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

LYST gene

The LYST gene provides instructions for a protein that regulates lysosomal trafficking, which is vital for maintaining cellular recycling and immune function.

Normal Function

The LYST gene (also known as CHS1) provides instructions for making a protein known as the lysosomal trafficking regulator. Researchers believe that this protein plays a role in the transport (trafficking) of materials into structures called lysosomes. Lysosomes act as recycling centers within cells. They use digestive enzymes to break down toxic substances, digest bacteria that invade the cell, and recycle worn-out cell components. Although the lysosomal trafficking regulator protein is involved in the normal function of lysosomes, its exact role is unknown. Studies suggest that this protein may help determine the size of lysosomes and regulate their movement within cells.

Health Conditions Related to Genetic Changes

Chediak-Higashi syndrome

At least 30 mutations in the LYST gene have been identified in people with Chediak-Higashi syndrome. These mutations impair the normal function of the lysosomal trafficking regulator protein, which disrupts the size, structure, and function of lysosomes and related structures within cells.

  • LYST mutations that cause the severe, childhood form of Chediak-Higashi syndrome typically result in the production of an abnormally short, nonfunctional version of the protein.
  • Mutations responsible for the milder, adult version of this disease usually change a single protein building block (amino acid), allowing the altered protein to retain some function.

People with LYST mutations have abnormally large lysosomes and related structures in cells throughout the body, which interfere with normal cell functions:

  • Immune System: Enlarged lysosomes in certain immune cells prevent them from responding appropriately to bacteria, leading to severe, recurrent infections.
  • Pigmentation: In pigment cells called melanocytes, structures called melanosomes are abnormally large. Because melanin is trapped within these giant structures, it cannot contribute to skin, hair, and eye pigmentation, resulting in oculocutaneous albinism.
  • Platelets and Nerves: Abnormal lysosome-like structures in platelets underlie abnormal bruising and bleeding, while abnormal lysosomes in nerve cells likely cause associated neurological problems.

Other Names for This Gene

  • Beige homolog
  • Chediak-Higashi syndrome 1
  • CHS
  • CHS1
  • LYST_HUMAN

Genomic Location

The LYST gene is found on chromosome 1.

Frequently Asked Questions

Diagnosis is confirmed by genetic testing that identifies pathogenic variants in the LYST gene. Prior to genetic results, clinicians may use a peripheral blood smear to look for giant lysosomal granules in neutrophils, and flow cytometry can assess abnormal lysosomal trafficking.
Because Chediak‑Higashi syndrome is autosomal recessive, siblings of an affected child have a 25 % chance of being affected and a 50 % chance of being carriers. Carrier testing using targeted LYST mutation analysis is recommended for parents and at‑risk relatives. Couples who are both carriers can consider pre‑implantation genetic diagnosis (PGD) or prenatal testing to inform reproductive decisions.
Early clues often include unusually light skin, hair, or eye color (partial albinism), frequent bacterial infections that are hard to treat, and easy bruising or bleeding due to platelet dysfunction. Some children also develop a characteristic “silvery‑gray” hair sheen and may have a history of prolonged fever after minor infections.
Management focuses on aggressive infection control: prophylactic antibiotics, prompt treatment of bacterial infections, and regular immunizations (excluding live vaccines during severe immunodeficiency). In the “accelerated phase,” hematopoietic stem cell transplantation (HSCT) can restore immune function and improve survival. Supportive care includes platelet transfusions for bleeding and vitamin D supplementation for bone health.
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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