Chédiak–Higashi syndrome: Difference between revisions
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'''Chédiak–Higashi syndrome'''<ref name="Bolognia">{{cite book |author=Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set |publisher=Mosby |location=St. Louis |year=2007 |pages= |isbn=1-4160-2999-0 |oclc= |doi= |accessdate=}}</ref> is a rare [[autosomal recessive]] disorder that arises from a mutation of a lysosomal trafficking regulator protein,<ref> |
'''Chédiak–Higashi syndrome'''<ref name="Bolognia">{{cite book |author=Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. |title=Dermatology: 2-Volume Set |publisher=Mosby |location=St. Louis |year=2007 |pages= |isbn=1-4160-2999-0 |oclc= |doi= |accessdate=}}</ref> is a rare [[autosomal recessive]] disorder that arises from a mutation of a lysosomal trafficking regulator protein,<ref>{{cite journal |author=Kaplan J, De Domenico I, Ward DM |title=Chediak-Higashi syndrome |journal=Curr. Opin. Hematol. |volume=15 |issue=1 |pages=22–9 |date=January 2008 |pmid=18043242 |doi=10.1097/MOH.0b013e3282f2bcce |url=http://meta.wkhealth.com/pt/pt-core/template-journal/lwwgateway/media/landingpage.htm?issn=1065-6251&volume=15&issue=1&spage=22}}<!-- Bot generated title -->]</ref> which leads to a decrease in [[phagocytosis]]. The decrease in phagocytosis results in recurrent [[pyogenic]] infections, partial [[albinism]] and peripheral [[neuropathy]]. It occurs in humans, [[cattle]], [[white tiger]]s, blue [[Persian cat]]s, [[fancy rat|Australian blue rats]],<ref>[http://www.ratbehavior.org/AustralianBlue.htm Australian blue rats: a hypothesis<!-- Bot generated title -->]</ref> [[mice]],<ref name=autogenerated1>[http://www.ratbehavior.org/AustralianBlue.htm#Appendix Australian blue rats: a hypothesis<!-- Bot generated title -->]</ref> [[mink]],<ref name=autogenerated1 /> foxes,<ref name=autogenerated1 /> and the only known captive [[Chimo (killer whale)|albino orca]].<ref>[http://web.archive.org/web/20080405094313/http://www.geocities.com/theorcaocean/Captives-Chimo.html The Orca Ocean<!-- Bot generated title -->]</ref> |
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==Signs and symptoms== |
==Signs and symptoms== |
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title=Chediak Higashi syndrome | accessdate=2008-11-06 }}</ref> |
title=Chediak Higashi syndrome | accessdate=2008-11-06 }}</ref> |
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Under light microscopy the hairs present evenly distributed, regular melanin granules, larger than those found in normal hairs. Under polarized light microscopy these hairs exhibit a bright and polychromatic refringence pattern.<ref name=Falus2006>Falus A, |
Under light microscopy the hairs present evenly distributed, regular melanin granules, larger than those found in normal hairs. Under polarized light microscopy these hairs exhibit a bright and polychromatic refringence pattern.<ref name=Falus2006>{{cite journal |author=Falus A, Fenyo M, Eder K, Madarasi A |title=[Polarized light as an epigenetic factor in inhibition of inflammation; a genome-wide expression analysis in recurrent respiratory diseases of children] |language=Hungarian |journal=Orv Hetil |volume=152 |issue=37 |pages=1492–9 |date=September 2011 |pmid=21893480 |doi=10.1556/OH.2011.29162 |url=http://www.akademiai.com/openurl.asp?genre=article&id=doi:10.1556/OH.2011.29162}}</ref> |
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===Clinical findings=== |
===Clinical findings=== |
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==References== |
==References== |
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==External links== |
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*[http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=gene&part=chediak-higashi GeneReviews/NCBI/NIH/UW entry on Chediak-Higashi Syndrome] |
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{{Myeloid and complement immunodeficiency}} |
{{Myeloid and complement immunodeficiency}} |
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Revision as of 14:06, 26 April 2014
| Chédiak–Higashi syndrome | |
|---|---|
| Specialty | Endocrinology  |
Chédiak–Higashi syndrome[1] is a rare autosomal recessive disorder that arises from a mutation of a lysosomal trafficking regulator protein,[2] which leads to a decrease in phagocytosis. The decrease in phagocytosis results in recurrent pyogenic infections, partial albinism and peripheral neuropathy. It occurs in humans, cattle, white tigers, blue Persian cats, Australian blue rats,[3] mice,[4] mink,[4] foxes,[4] and the only known captive albino orca.[5]
Signs and symptoms
People with CHS have light skin and silvery hair (partial albinism) and frequently complain of solar sensitivity and photophobia. Other signs and symptoms vary considerably, but frequent infections and neuropathy are common. The infections involve mucous membranes, skin, and the respiratory tract. Affected children are susceptible to infection by Gram-positive and gram-negative bacteria and fungi, with Staphylococcus aureus being the most common infection cause. Neuropathy often begins in the teenage years and becomes the most prominent problem. Infections in CHS patients tend to be very serious and even life-threatening; few patients with this condition live to adulthood.
