Rh blood group system - wikipedia Rh blood group system `` Rh - '' redirects here. For the Siddharta album, see Rh - ( album ). For the band, see The RH Factor. The Rh blood group system is one of thirty - five known human blood group systems. It is the second most important blood group system, after the ABO blood group system. The Rh blood group system consists of 49 defined blood group antigens, among which the five antigens D, C, c, E, and e are the most important. There is no d ( `` little d '' ) antigen. Rh ( D ) status of an individual is normally described with a positive or negative suffix after the ABO type. e.g. Someone who is A Positive has the A antigen and the Rh ( D ) antigen, whereas someone who is A Negative lacks the Rh ( D ) antigen. The terms Rh factor, Rh positive and Rh negative refer to the Rh ( D ) antigen only. Antibodies to Rh antigens can be involved in hemolytic transfusion reactions and antibodies to the Rh ( D ) and Rh ( c ) antigens confer significant risk of Hemolytic disease of the fetus and newborn. The term `` Rh '' was originally an abbreviation of `` Rhesus factor. '' It was discovered in 1937 by Karl Landsteiner and Alexander S. Wiener who, at the time, believed it to be a similar antigen found in rhesus monkey red blood cells. It was subsequently learned the human factor is not identical to the rhesus monkey factor ; but by then, `` Rhesus Group '' and like terms were already in widespread, worldwide use. Thus, notwithstanding it is a misnomer, the term survives ( e.g. rhesus blood group system, and the obsolete terms rhesus factor, rhesus positive, and rhesus negative - all three which actually refer specifically and only to the Rh D factor ; and, thus, are misleading when unmodified ). Contemporary practice is to use `` Rh '' as a term of art instead of `` Rhesus '' ; viz. `` Rh Group, '' `` Rh factors, '' `` Rh D, '' etc. Contents 1 History of discoveries 2 Rh nomenclature 3 Rh system antigens 4 Hemolytic disease of the newborn 5 Population data 6 Inheritance 7 Function 8 Origin of RHD polymorphism 9 Weak D 10 Partial D 11 Rh phenotype 12 Other Rh group antigens 13 Rh antibodies 14 References 15 External links History of discoveries The first rhesus blood type was discovered in 1937 by Landsteiner and Wiener, who named it after a similar factor found in rhesus monkey blood. The significance of the discovery was not immediately apparent and was only realized in 1940, after subsequent findings by Philip Levine and Rufus Stetson. The serum that led to the discovery was produced by immunizing rabbits with red blood cells from a rhesus macaque. The antigen that induced this immunization was designated by them as Rh factor to indicate that rhesus blood had been used for the production of the serum. In 1939, Phillip Levine and Rufus Stetson published in a first case report the clinical consequences of non-recognized Rh factor, hemolytic transfusion reaction, and hemolytic disease of the newborn in its most severe form. It was recognized that the serum of the reported woman agglutinated with red blood cells of about 80 % of the people although the then known blood groups, in particular ABO were matched. No name was given to this agglutinin when described. In 1940, Karl Landsteiner and Alexander S. Wiener made the connection to their earlier discovery, reporting a serum that also reacted with about 85 % of different human red blood cells. In 1941, Group O : a patient of Dr. Paul in Irvington, NJ, delivered a normal infant in 1931 : this pregnancy was followed by a long period of sterility. The second pregnancy ( April, 1941 ) resulted in an infant suffering icterus gravis. In May 1941, the third anti-Rh serum ( M.S. ) of Group O became available. Based on the serologic similarities, Rh factor was later also used for antigens, and anti-Rh for antibodies, found in humans such as those previously described by Levine and Stetson. Although differences between these two sera were shown already in 1942 and clearly demonstrated in 1963, the already widely used term `` Rh '' was kept for the clinically described