Names for H (ISBT 018) Blood Group Alleles
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1 Names for H (ISBT 018) Blood Group Alleles v4.0_ (5) Names for H (ISBT 018) Blood Group Alleles General description: The H blood group system consists of one antigen, H, that is carried on glycolipids and glycoproteins on the RBC membrane, where it is synthesised by the fucosyltransferase product of the FUT1 gene; as well as on glycoproteins on epithelial cells and in body fluids, where it is synthesised by the fucosyltransferase product of the FUT2 gene. In group O individuals, H antigen is the terminal antigen however, in group A and B individuals, the H antigen serves as the precursor structure for A and B blood-group-specific glycosyltransferases. Thus, group O people will test strongly H+ whereas groups A, B and AB will express very little H antigen. Mutations that negatively affect the α2fuct1 enzyme activity (encoded by FUT1) will result in reduced or absent H production (and a concomitant decrease in A and/or B antigens in individuals where those enzymes are encoded). Total absence of H, A and B antigens is called the O h or Bombay phenotype. Weak expression is referred to as the parabombay phenotype. The enzymes α2fuct1and α2fuct2 are single pass type II membrane glycoproteins in the Golgi. The α2fuct1 protein consists of 365 amino acids and is encoded by FUT1 or H, if analysis is to predict a blood group antigen. The FUT2 gene produces two transcripts; one of 343 amino acids and another more abundant form of 332 amino acids. The longer transcript encodes a protein with approximately one fourth the enzymatic activity and the shorter form is considered to be the active enzyme. Thus, the numbers given below are counted from the second initiating codon. The α2fuct2 protein is encoded by FUT2 or Se, if analysis is to predict a blood group antigen. Gene name: FUT1 Number of exons: 4 Initiation codon: Beginning of exon 4 Stop codon: Within exon 4 GenBank #: NM_ Entrez Gene ID: 2523 Reference allele (shaded): Accession number M35531 Preferred: FUT1*01 Acceptable: H if inferred by hemagglutination/inhibition Page 1 of 5
2 Names for H (ISBT 018) Blood Group Alleles v4.0_ (5) RBC Phenotype Allele name Nucleotide change Exon Amino acid change H+ FUT1*01 H+ FUT1*02 c.35c>t 4 p.ala12val Alleles producing weak phenotypes H+weak FUT1*01W.01 c.293c>t 4 p.thr98met H+weak FUT1*01W.02 c.328g>a 4 p.ala110thr H+weak FUT1*01W.03 c.349c>t 4 p.his117tyr H+weak FUT1*01W.04 c.442g>t 4 p.asp148tyr H+weak FUT1*01W c.460t>c 4 p.tyr154his H+weak FUT1*01W c.460t>c; c.1042g>a 4 p.tyr154his; p.glu348lys H+weak FUT1*01W.07 c.491t>a 4 p.leu164his H+weak FUT1*01W.08 c.522c>a 4 p.phe174leu H+weak FUT1*01W.09 c.658c>t 4 p.arg220cys H+weak FUT1*01W.10 c.659g>a 4 p.arg220cys H+weak FUT1*01W.11 c.661c>t 4 p.arg221cys H+weak FUT1*01W.12 c.682a>g 4 p.met228val H+weak FUT1*01W.13 c.689a>c 4 p.gln230pro H+weak FUT1*01W.14 c.721t>c 4 p.tyr241his H+weak FUT1*01W.15 c.801g>c 4 p.trp267cys H+weak FUT1*01W.16 c.801g>t 4 p.trp267cys H+weak FUT1*01W.17 c.832g>a 4 p.asp278asn H+weak FUT1*01W.18 c.904_906insaac 4 p.302_303insasn H+weak FUT1*01W.19 c.917c>t 4 p.thr306ile H+weak FUT1*01W.20 c.990delg 4 p.330fs336ter H+weak FUT1*01W.21 c.235g>c 4 p.gly79arg H+weak FUT1*01W.22 c.991c>a 4 p.pro331thr H+weak FUT1*01W.23 c.424c>t 4 p.arg142trp H+weak FUT1*01W.24 c.649g>t 4 p.val217phe H+weak FUT1*01W.25 c.235g>c 4 p.gly79arg H+weak FUT1*01W.26 c.545g>a 4 p.arg182his H+weak FUT1*01W.27 c.958g>a 4 p.gly320arg H+weak FUT1*01W.28 c.896a>c 4 p.gln299pro H+weak FUT1*01W G>C 4 Val219Leu Page 2 of 5
