Griscelli syndrome type 2 (also known as "partial albinism with immunodeficiency") is a rare autosomal recessive syndrome characterized by variable pigmentary dilution, hair with silvery metallic sheen, frequent pyogenic infections, neutropenia, and thrombocytopenia.
All types of Griscelli syndrome have distinctive skin and hair coloring.
Type 1 is associated with eurological abnormalities. These include delayed development, intellectual disability, seizures, hypotonia and eye abnormalities.
Type 2 - unlike type 1 - is not associated primary neurological disease but is associated with an uncontrolled T lymphocyte expansion and macrophage activation syndrome. It is often associated with the hemophagocytic syndrome. This latter condition may be fatal in the absence of bone marrow transplantation.
Persons with type 3 have the typical light skin and hair coloring but are otherwise normal.
There are three types of Griscelli syndrome.
Type 1 is associated with mutations in the MYO5A gene
Type 2 is associated with mutations in RAB27A gene.
Both these genes are located on the long arm of chromosome 15 (15q21).
Type 3 is associated with mutations in the MLPH gene.
All types are inherited in an autosomal recessive fashion.
Diagnosis | Differential diagnosis
This includes Chediak-Higashi syndrome and Elejalde syndrome (neuroectodermal melanolysosomal disease).
This syndrome was first described in 1978. In 2000 types 1 and 2 were distinguished.