human antibodies which are different from the ones related to the rhesus monkey. This real factor found in rhesus macaque was classified in the Landsteiner - Wiener antigen system ( antigen LW, antibody anti-LW ) in honor of the discoverers. It was recognized that the Rh factor was just one in a system of various antigens. Based on different models of genetic inheritance, two different terminologies were developed ; both of them are still in use. The clinical significance of this highly immunizing D antigen ( i.e., Rh factor ) was soon realized. Some keystones were to recognize its importance for blood transfusion ( including reliable diagnostic tests ), hemolytic disease of the newborn ( including exchange transfusion ), and very importantly the prevention of it by screening and prophylaxis. The discovery of fetal cell - free DNA in maternal circulation by Holzgrieve et al. led to the noninvasive genotyping of fetal Rh genes in many countries. Rh nomenclature Rh haplotype notation Fisher - Race Wiener Dce DCe DcE DCE dce r dCe r ′ dcE r '' dCE r The Rh blood group system has two sets of nomenclatures : one developed by Ronald Fisher and R.R. Race, the other by Wiener. Both systems reflected alternative theories of inheritance. The Fisher - Race system, which is more commonly in use today, uses the CDE nomenclature. This system was based on the theory that a separate gene controls the product of each corresponding antigen ( e.g., a `` D gene '' produces D antigen, and so on ). However, the d gene was hypothetical, not actual. The Wiener system used the Rh -- Hr nomenclature. This system was based on the theory that there was one gene at a single locus on each chromosome, each contributing to production of multiple antigens. In this theory, a gene R is supposed to give rise to the `` blood factors '' Rh, rh ′, and rh '' ( corresponding to modern nomenclature of the D, C, and E antigens ) and the gene r to produce hr ′ and hr '' ( corresponding to modern nomenclature of the c and e antigens ). Notations of the two theories are used interchangeably in blood banking ( e.g., Rho ( D ) meaning RhD positive ). Wiener 's notation is more complex and cumbersome for routine use. Because it is simpler to explain, the Fisher - Race theory has become more widely used. DNA testing has shown that both are partially correct. There are in fact two linked genes, the RHD gene which produces a single immune specificity ( anti-D ) and the RHCE gene with multiple specificities ( anti-C, anti-c, anti-E, anti-e ). Thus, Wiener 's postulate that a gene could have multiple specificities ( something many did not give credence to originally ) has been proven correct. On the other hand, Wiener 's theory that there is only one gene has proven incorrect, as has the Fischer - Race theory that there are three genes, rather than the 2. The CDE notation used in the Fisher - Race nomenclature is sometimes rearranged to DCE to more accurately represent the co-location of the C and E encoding on the RhCE gene, and to make interpretation easier. Rh system antigens The proteins which carry the Rh antigens are transmembrane proteins, whose structure suggest that they are ion channels. The main antigens are D, C, E, c and e, which are encoded by two adjacent gene loci, the RHD gene which encodes the RhD protein with the D antigen ( and variants ) and the RHCE gene which encodes the RhCE protein with the C, E, c and e antigens ( and variants ). There is no d antigen. Lowercase `` d '' indicates the absence of the D antigen ( the gene is usually deleted or otherwise nonfunctional ). Rh phenotypes are readily identified through the presence or absence of the Rh surface antigens. As can be seen in the table below, most of the Rh phenotypes can be produced by several different Rh genotypes. The exact genotype of any individual can only be identified by DNA analysis. Regarding patient treatment, only the phenotype is usually of any clinical significance to ensure a patient is not exposed to an antigen they are likely to develop antibodies against. A probable genotype may be speculated