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FRMD7 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

FRMD7 gene

The FRMD7 gene provides instructions for producing a protein that is highly expressed in the brain and retina, where it is believed to play a critical role in the development of nerve cells.

Normal Function

The FRMD7 gene provides instructions for making a protein whose exact function is unknown. This protein is found in many tissues, but it is most abundant in areas of the brain that control eye movement (such as the midbrain and cerebellum) and in the light-sensitive tissue at the back of the eye (retina). The FRMD7 protein likely plays a role in the development of nerve cells in these areas of the brain and the retina.

Health Conditions Related to Genetic Changes

X-linked infantile nystagmus

More than 35 mutations in the FRMD7 gene have been found to cause X-linked infantile nystagmus. Most of these mutations change single protein building blocks (amino acids) in the FRMD7 protein. Mutations in the FRMD7 gene likely lead to the production of a protein that is unstable and that cannot perform its normal function.

A lack of functional FRMD7 protein is thought to disrupt the development of nerve cells in the retina and areas of the brain that control eye movement. Abnormal development of these nerve cells likely causes the involuntary side-to-side eye movements that are characteristic of X-linked infantile nystagmus.

Other Names for This Gene

  • FRMD7_HUMAN
  • NYS1

Genomic Location

The FRMD7 gene is found on the X chromosome.

Frequently Asked Questions

There is no cure for the underlying gene defect, but several supportive measures can help. Low‑vision aids (magnifiers, high‑contrast materials) improve reading. Optical correction (glasses or contact lenses) optimizes refractive error. Some patients benefit from prism lenses that dampen the oscillation. In selected cases, botulinum toxin injections or surgical realignment of extra‑ocular muscles can modestly reduce amplitude. Vision therapy and biofeedback training may also improve fixation stability, though evidence is limited.
pediatric ophthalmologist will first document the characteristic involuntary eye movements, assess visual acuity, and rule out other ocular or neurologic causes. If the nystagmus appears before 6 months of age, is isolated (no other eye disease), and there is a family history of similar eye movement disorders, clinicians often order FRMD7 sequencing or a targeted X‑linked panel. Genetic confirmation helps with counseling, prognosis, and eligibility for research studies.
FRMD7 is located on the X chromosome. A carrier mother has a 50 % chance of passing the mutated X to each child. Sons who inherit the mutated X will be affected because they have only one X chromosome. Daughters who inherit the mutated X become carriers like their mother; they usually have normal eye movements but can pass the mutation to the next generation. Prenatal testing (chorionic villus sampling or amniocentesis) or pre‑implantation genetic diagnosis can be considered if you want definitive information before birth.
The classic presentation is in infancy, but very mild cases may go unnoticed until later childhood or adulthood when visual demands increase. Adults who discover nystagmus later often have subtle eye‑movement oscillations that were previously compensated. Associated issues can include reduced visual acuity, astigmatism, strabismus, or amblyopia from early misalignment. Regular eye exams are important to monitor for refractive changes, cataract formation, or retinal abnormalities, although FRMD7 mutations themselves do not directly cause retinal disease.
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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