Last updated:
March 12, 2018
Years published: 1993, 1998, 1999, 2005, 2008, 2012, 2015, 2018
NORD gratefully acknowledges William A. Gahl, MD, PhD, Clinical Director, National Human Genome Research Institute; Head, Section on Human Biochemical Genetics, Medical Genetics Branch; Director, Undiagnosed Diseases Program, National Institutes of Health, for assistance in the preparation of this report.
Hermansky-Pudlak syndrome (HPS) is a rare, hereditary disorder that consists of two characteristics: decreased pigmentation (albinism) with visual impairment, and blood platelet dysfunction with prolonged bleeding. Some patients have lung fibrosis, colitis, or an abnormal storage of a fatty-like substance (ceroid lipofuscin) in various tissues of the body.
The first symptoms of HPS often include easy bruising, bleeding gums, nose bleeds, and excessive bleeding after surgery or accidents. The classic symptoms of Hermansky-Pudlak syndrome include the lack of color (pigmentation) in the skin, hair, and eyes (oculocutaneous albinism), and dysfunction of blood platelets leading to prolonged bleeding (storage pool-deficient platelets).
The skin, hair, and eyes of a person with HPS may vary in color from very pale to almost normal coloring. Eyesight is almost always impaired, commonly with visual acuities of 20/200 or worse (i.e., legally blind). The blood storage abnormality may cause excessive bleeding, especially in women during menstruation. Bleeding may become life-threatening, and aspirin makes the bleeding worse. Approximately one-sixth of HPS patients develop inflammation of the colon, with bleeding. Patients with type 1, type 2, or type 4 HPS (see below) develop a lung disease called pulmonary fibrosis that can lead to death in their thirties, forties, or fifties.
The deposits of fatty-like ceroid lipofuscin may occur within the cells of many organs such as the lungs, colon, heart, and kidneys. This by itself is not known to cause symptoms.
HPS is inherited as an autosomal recessive genetic disease. Mutations in one of 10 genes (HPS1, AP3B1, HPS3, HPS4, HPS5, HPS6, DTNBP1, BLOC1S3, PLDN, and AP3D1) are responsible for this disorder. Research suggests that an abnormality of the formation or movement of lysosome-like vesicles may be responsible for the development of the disease. Humans inherit one gene from the father and one from the mother. In recessive disorders, the condition does not appear unless a person inherits one defective gene from each parent. If an individual receives one normal gene and one gene for the disease, the person will be a carrier for the disease, but will not show symptoms. If both parents are carriers for a recessive disorder, the risk of transmitting the disease to a child is 25 percent; the risk that a child would be a carrier for the disease is 50 percent, and a child would inherit two normal genes 25 percent of the time. The risk is the same for each pregnancy.
HPS is a rare disorder that affects males and females in equal numbers. It is most prevalent in persons from northwest Puerto Rico, where HPS affects one of every 1,800 individuals. One in 21 individuals of northwest Puerto Rican descent is believed to be carriers of the HPS type 1 gene. However, HPS does occur in other populations as well. It is the third most prevalent form of albinism.
HPS is diagnosed by the clinical features of hypopigmentation of the skin and hair, characteristic eye findings, and characteristic appearance of the blood platelets under an electron microscope. Molecular genetic testing for mutations in the HPS1, AP3B1, HPS3, HPS4, HPS5, HPS6, DTNBP1, BLOC1S3, PLDN, and AP3D1 genes is available to confirm the diagnosis.
Treatment of HPS patients with excessive bleeding may consist of transfusions of normal blood platelets. Women with excessive menstrual bleeding (menorrhagia) can be treated with oral contraceptives. The drug desmopressin acetate (DDAVP) can also be administered to patients with acute bleeding and has proved effective for some patients with this symptom. Individuals with HPS should avoid blood anticoagulants, such as aspirin.
Patients with HPS types 1, 2, or 4 who develop pulmonary fibrosis may eventually need a lung transplant. For these individuals, platelet transfusions should be used sparingly, since multiple such transfusions can induce antibodies that could cause graft rejection.
Genetic counseling is recommended for affected individuals and their families. Other treatment is symptomatic and supportive.
Information on current clinical trials is posted on the Internet at www.clinicaltrials.gov. All studies receiving U.S. government funding, and some supported by private industry, are posted on this government website.
For information about clinical trials being conducted at the National Institutes of Health (NIH) in Bethesda, MD, contact the NIH Patient Recruitment Office:
Tollfree: (800) 411-1222
TTY: (866) 411-1010
Email: [email protected]
Some current clinical trials also are posted on the following page on the NORD website:
https://rarediseases.org/living-with-a-rare-disease/find-clinical-trials/
For information about clinical trials sponsored by private sources, contact:
www.centerwatch.com
For information about clinical trials conducted in Europe, contact:
https://www.clinicaltrialsregister.eu/
A study is being conducted at the National Institutes of Health/National Human Genome Research Institute to gather information on Hermansky-Pudlak syndrome. More studies are needed to determine the safety and effectiveness of treatments for Hermansky-Pudlak syndrome.
Hermansky Pudlak syndrome Resources
TEXTBOOKS
Hematology, 4th Ed,: William J. Williams, et al., Editors; McGraw-Hill, Inc., 2013. Pp. 1177.
The Metabolic Basis of Inherited Disease, 6th Ed.: Charles R. Scriver, et al., Editors; McGraw Hill, 1989. Pp. 2905, 2916, 2929-2930.
JOURNAL ARTICLES
Gahl WA, Brantly M, Kaiser-Kupfer MI, Iwata F, Hazelwood S, Shotelersuk V, Duffy LF, Kuehl EM, Bernardini I. Genetic defects and clinical characteristics of patients with a form of oculocutaneous albinism (Hermansky-Pudlak syndrome). N Engl J Med. 1998;338:1258-64.
INTERNET
Huizing M, Malicdan MCV, Gochuico BR, et al. Hermansky-Pudlak Syndrome. 2000 Jul 24 [Updated 2017 Oct 26]. In: Adam MP, Ardinger HH, Pagon RA, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2017. Available from: https://www.ncbi.nlm.nih.gov/books/NBK1287/ Accessed March 8, 2018.
NORD strives to open new assistance programs as funding allows. If we don’t have a program for you now, please continue to check back with us.
NORD and MedicAlert Foundation have teamed up on a new program to provide protection to rare disease patients in emergency situations.
Learn more http://rarediseases.org/patient-assistance-programs/medicalert-assistance-program/Ensuring that patients and caregivers are armed with the tools they need to live their best lives while managing their rare condition is a vital part of NORD’s mission.
Learn more http://rarediseases.org/patient-assistance-programs/rare-disease-educational-support/This first-of-its-kind assistance program is designed for caregivers of a child or adult diagnosed with a rare disorder.
Learn more http://rarediseases.org/patient-assistance-programs/caregiver-respite/Powered by NORD, the IAMRARE Registry Platform® is driving transformative change in the study of rare disease. With input from doctors, researchers, and the US Food & Drug Administration, NORD has created IAMRARE to facilitate patient-powered natural history studies to shape rare disease research and treatments. The ultimate goal of IAMRARE is to unite patients and research communities in the improvement of care and drug development.