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FZD6 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

FZD6 gene

The FZD6 gene provides instructions for making the frizzled-6 protein, which plays a critical role in cell signaling and the development of nails and hair.

Normal Function

The FZD6 gene provides instructions for making a protein called frizzled-6. This protein is embedded in the outer membrane of cells, where it is involved in transmitting chemical signals from outside the cell to the cell's nucleus.

Specifically, frizzled-6 participates in the Wnt signaling pathway, a series of steps that affect the way cells and tissues develop. Wnt signaling is important for cell division (proliferation), attachment of cells to one another (adhesion), cell movement (migration), and many other cellular activities. At the cell surface, frizzled-6 attaches (binds) to certain proteins, which triggers the frizzled-6 protein to send signals into the cell and initiate the Wnt signaling pathway.

Frizzled-6 is active in many tissues. During early development, it plays a critical role in the growth and development of nails, particularly the attachment of the nail to the nail bed. Studies suggest that frizzled-6 is also involved in hair growth.

Health Conditions Related to Genetic Changes

Nonsyndromic congenital nail disorder 10

At least three mutations in the FZD6 gene have been found to cause nonsyndromic congenital nail disorder 10. This condition is characterized by abnormally thick fingernails and toenails that may appear claw-like.

The mutations lead to the production of a frizzled-6 protein that cannot get to the cell membrane where it is needed or that cannot transmit signals into the cell. As a result, Wnt signaling is disrupted and the growth and development of nails is poorly regulated, which leads to separation of the nail from the underlying nail bed (onycholysis) and other abnormalities of the fingernails and toenails.

Other Names for This Gene

  • frizzled 6, seven transmembrane spanning receptor
  • frizzled family receptor 6
  • frizzled homolog 6
  • FZ-6
  • FZ6
  • HFZ6

Frequently Asked Questions

Nails affected by this disorder are typically abnormally thickened and may appear claw-like or curved. A key feature is onycholysis, which is the separation of the nail plate from the underlying nail bed. This separation can lead to a gap under the nail, which may trap debris or increase the risk of secondary fungal or bacterial infections. The condition usually affects both fingernails and toenails, and the thickening can make the nails difficult to trim and may cause discomfort or pain during daily activities. Does this nail disorder affect hair growth or other parts of the body?::Nonsyndromic congenital nail disorder 10 is called "nonsyndromic" because it primarily affects the nails without causing significant abnormalities in other body systems. While the FZD6 gene is involved in hair growth signaling, mutations causing this specific disorder do not typically lead to hair loss, scalp abnormalities, or other systemic issues like kidney or heart problems. The clinical presentation is generally limited to the structural changes in the nails, distinguishing it from other genetic syndromes that involve multiple organ systems. How is the diagnosis of this condition confirmed, and is genetic testing necessary?::Diagnosis is often initially made based on the clinical appearance of the nails and a family history of similar symptoms. However, because the nail changes can resemble other conditions like fungal infections or psoriasis, a dermatologist may perform a nail biopsy or rule out infectious causes. Definitive diagnosis can be confirmed through genetic testing that identifies specific mutations in the FZD6 gene. This is particularly useful if the family history is unclear or if the presentation is atypical, as it helps distinguish this genetic disorder from acquired nail conditions. What are the long-term management options for individuals with this nail disorder?::Management is primarily supportive and focuses on maintaining nail health and preventing complications. This includes regular, careful trimming of the thickened nails to prevent ingrown nails or pain. Keeping the nails and surrounding skin clean and dry is crucial to prevent secondary infections, especially in the areas where the nail has separated from the bed. Topical antifungal or antibiotic treatments may be used if secondary infections occur. There is currently no medication that reverses the genetic defect, so the focus remains on cosmetic management and preventing secondary health issues related to nail trauma or infection.
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.

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