on, based on the statistical distributions of genotypes in the patient 's place of origin. R ( cDe or Dce ) is today most common in Africa. The allele was thus often assumed in early blood group analyses to have been typical of populations on the continent ; particularly in areas below the Sahara. Given the presence of high R percentages among Sephardim and Ashkenazim Jews compared to native European populations and the relative genetic isolation of Ashkenazim, Ottensooser et al. ( 1963 ) therefore suggested that high R frequencies were likely characteristic of the ancient Judea Jews, who had emigrated from Egypt prior to their dispersal throughout the Mediterranean Basin and Europe. However, more recent studies have found R frequencies as low as 24.3 % among some Afroasiatic - speaking groups in the Horn of Africa, as well as higher R frequencies among certain other Afroasiatic speakers in North Africa ( 37.3 % ) and among some Palestinians in the Levant ( 30.4 % ). Rh phenotypes and genotypes Phenotype expressed on cell Genotype expressed in DNA Prevalence ( % ) Fisher - Race notation Wiener notation D+ C+ E+ c+ e+ ( RhD+ ) Dce / DCE 0.0125 Dce / dCE R r 0.0003 DCe / DcE 11.8648 DCe / dcE R r '' 0.9992 DcE / dCe R r ′ 0.2775 DCE / dce R r 0.1893 D+ C+ E+ c+ e − ( RhD+ ) DcE / DCE 0.0687 DcE / dCE R r 0.0014 DCE / dcE R r '' 0.0058 D+ C+ E+ c − e+ ( RhD+ ) DCe / dCE R r 0.0042 DCE / dCe R r ′ 0.0048 DCe / DCE 0.2048 D+ C+ E+ c − e − ( RhD+ ) DCE / DCE 0.0006 DCE / dCE R r < 0.0001 D+ C+ E − c+ e+ ( RhD+ ) Dce / dCe R r ′ 0.0505 DCe / dce R r 32.6808 DCe / Dce 2.1586 D+ C+ E − c − e+ ( RhD+ ) DCe / DCe 17.6803 DCe / dCe R r ′ 0.8270 D+ C − E+ c+ e+ ( RhD+ ) DcE / Dce 0.7243 Dce / dcE R r '' 0.0610 DcE / dce R r 10.9657 D+ C − E+ c+ e − ( RhD+ ) DcE / DcE 1.9906 DcE / dcE R r '' 0.3353 D+ C − E − c+ e+ ( RhD+ ) Dce / Dce 0.0659 Dce / dce R r 1.9950 D − C+ E+ c+ e+ ( RhD − ) dce / dCE rr 0.0039 dCe / dcE r ′ r '' 0.0234 D − C+ E+ c+ e − ( RhD − ) dcE / dCE r '' r 0.0001 D − C+ E+ c − e+ ( RhD − ) dCe / dCE r ′ r 0.0001 D − C+ E+ c − e − ( RhD − ) dCE / dCE r r < 0.0001 D − C+ E − c+ e+ ( RhD − ) dce / dCe rr ′ 0.7644 D − C+ E − c − e+ ( RhD − ) dCe / dCe r ′ r ′ 0.0097 D − C − E+ c+ e+ ( RhD − ) dce / dcE rr '' 0.9235 D − C − E+ c+ e − ( RhD − ) dcE / dcE r '' r '' 0.0141 D − C − E − c+ e+ ( RhD − ) dce / dce rr 15.1020 † Figures taken from a study performed in 1948 on a sample of 2000 people in the United Kingdom. Rh phenotypes in patients and donors in Turkey Rh Phenotype CDE Patients ( % ) Donors ( % ) R r CcDe 37.4 33.0 CcDEe 35.7 30.5 CDe 5.7 21.8 rr ce 10.3 11.6 R r cDEe 6.6 10.4 cDe 2.8 2.7 cDE 2.8 2.4 rr '' cEe -- 0.98 CDE -- 0.03 rr ′ Cce 0.8 -- Hemolytic disease of the newborn Main article : Hemolytic disease of the newborn The hemolytic condition occurs when there is an incompatibility between the blood types of the mother and the fetus. There is also potential incompatibility if the mother is Rh negative and the father is positive. When any incompatibility is detected, the mother often receives an injection at 28 weeks gestation and at birth to avoid the development of antibodies toward the fetus. These terms do not indicate which specific antigen - antibody incompatibility is implicated. The disorder in the fetus due to Rh D incompatibility is known as erythroblastosis fetalis. Hemolytic comes from two words : `` hema '' ( blood ) and `` lysis '' ( solution ) or breaking down of red blood cells Erythroblastosis refers to the making of immature red blood cells Fetalis refers to the fetus. When the condition is caused by the Rh D antigen - antibody incompatibility, it is called Rh D Hemolytic disease of the newborn or Rh disease. Here, sensitization to Rh D antigens ( usually by feto - maternal transfusion during pregnancy ) may lead to the production of maternal IgG anti-D antibodies which can pass through the placenta. This is of particular importance to D negative females at or below childbearing age, because any subsequent pregnancy may be affected by the Rh D hemolytic disease of the newborn if the baby is D positive. The