3 Names for H (ISBT 018) Blood Group Alleles v4.0_ (5) RBC Phenotype Allele name Nucleotide change Exon Amino acid change H+weak FUT1*02W.01 c.269g>t 4 p.gly90val H+weak FUT1*02W.02 c.371t>g 4 p.phe124cys H+weak FUT1*02W.03 c.682a>g 4 p.met228val H+weak FUT1*02W.04 c.980a>c 4 p.asn327thr H+weak FUT1*02W.05 c.748c>t 4 Arg250Trp Null alleles H FUT1*01N.01 c.422g>a 4 p.trp141ter H FUT1*01N.02 c.461a>g 4 p.tyr154cys H FUT1*01N.03 c.462c>a 4 p.tyr154ter H FUT1*01N.04 c.513g>c 4 p.trp171cys H FUT1*01N.05 c.538c>t 4 p.gln180ter H FUT1*01N.06 c.547_548delag 4 p.183fs H FUT1*01N.07 c.586c>t 4 p.gln196ter H FUT1*01N.08 c.695g>a 4 p.trp232ter H FUT1*01N.09 c.725t>g 4 p.leu242arg H FUT1*01N.10 c.776t>a 4 p.val259glu H FUT1*01N.11 c.785g>a; c.786c>a 4 p.ser262lys H FUT1*01N.12 c.826c>t 4 p.gln276ter H FUT1*01N.13 c.880_882deltt 4 p.294fs H FUT1*01N.14 c.944c>t 4 p.ala315val H FUT1*01N.15 c.948c>g 4 p.tyr316ter H FUT1*01N.16 c.980a>c 4 p.asn327thr H FUT1*01N.17 c.1047g>c 4 p.trp349cys H FUT1*01N.18 c.684g>a 4 p.met228ile H FUT1*01N.19 c.694t>c 4 p.trp232pro H FUT1*01N.20 c.764_768delc 4 p.256fs H FUT1*02N G>A 4 Trp141Ter Note that H expression will be masked if a functional A or B allele is also inherited. Also, that H antigen may be weakly detectable on RBCs where FUT*01N homozygosity occurs, due to the adsorption of soluble H antigen synthesized by FUT2. Page 3 of 5
4 Names for H (ISBT 018) Blood Group Alleles v4.0_ (5) Gene name: FUT2 Number of exons: 2 Initiation codon: Beginning of exon 2 Stop codon: Within exon 2 GenBank #: NM_ Entrez Gene ID: 2524 Reference allele (shaded): Accession number U17894 Preferred: FUT2*01 Acceptable: Se if inferred by hemagglutination/inhibition Saliva Phenotype Allele name Nucleotide change Exon Amino acid change H+ FUT2*01 H+ FUT2*02 c.4g>a 2 p.ala2thr H+ FUT2*03.01 c.40a>g 2 p.ile14val H+ FUT2*03.02 c.40a>g; 113C>T 2 p.ile14val; Ala38Val H+ FUT2*03.03 c.40a>g; 481G>A 2 p.ile14val; Asp161Asn H+ FUT2*04 c.379c>t 2 p.arg127cys H+ FUT2*05 c.400g>a 2 p.val134ile H+ FUT2*06 c.481g>a 2 p.asp161asn H+ FUT2*07 c.665g>a 2 p.arg222his H+ FUT2*08 c.685g>a 2 p.val229met H+ FUT2*09 c.716 G>A 2 p.arg239gln H+ FUT2*10 c.748_750insgtg 2 p.249_250insval Weak phenotypes H+ w FUT2*01W.01 c.278c>t 2 p.ala93val H+ w FUT2*01W c.385a>t 2 p.ile129phe H+ w FUT2*01W c.385a>t, 617T>G 2 p.ile129phe, Val206Gly H+ w FUT2*01W c.385a>t, 841G>A 2 p.ile129phe, Gly281Arg H+ w FUT2*01W.03 c.853g>a 2 p.ala285thr Null phenotypes nucleotide polymorphisms H FUT2*01N.01 c.244g>a; 385A>T 2 p.ala82thr; Ile129Phe H FUT2*01N.02 c.428g>a; 739A>G 2 p.trp143ter; Gly247Ser H FUT2*01N.03 c.569g>a 2 p.arg190his H FUT2*01N.04 c.571c>t 2 p.arg191ter H FUT2*01N.05 c.628c>t 2 p.arg210ter Page 4 of 5
5 Names for H (ISBT 018) Blood Group Alleles v4.0_ (5) H FUT2*01N.06 c.658c>t 2 p.arg220ter H FUT2*01N.07 c.664c>t 2 p.arg222cys H FUT2*01N.08 c.685_686delgt 2 p.230fs234ter H FUT2*01N.09 c.688_690delgtc 2 p.del230val H FUT2*01N.10 c.400g>a; 760G>A 2 p.val134ile; Asp254Asn H FUT2*01N.11 c.778delc 2 p.259fs275ter H FUT2*01N.12 c.849g>a 2 p.trp283ter H FUT2*01N.13 c.868 G>A 2 p.gly290arg H FUT2*01N.14 c.950c>t 2 p.pro317leu H FUT2*01N.15 c.302c>t 2 p.pro101leu H FUT2*01N.16 c.960a>g 2 p.gly247ser H FUT2*01N.17 c.412g>a 2 p.gly138ser H FUT2*01N.18 c.818c>a 2 p.thr273asn Null phenotypes - Gene deletions H FUT2*0N.01 gene deletion - H FUT2*0N.02 coding region deleted - H FUT2*0N.03 H FUT *0N.04 fusion gene 1 between FUT2 and Sec1 - fusion gene 2 between FUT2 and Sec1 - Saliva phenotype is shown here to represent secreted H antigen in all body fluids Page 5 of 5
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