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RSPO4 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

RSPO4 gene

The RSPO4 gene provides instructions for making the R-spondin-4 protein, which is essential for nail development and the regulation of the Wnt signaling pathway.

Normal Function

The RSPO4 gene provides instructions for making a protein called R-spondin-4. This protein plays a role in the Wnt signaling pathway, a series of steps that affect how cells and tissues develop. Wnt signaling is important for cell division, cell adhesion, cell migration, and many other cellular activities. The primary role of R-spondin-4 is to increase Wnt signaling.

During early development, Wnt signaling plays a critical role in the growth and development of nails. R-spondin-4 is active in the skeleton and contributes to limb formation, particularly at the ends of the fingers and toes, where nail development occurs.

Different regions (domains) of R-spondin-4 have different functions; two regions known as furin-like domains are required for activating and stabilizing proteins that play integral roles in the Wnt pathway.

Health Conditions Related to Genetic Changes

Anonychia congenita

At least 17 mutations in the RSPO4 gene have been found to cause anonychia congenita. This condition is characterized by the absence of fingernails and toenails (anonychia) from birth.

  • Nearly all RSPO4 mutations that cause this condition affect the furin-like domains, impairing protein function.
  • Some mutations disrupt the structure of the furin-like domains, while others lead to the production of an abnormally short protein that does not contain these domains.
  • As a result, R-spondin-4 cannot participate in the Wnt signaling pathway, causing nails to develop improperly or not at all.

Other Names for This Gene

  • C20orf182
  • CRISTIN4
  • dJ824F16.3
  • hRspo4
  • R-spondin family, member 4
  • roof plate-specific spondin-4

Frequently Asked Questions

nonychia congenita is a rare genetic condition where fingernails and toenails are absent from birth due to a failure in nail development during fetal growth. It differs from acquired nail loss, which results from trauma, infections, or systemic diseases like psoriasis or thyroid disorders. In anonychia congenita, the nail matrix is either absent or non-functional from the start, so nails never form. It is not caused by external factors and is not contagious.
nonychia congenita is generally not painful. The absence of nails does not typically cause pain or discomfort in the fingers or toes. However, the lack of nail protection can make the fingertips and toes more susceptible to minor injuries, dryness, or cracking of the skin. Patients may need to take extra care to keep the skin moisturized and protected from trauma, but the condition itself does not lead to chronic pain or functional impairment of the digits.
Diagnosis is primarily clinical, based on the physical examination showing the absence of nails from birth and a family history of the condition. However, genetic testing is increasingly used to confirm the diagnosis, especially in cases where the cause is unclear or to distinguish it from other syndromes that include nail abnormalities. Testing for mutations in the RSPO4 gene can provide a definitive diagnosis and help with genetic counseling for family planning. Genetic testing is recommended if there is a family history or if the presentation is atypical.
Yes, individuals with anonychia congenita can use artificial nails, prosthetic nails, or nail wraps for cosmetic purposes. These can be applied using adhesives or other attachment methods. However, because the natural nail plate is absent, the underlying skin (nail bed) may be more sensitive. It is important to use hypoallergenic adhesives and ensure proper hygiene to prevent skin irritation or infection. Regular check-ups with a dermatologist can help manage any skin issues related to the use of prosthetics.
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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