Is Chediak Higashi Syndrome hereditary?

Chediak Higashi Syndrome is a rare hereditary condition caused by mutations in the LYST gene, which affects the function of lysosomes within cells. Because it follows an autosomal recessive inheritance pattern, a child must inherit two mutated copies of the gene—one from each parent—to develop the disorder.

Is Chediak Higashi Syndrome inherited or spontaneous?

Chediak Higashi Syndrome is strictly a hereditary condition. It is not caused by environmental factors, and de novo (spontaneous) mutations are extremely rare. Because it is autosomal recessive, parents of an affected child are typically asymptomatic carriers, each possessing one functional gene and one mutated gene. Chediak Higashi Syndrome manifests only when a child receives the recessive mutation from both parents.

What is the risk to future children?

When both parents are identified as carriers of a LYST gene mutation, the risk for each pregnancy is as follows:

• 25% chance the child will have Chediak Higashi Syndrome.


• 50% chance the child will be an asymptomatic carrier like the parents.


• 25% chance the child will inherit two functional copies of the gene, neither affected nor a carrier.

How is genetic testing utilized for this condition?

Genetic testing is the definitive method for confirming a diagnosis of Chediak Higashi Syndrome. By performing molecular analysis of the LYST gene, clinicians can identify pathogenic variants. Testing is recommended for individuals presenting with classic symptoms such as partial albinism, recurrent infections, and neurological abnormalities. For families with a known history, carrier testing and prenatal diagnosis (via amniocentesis or chorionic villus sampling) are available to provide reproductive options.

The role of genetic counseling

Genetic counseling is vital for families affected by Chediak Higashi Syndrome. A genetic counselor helps families understand the inheritance risks, interprets complex test results, and discusses reproductive technologies like Preimplantation Genetic Testing (PGT) for those planning future pregnancies. At DiseaseMaps.org, we have seen 3 members join our community to share their experiences with this rare condition, highlighting the importance of peer support alongside clinical guidance.

Next steps

• Consult with a board-certified clinical geneticist to discuss molecular testing for Chediak Higashi Syndrome.


• Request a referral to a genetic counselor to map out family inheritance risks.


• Connect with the DiseaseMaps.org community to share experiences with others navigating this diagnosis.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or qualified health provider.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Chediak-Higashi syndrome.


• Orphanet: Chediak-Higashi syndrome (ORPHA:167).


• OMIM (Online Mendelian Inheritance in Man): Chediak-Higashi syndrome; CHS1 (Entry #214500).