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Anonychia congenita
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Anonychia congenita

Anonychia congenita is a rare genetic condition present from birth that is characterized by the partial or complete absence of fingernails and toenails.

Overview

Anonychia congenita is a condition that affects the fingernails and toenails. Individuals with this condition are typically missing all of their fingernails and toenails (anonychia). This absence of nails is noticeable from birth (congenital). In some cases, only part of the nail is missing (hyponychia) or not all fingers and toes are affected. All of the other tissues at the tips of the fingers and toes, including structures that usually support the nail and its growth (such as the nail bed), are normal. Individuals with anonychia congenita do not have any other health problems related to the condition.

Frequency

Anonychia congenita is a rare condition; its prevalence is unknown.

Causes

Mutations in the RSPO4 gene cause anonychia congenita. The RSPO4 gene provides instructions for making a protein called R-spondin-4, which 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, adhesion, migration, and other cellular activities. During early development, Wnt signaling plays a critical role in the growth and development of nails.

  • RSPO4 gene mutations lead to the production of a protein with little or no function.
  • As a result, R-spondin-4 cannot participate in the Wnt signaling pathway, and nails develop improperly or not at all.
  • Anonychia congenita can also be part of syndromes that affect multiple parts of the body, including Coffin-Siris syndrome and nail-patella syndrome.

Inheritance

Anonychia congenita resulting from RSPO4 gene mutations is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Other Names

  • Absent nails
  • Anonychia
  • Aplastic nails
  • Congenital absence of nails
  • Hyponychia congenita

Frequently Asked Questions

While the nail bed and underlying tissues are structurally normal, the lack of a hard nail plate means the fingertips and toes are more vulnerable to minor trauma, abrasions, and moisture retention. Parents should practice diligent hand and foot hygiene, keeping the areas clean and dry to prevent fungal or bacterial infections. It is also advisable to use protective gloves during activities that involve rough surfaces or chemicals, and to monitor the skin closely for any signs of redness, swelling, or irritation that might indicate an underlying issue. Is it possible to grow artificial nails or use prosthetics to cover the missing nail beds?::Yes, many individuals with anonychia congenita choose to use cosmetic prosthetics or artificial nails for aesthetic reasons or to provide a slight layer of protection. Since the nail bed is healthy, adhesion methods used for standard artificial nails can often be applied, though sensitivity to adhesives should be tested first. Some patients also use silicone tips or custom-made prosthetics. These options are purely cosmetic and do not restore the natural function of a nail, but they can help with confidence and minor physical protection. Does anonychia congenita impact the strength or dexterity of the hands and feet?::No, anonychia congenita does not affect the strength, dexterity, or overall function of the hands and feet. The condition is isolated to the nail plate; the bones, muscles, tendons, and nerves in the fingers and toes develop and function normally. Individuals can perform all standard tasks, including typing, gripping, and walking, without any physical limitation related to the absence of nails. What is the likelihood that my children will inherit anonychia congenita if I have it?::Anonychia congenita caused by RSPO4 gene mutations follows an autosomal recessive inheritance pattern. This means that if you have the condition, you have two copies of the mutated gene. Your children will inherit one copy from you, making them carriers, but they will not have the condition unless their other parent is also a carrier of a mutation in the same gene. If your partner is not a carrier, your children will not have anonychia congenita, though they will carry the gene. Genetic counseling can provide specific risk assessments based on family history.
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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