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20-September-2008 09:55:54 - hh antigen system Hh antigen system - diagram showing the molecular structure of the ABOH antigen system Hh antigen system - diagram showing the molecular structure of the ABOH antigen system hh is a rare blood group also called Bombay Blood group. Individuals with the rare Bombay phenotype hh do not express H antigen also called substance H the antigen which is present in blood group O. As a result, they cannot make A antigen also called substance A or B antigen also called substance B on their red blood cells, whatever alleles they may have of the A and B blood-group genes, because A antigen and B antigen are made from H antigen; receiving blood which contains an antigen which has never been in the patient's own blood causes an immune reaction. As a result, people who have Bombay phenotype can donate to any member of the ABO blood group system unless some other blood factor gene, such as Rhesus, is incompatible, but they cannot receive any member of the ABO blood group system's blood which always contains one or more of A and B and H antigens, but only from other people who have Bombay phenotype. The usual tests for ABO blood group system would show them as group O, unless the hospital worker involved has the means and the thought to test for Bombay group. This blood phenotype was first discovered in Bombay, now known as Mumbai, in India, by Dr. Y.M. Bhende. Contents 1 Transfusion compatibility 2 Genetics 3 In popular culture 4 External links Transfusion compatibility Individuals with Bombay phenotype blood group can only be transfused with blood from other Bombay phenotype individuals. Given that this condition is very rare, any person with this blood group who needs an urgent blood transfusion will probably be unable to get it, as no blood bank would have any in stock. Those anticipating the need for blood transfusion e.g. in scheduled surgery may bank blood for their own use i.e. an autologous blood donation, but this option is not available in cases of accidental injury. Genetics ABO - Bombay phenotype. It is easily explained by the H enzyme being coded for by a different gene to the A and B alleles. ABO - Bombay phenotype. It is easily explained by the H enzyme being coded for by a different gene to the A and B alleles. Patients who test as type O may have the Bombay phenotype if they have inherited two recessive alleles of the H gene, their blood group is Oh and their genotype is hh, and so do not produce the H carbohydrate fucose that is the precursor to the A and B antigens. It then no longer matters whether the A or B enzymes are present or not, as no A or B antigen can be produced since the precursor antigen H is not present. Despite the designation O, Oh negative is not a sub-group of any other group. When Bombay blood group was first encountered, it was found not to contain antigens A or B and so was thought to be of group O. But experience showed that Bombay group patients could not even safely receive normal O-group blood, and this proved to be because they lacked the H antigen. Because both parents must carry this recessive allele to transmit this blood type to their children, the condition mainly occurs in small closed-off communities where there is a good chance of both parents of a child either being of Bombay type, or being heterozygous for the h gene allele and so carrying the Bombay characteristic as recessive. Other examples may include noble families, which are inbred due to custom rather than local genetic variety.citation needed In popular culture Lists of miscellaneous information should be avoided. Please relocate any relevant information into appropriate sections or articles. November 2007 Television: Yakitate Japan Episode 49 of Monoco Cup Arc - Reunion at the VIP Seat! Heaven Again! - the clown Pierrot has Bombay blood. He gets wounded in the course of the show, and being rare enough that according to the show only several hundred people in the world would have it. It turns out his father is the king of Monaco, who also has Bombay blood. Television: Psi Factor The OSIR team encountered a young woman with the Bombay phenotype while working to solve the case of a haunting in the underground maintenance tunnels of a major city. The ghost would later be revealed as the spirit of her dead infant. Television: Get Backers Episode 35 - Get Back the Life! - a little girl who has Bombay blood gets in a car accident and badly needs blood transfusions; the blood transfusions meant for her from a neighboring hospital were stolen by a shady organization for research purposes. On General Hospital, Monica believed that her son, AJ Quartermaine, could not be her husband Alan's child and must have been the product of her affair with Rick, because AJ's blood type could not have arisen from hers and Alan's. It then turned out that Alan had the Bombay phenotype, and AJ really was his son.citation needed Anime: Kindaichi Case Files SP - Legendary Vampire Murders Kindaichi_Case_Files. Movies: The Telugu a south Indian language movie Okkadunnadu's main theme is based on the Bombay blood group. External links Hh at BGMUT Blood Group Antigen Gene Mutation Database at NCBI, NIH RMIT University The Bombay, para-Bombay and other H deficiencies v d e Transfusion medicine General concepts Apheresis Plasmapheresis, Plateletpheresis, Leukapheresis - Blood transfusion - Coombs test - Cross-matching - Exchange transfusion - International Society of Blood Transfusion - Intraoperative blood salvage - ISBT 128 - Transfusion reactions Human blood group systems - Blood type ABO - Chido-Rodgers - Colton - Cromer - Diego - Dombrock - Duffy - Gerbich - GIL - Hh - Ii - Indian - JMH - Kell Xk - Kidd - Knops - LW - Lewis - Lutheran - MNS - OK - P - Raph - Rh - Scianna - T-Tn - Xg - Yt - Other Blood products Blood donation - Blood substitutes - Cryoprecipitate - Platelets - Plasma - Red blood cells - Whole blood Retrieved from http://en..org/wiki/Hh_antigen_system Categories: Transfusion medicine | Blood antigen systemsHidden categories: All articles with statements | Articles with statements since February 2007 | Articles with trivia sections from November 2007 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Italiano Português Türkçe 中文 This page was last modified on 18 August 2008, at 17:53
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