressure on the soles of the feet. Using protective padding or bandages on areas prone to blistering, such as the heels and toes, is essential. Topical treatments like keratolytic agents (e.g., urea cream) may be used to soften thickened skin and nails, while pain management strategies are often necessary to maintain mobility and quality of life.
Yes, genetic testing can confirm the diagnosis by identifying specific pathogenic variants in the KRT6A gene. This is particularly useful when clinical symptoms are ambiguous or when distinguishing between different types of pachyonychia congenita, as mutations in other keratin genes like KRT16, KRT6B, and KRT17 can cause similar phenotypes. Confirming the specific genetic cause helps in accurate prognosis and family counseling.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.