Most children with Chédiak–Higashi syndrome ultimately reach a stage known as the accelerated phase, also known as the lymphoma-like-syndrome. This severe phase of the disease is thought to be triggered by a viral infection, usually the Epstein-Barr virus (EBV).[citation needed] In the accelerated phase, defective white blood cells divide uncontrollably and invade many of the body's organs. The accelerated phase is associated with fever, episodes of abnormal bleeding, overwhelming infections, and organ failure. These medical problems are usually life-threatening in childhood.
Causes
Mutations in the CHS1 gene (also called LYST) have been found to be connected with Chédiak–Higashi Syndrome. This gene 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 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.[6]
Pathophysiology
CHS is a disease causing impaired bacteriolysis[7] due to failure of phagolysosome formation. As a result of disordered intracellular trafficking there is impaired lysosome degranulation with phagosomes, so phagocytosed bacteria are not destroyed by the lysosome's enzymes.
In addition, secretion of lytic secretory granules by cytotoxic T cells is affected.
The disease is characterised by large lysosome vesicles in phagocytes (neutrophils), which thus have poor bactericidal function, leading to susceptibility to infections, abnormalities in nuclear structure of leukocytes, anemia, and hepatomegaly. Dohle bodies in the neutrophil are also seen in this syndrome which are ruptured rough endoplasmic reticulum.
Diagnosis
The diagnosis is confirmed by bone marrow smears that show "giant inclusion bodies" in the cells that develop into white blood cells (leukocyte precursor cells). CHS can be diagnosed prenatally by examining a sample of hair from a fetal scalp biopsy or testing leukocytes from a fetal blood sample.[8]
Under light microscopy the hairs present evenly distributed, regular melanin granules, larger than those found in normal hairs. Under polarized light microscopy these hairs exhibit a bright and polychromatic refringence pattern.[9]
Clinical findings
There are several manifestations of Chédiak–Higashi syndrome as mentioned above; however, neutropenia seems to be the most common. The syndrome is associated with oculocutaneous albinism. Persons are prone for infections, especially with Staphylococcus aureus, as well as Streptococci.
It is associated with periodontal disease of the deciduous dentition. Associated features include abnormalities in melanocytes (albinism), nerve defects, bleeding disorders.
Treatment
There is no specific treatment for Chédiak–Higashi syndrome. Bone marrow transplants appear to have been successful in several patients. Infections are treated with antibiotics and abscesses are surgically drained when appropriate. Antiviral drugs such as acyclovir have been tried during the terminal phase of the disease. Cyclophosphamide and prednisone have been tried. Vitamin C therapy has improved immune function and clotting in some patients.[10]
Eponym
It is named for the Cuban physician and serologist Alejandro Moisés Chédiak (1903–1993) and the Japanese pediatrician Otokata Higashi (1883–1981).[11] It is often spelled without the accent as Chediak–Higashi syndrome.
See also
- Griscelli syndrome (also known as "Chédiak–Higashi like syndrome")
References
- ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. ISBN 1-4160-2999-0.
{{cite book}}: CS1 maint: multiple names: authors list (link) - ^ Kaplan J, De Domenico I, Ward DM (January 2008). "Chediak-Higashi syndrome". Curr. Opin. Hematol. 15 (1): 22–9. doi:10.1097/MOH.0b013e3282f2bcce. PMID 18043242.
{{cite journal}}: CS1 maint: multiple names: authors list (link)] - ^ Australian blue rats: a hypothesis
- ^ a b c Australian blue rats: a hypothesis
- ^ The Orca Ocean
- ^ "Chediak–Higashi syndrome". Retrieved 2008-11-06.
- ^ "Chédiak–Higashi syndrome". Merck Manuals. Retrieved 2008-03-01.
- ^ "Chediak Higashi syndrome". Retrieved 2008-11-06.
- ^ Falus A, Fenyo M, Eder K, Madarasi A (September 2011). "[Polarized light as an epigenetic factor in inhibition of inflammation; a genome-wide expression analysis in recurrent respiratory diseases of children]". Orv Hetil (in Hungarian). 152 (37): 1492–9. doi:10.1556/OH.2011.29162. PMID 21893480.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Hughes, DA (February 1999). "Effects of dietary antioxidants on the immune function of middle-aged adults". The Proceedings of the Nutrition Society. 58 (1): 79–84. PMID 10343344.
- ^ Saez-De-Ocariz M, Orozco-Covarrubias L, Duràn-McKinster C, Ruiz-Maldonado R (2008). "Silver hair syndromes: Chediak–Higashi syndrome (CHS) and Griscelli syndromes (GS)". In Ruggieri M, Pascual-Castroviejo I, Di Rocco C, editors (ed.). Neurocutaneous Disorders: Phakomatoses and Hamartoneoplastic Syndromes. Springer. pp. 407–26. doi:10.1007/978-3-211-69500-5_19. ISBN 978-3-211-21396-4.
{{cite book}}:|editor=has generic name (help)CS1 maint: multiple names: authors list (link)