vast majority of Rh disease is preventable in modern antenatal care by injections of IgG anti-D antibodies ( Rho ( D ) Immune Globulin ). The incidence of Rh disease is mathematically related to the frequency of D negative individuals in a population, so Rh disease is rare in old - stock populations of Africa and the eastern half of Asia, and the Indigenous peoples of Oceania and the Americas, but more common in other genetic groups, most especially Western Europeans, but also other West Eurasians, and to a lesser degree, native Siberians, as well as those of mixed - race with a significant or dominant descent from those ( e.g. the vast majority of Latin Americans and Central Asians ). Symptoms and signs in the fetus : Enlarged liver, spleen, or heart and fluid buildup in the fetus ' abdomen seen via ultrasound. Symptoms and signs in the newborn : Anemia that creates the newborn 's pallor ( pale appearance ). Jaundice or yellow discoloration of the newborn 's skin, sclera or mucous membrane. This may be evident right after birth or after 24 -- 48 hours after birth. This is caused by bilirubin ( one of the end products of red blood cell destruction ). Enlargement of the newborn 's liver and spleen. The newborn may have severe edema of the entire body. Dyspnea or difficulty breathing. Population data The frequency of Rh factor blood types and the RhD neg allele gene differs in various populations. Population data for the Rh D factor and RhD neg allele Population Rh ( D ) Neg Rh ( D ) Pos Rh ( D ) Neg alleles African Americans ∼ 7 % 93 % ∼ 26 % Basques 21 % - 36 % 65 % ∼ 60 % Britain 17 % 83 % China < 1 % > 99 % Ethiopians 1 % - 21 % 99 % - 79 % Europeans ( others ) 16 % 84 % 40 % India 0.6 % - 8.4 % 99.4 % - 91.6 % Indonesia < 1 % > 99 % Japan < 1 % > 99 % Koreans < 1 % > 99 % Madagascar 1 % 99 % Moroccans 9.5 % 90.5 % Moroccans ( High Atlas ) ∼ 29 % 71 % Native Americans ∼ 1 % 99 % ∼ 10 % Nigeria 6 % 94 % Saudi Arabia 8.8 % 91.2 % 29.5 % Subequatorial Africa 1 % - 3 % 99 % - 97 % United States 15 % 85 % Inheritance If both of a child 's parents are Rh negative, the child will definitely be Rh negative. Otherwise the child may be Rh positive or Rh negative, depending on the parents ' specific genotypes. The D antigen is inherited as one gene ( RHD ) ( on the short arm of the first chromosome, p36. 13 -- p34. 3 ) with various alleles. Though very much simplified, one can think of alleles that are positive or negative for the D antigen. The gene codes for the RhD protein on the red cell membrane. D − individuals who lack a functional RHD gene do not produce the D antigen, and may be immunized by D+ blood. The epitopes for the next 4 most common Rh antigens, C, c, E and e are expressed on the highly similar RhCE protein that is genetically encoded in the RHCE gene, also found on chromosome 1. It has been shown that the RHD gene arose by duplication of the RHCE gene during primate evolution. Mice have just one RH gene. The RHAG gene, which is responsible for encoding Rh - associated glycoprotein ( RhAG ), is found on chromosome 6a. The polypeptides produced from the RHD and RHCE genes form a complex on the red blood cell membrane with the Rh - associated glycoprotein. Function On the basis of structural homology it has been proposed that the product of RHD gene, the RhD protein, is a membrane transport protein of uncertain specificity ( CO or NH ) and unknown physiological role. The three - dimensional structure of the related RHCG protein and biochemical analysis of the RhD protein complex indicates that the RhD protein is one of three subunits of an ammonia transporter. Three recent studies have reported a protective effect of the RhD - positive phenotype, especially RhD heterozygosity, against the negative effect of latent toxoplasmosis on psychomotor performance in infected subjects. RhD - negative compared to RhD - positive subjects without anamnestic titres of anti-Toxoplasma antibodies have shorter reaction times in tests of simple reaction times. And conversely, RhD - negative subjects with anamnestic titres ( i.e. with latent