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Reviewed May 2014
What is the official name of the HPS3 gene?
The official name of this gene is “Hermansky-Pudlak syndrome 3.”
HPS3 is the gene's official symbol. The HPS3 gene is also known by other names, listed below.
Read more about gene names and symbols on the About page.
What is the normal function of the HPS3 gene?
The HPS3 gene provides instructions for making a protein that forms part of a complex called biogenesis of lysosome-related organelles complex-2 (BLOC-2). This complex plays a role in the formation of a group of cellular structures called lysosome-related organelles (LROs). In particular, BLOC-2 controls the sorting and transport of proteins into LROs during their formation. LROs are very similar to compartments within the cell called lysosomes, which digest and recycle materials. However, LROs perform specialized functions and are found only in certain cell types.
Within pigment-producing cells (melanocytes), LROs called melanosomes produce and distribute melanin, which is the substance that gives skin, hair, and eyes their color. A different type of LRO is found in platelets, the blood cells involved in normal blood clotting. These LROs, called dense granules, release chemical signals that cause platelets to stick together and form a blood clot.
How are changes in the HPS3 gene related to health conditions?
Where is the HPS3 gene located?
Cytogenetic Location: 3q24
Molecular Location on chromosome 3: base pairs 149,129,584 to 149,173,518
(Homo sapiens Annotation Release 107, GRCh38.p2) (
The HPS3 gene is located on the long (q) arm of chromosome 3 at position 24.
More precisely, the HPS3 gene is located from base pair 149,129,584 to base pair 149,173,518 on chromosome 3.
See How do geneticists indicate the location of a gene? in the Handbook.
Where can I find additional information about HPS3?
You and your healthcare professional may find the following resources about HPS3 helpful.
You may also be interested in these resources, which are designed for genetics professionals and researchers.
What other names do people use for the HPS3 gene or gene products?
See How are genetic conditions and genes named? in the Handbook.
Where can I find general information about genes?
The Handbook provides basic information about genetics in clear language.
These links provide additional genetics resources that may be useful.
What glossary definitions help with understanding HPS3?
You may find definitions for these and many other terms in the Genetics Home Reference Glossary.
See also Understanding Medical Terminology.
References (11 links)
The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? in the Handbook.