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SNAI2 gene
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Gene

SNAI2 gene

The SNAI2 gene provides instructions for creating a protein essential for embryonic development and the maintenance of adult cell functions.

Normal Function

The SNAI2 gene (often called SLUG) provides the instructions for making a protein called snail 2. Snail 2 belongs to the snail protein family, which plays a role in the formation of tissues during embryonic development. The snail 2 protein is also found in most adult tissues, where it likely helps maintain normal cell function after birth. By attaching to critical regions of DNA to control the activity of particular genes, the protein acts as a transcription factor.

Research indicates that the snail 2 protein is required during embryonic growth for the development of neural crest cells. These cells migrate from the developing spinal cord to specific regions in the embryo, giving rise to many tissues and cell types, including nerve tissue and pigment-producing cells called melanocytes. Melanocytes produce the pigment melanin, which contributes to hair, eye, and skin color, and are also found in certain regions of the brain and inner ear. The snail 2 protein likely plays a role in the formation and survival of these cells.

Health Conditions Related to Genetic Changes

Piebaldism

In some cases of piebaldism, a condition characterized by white patches of skin and hair caused by a lack of melanocytes, one copy of the SNAI2 gene is missing (deleted). This loss likely reduces the production of the snail 2 protein, which may disrupt the development of melanocytes in certain areas of the skin and hair, causing the patchy loss of pigment.

Waardenburg syndrome

In some cases of Waardenburg syndrome type II, both copies of the SNAI2 gene are missing. The resulting absence of the snail 2 protein may disrupt the development of melanocytes in the skin, hair, eyes, and inner ear, leading to the hearing loss and patchy loss of pigmentation characteristic of this syndrome.

Other Names for This Gene

  • neural crest transcription factor SLUG
  • SLUG
  • slug homolog, zinc finger protein (chicken)
  • SLUG_HUMAN
  • SLUGH1
  • snail 2
  • snail family zinc finger 2
  • snail homolog 2 (Drosophila)
  • SNAIL2
  • WS2D

Frequently Asked Questions

Piebaldism is often caused by a deletion or loss‑of‑function mutation in the SNAI2 (SLUG) gene. SNAI2 is a transcription factor that directs the migration and survival of melanocyte precursors during embryonic development. When SNAI2 is absent or reduced, melanocytes fail to populate certain skin and hair regions, leading to permanent white patches. The pattern is typically stable and does not spread over time.
Waardenburg syndrome type II is diagnosed through a combination of clinical features—such as sensorineural hearing loss, pigmentary abnormalities, and sometimes dystopia canthorum—and genetic testing. Mutations in SNAI2 are one of several genes that can cause this subtype; they disrupt melanocyte development, leading to the characteristic pigment changes. A confirmed SNAI2 mutation helps differentiate type II from other Waardenburg subtypes and informs prognosis.
Yes. Since piebaldism and many forms of Waardenburg syndrome are inherited in an autosomal dominant pattern, each child of an affected individual has a 50 % chance of inheriting the mutation. Genetic counseling can explain this risk, discuss prenatal testing (amniocentesis or chorionic villus sampling) and pre‑implantation genetic diagnosis (PGD) for embryos that do not carry the mutation. Couples may also explore assisted reproductive technologies or adoption if they wish to avoid transmission.
Currently, there is no cure that regenerates melanocytes in affected skin or hair. Cosmetic approaches—such as targeted tattooing, laser pigmenting, or topical depigmentation agents—can improve appearance. Research into stem‑cell therapies or gene editing is ongoing but not yet clinically available. Early intervention with dermatologic care can help manage skin sensitivity and prevent secondary complications.
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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