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Abstract: CROM antigen is a kind of expression in GPI blood group antigen on the cell membrane, is Ⅳ transmembrane protein, also known as the decay accelerating factor(DAF), complement regulatory proteins, and membrane CD55 differentiation antigens. The peptide chain has four ring-folded structures in which all CROM antigens are expressed. The main function of CROM glycoprotein is to regulate the complement system to protect host cells and tissues from damage by controlling the amount of complement C3 and adjusting the amount of inhibiting the production of C5. CROM antigens are polymorphic and missense mutations lead to different antigenicity expressions. CROM antigens can trigger a mild transfusion hemolysis.
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表 1 等位基因与编码的抗原
抗原名 抗原频率 对应抗原 核苷酸 外显子 氨基酸 CROM1 Cra 高频 679G(C) 6 Ala227(Pro) CROM2 Tca 高频 CROM3,CROM4 155G(T或C) 2 Arg52(Leu或Pro) CROM3 Tcb 第频 CROM2,CROM4 155G>T 2 Arg52Leu CROM4 Tcc 第频 CROM2,CROM3 155G>C 2 Arg52Pro CROM5 Dra 高频 596C(T) 5 Ser199(Leu) CROM6 Esa 高频 239T(A) 2 Ile80(Asn) CROM7 IFC 高频 (Various) CROM8 WESa 第频 CROM9 245T>C 2 Leu82Arg CROM9 WESb 高频 CROM8 245T(G) 2 Leu82(Arg) CROM10 UMC 高频 749C(T) 6 Thr250(Met) CROM11 GUTI 高频 719G(T) 6 Arg240(His) CROM12 SERF 高频 647C(T) 5 Pro216(Lys) CROM13 ZENA 高频 725T(G) 6 His242(Gln) CROM14 CROV 高频 466G(A) 3 Gln156(Lys) CROM15 CRAM 高频 740A(G) 6 Gln247(Arg) CROM16 CROZ 高频 389G(A) 3 Arg130(His) CROM17 CRUE 高频 639G(A) 5 Leu217(Trp) CROM18 CRAG 高频 173A(G) 2 Asp58(Gly) CROM19 CROK 高频 CROM20 KCAM 高频 表 2 Null表型基因(Inab表型)
基因型 基因名 核苷酸 外显子 氨基酸 CROM:-7或Inab CROM*01N.01 c.261G>A 2 p.Trp87Ter CROM:-7或Inab CROM*01N.02 c.263C>A 2 p.Ser88Ter -
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