toxoplasmosis ) exhibited much longer reaction times than their RhD - positive counterparts. The published data suggested that only the protection of RhD - positive heterozygotes was long term in nature ; the protection of RhD - positive homozygotes decreased with duration of the infection while the performance of RhD - negative homozygotes decreased immediately after the infection. The overall change in reaction times was always larger in the RhD - negative group than in the RhD - positive. Origin of RhD polymorphism This section possibly contains original research. Please improve it by verifying the claims made and adding inline citations. Statements consisting only of original research should be removed. ( December 2009 ) For a long time, the origin of RHD polymorphism was an evolutionary enigma. Before the advent of modern medicine, the carriers of the rarer allele ( e.g. RhD - negative women in a population of RhD positives or RhD - positive men in a population of RhD negatives ) were at a disadvantage as some of their children ( RhD - positive children born to preimmunised RhD - negative mothers ) were at a higher risk of fetal or newborn death or health impairment from hemolytic disease. It was suggested that higher tolerance of RhD - positive heterozygotes against Toxoplasma - induced impairment of reaction time and Toxoplasma - induced increase of risk of traffic accident could counterbalance the disadvantage of the rarer allele and could be responsible both for the initial spread of the RhD allele among the RhD - negative population and for a stable RhD polymorphism in most human populations. It was also suggested that differences in the prevalence of Toxoplasma infection between geographical regions ( 0 -- 95 % ) could also explain the striking variation in the frequency of RhD - negative alleles between populations. According to some parasitologists, it is possible that the better psychomotor performance of RhD - negative subjects in the Toxoplasma - free population could be the reason for spreading of the `` d allele '' ( deletion ) in the European population. In contrast to the situation in Africa and certain ( but not all ) regions of Asia, the abundance of wild cats ( definitive hosts of Toxoplasma gondii ) in Europe was very low before the advent of the domestic cat. Weak D In serologic testing, D positive blood is easily identified. Units which are D negative are often retested to rule out a weaker reaction. This was previously referred to as D, which has been replaced. By definition, weak D phenotype is characterized by negative reaction with anti-D reagent at immediate spin ( IS ), negative reaction after 37 ° C incubation, and positive reaction at anti-human globulin ( AHG ) phase. Weak D phenotype can occur in several ways. In some cases, this phenotype occurs because of an altered surface protein that is more common in people of European descent. An inheritable form also occurs, as a result of a weakened form of the R0 gene. Weak D may also occur as `` C in trans '', whereby a C gene is present on the opposite chromosome to a D gene ( as in the combination R0r ', or `` Dce / dCe '' ). The testing is difficult, since using different anti-D reagents, especially the older polyclonal reagents, may give different results. The practical implication of this is that people with this sub-phenotype will have a product labeled as `` D positive '' when donating blood. When receiving blood, they are sometimes typed as a `` D negative '', though this is the subject of some debate. Most `` Weak D '' patients can receive `` D positive '' blood without complications. However, it is important to correctly identify the ones that have to be considered D+ or D −. This is important, since most blood banks have a limited supply of `` D negative '' blood and the correct transfusion is clinically relevant. In this respect, genotyping of blood groups has much simplified this detection of the various variants in the Rh blood group system. Partial D It is important to differentiate weak D ( due to a quantitative difference in the D antigen ) from partial D ( due to a qualitative difference in the D antigen ). Simply put, the weak D phenotype is due to a reduced number of D antigens on a red blood cell. In contrast, the partial D phenotype is due to an alteration in D - epitopes. Thus, in partial D, the number of D antigens is not reduced but the protein structure is altered. These individuals, if alloimmunized to D, can produce an anti-D antibody. Therefore, partial D patients who are donating blood should be labeled as D - positive but, if receiving blood, they should be labeled as D - negative and receive D - negative units. In the past, partial D was called ' D mosaic ' or ' D variant. ' Different partial D phenotypes are defined by different D epitopes on the outer surface of the red blood cell membrane. More than 30 different partial D phenotypes have been described. Rh phenotype Rh individuals have no Rh antigens ( no Rh or RhAG ) on their red blood cells. This condition is rare. As a consequence of Rh antigen absence, Rh red blood cells also lack LW and Fy5 and show weak expression of S, s, and U antigens. Red blood cells lacking Rh / RhAG proteins have structural abnormalities ( such as stomatocytosis ) and cell membrane defects that can result in hemolytic anemia. Other Rh group antigens Currently, 50 antigens have been described in the Rh group system ; among those described here, the D, C, c, E and e antigens are the most important. The others are much less frequently encountered or are rarely clinically significant. Each is given a number, though the highest assigned number ( CEST or RH57 according to the ISBT terminology ) is not an accurate reflection of the antigens encountered since many ( e.g. Rh38 ) have been combined, reassigned to other groups, or otherwise removed. Rh antibodies Rh antibodies are IgG antibodies which are acquired through exposure to Rh - positive blood ( generally either through pregnancy or transfusion of blood products ). The D antigen is the most immunogenic of all the non-ABO antigens. 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External links Rh at BGMUT Blood Group Antigen Gene Mutation Database at NCBI, NIH Article commemorating the first appearance of the Rh factor in the New York Times Transfusion medicine General concepts Apheresis ( plasmapheresis, plateletpheresis, leukapheresis ) Blood transfusion Coombs test ( direct and indirect ) Cross-matching Exchange transfusion International Society of Blood Transfusion Intraoperative blood salvage ISBT 128 Transfusion reactions Blood group systems / blood types ABO Chido - Rodgers Colton Cromer Diego Dombrock Duffy Er FORS Gerbich GIL GLOB Hh Ii Indian JR JMH Kell ( Xk ) Kidd Knops Lan Lewis Lutheran LW MNS OK Raph Rh and RHAG Scianna T - Tn Vel Xg Yt Other Blood products / blood donation Whole blood Platelets Red blood cells Plasma / Fresh frozen plasma / PF24 ( Cryoprecipitate + Cryosupernatant ) Blood substitutes Retrieved from `` https://en.wikipedia.org/w/index.php?title=Rh_blood_group_system&oldid=848238864 '' Categories : Blood Blood antigen systems Hidden categories : CS1 maint : Explicit use of et al. CS1 maint : Uses authors parameter All articles with unsourced statements Articles with unsourced statements from June 2008 Articles with unsourced statements from July 2015 Articles that may contain original research from December 2009 All articles that may contain original research Talk Contents About Wikipedia Български Bosanski Català Dansk Deutsch ދިވެހިބަސް Español Euskara فارسی Français Gaeilge 한국어 Հայերեն Bahasa Indonesia Italiano עברית Қазақша Lietuvių Magyar Македонски 日本 語 Norsk Occitan Plattdüütsch Polski Português Русский Simple English தமிழ் Татарча / tatarça ไทย Українська Tiếng Việt 中文 26 more Edit links This page was last edited on 30 June 2018, at 17 : 21 ( UTC ). Text is available under the Creative Commons Attribution - ShareAlike License ; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia ® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. About Wikipedia

Question: where does a rhesus negative blood come from
Answer: a child’s parents