【摘要】 目的了解福建省人群中H抗原缺乏血型的表型频率,研究其血清学和遗传学特征。方法用单克隆抗H试剂进行H抗原缺乏血型筛查;对经筛检出及其它来源的H抗原缺乏血型标本进行血清学分析及ABO血型初步鉴定;使用PCR-SSP进行ABO基因分型;对PCR扩增FUT1和FUT2基因的蛋白编码区产物进行测序,了解其基因型及核酸序列突变情况。结果从85390名献血者中检出10例H抗原缺乏血型,均为类孟买型(分泌型)。对14份类孟买型标本进行FUT1基因分析,检测出h1(nt547-552Δag)、h2(nt880-882Δtt)、h3(nt658c→t)和hnew-2(nt328g→a)4种隐性等位基因。这些个体的基因型分别为h1/h1(6例)、h1/h2(7例)和h3/hnew-2(1例),其中h1等位基因占67.85%,h2等位基因占25.00%。共检测12例类孟买型标本的FUT2基因,发现均存在纯合的nt357c→t突变,在FUT1基因型为h1/h2的个体中还检出nt716g→a突变,均为杂合子。未发现其它FUT2无效基因。血清学分析发现所有个体的不规则抗-A或抗-B在37℃中均无活性,而有7份标本血清中存在37℃具有活性的抗-H或抗-HI。结论福建省人群中类孟买型的表型频率估计约为1∶8 500。在福建省类孟买型个体中h1和h2等位基因具有一定的地域流行特征,存在h1-Se357和h2-Se357,716的单元型连锁遗传。更多还原

【Abstract】 Objective To survey the frequency of H deficient phenotype in blood donor population and analyze the serological and genetic characteristics of these individuals.Methods The H deficient phenotype was screened with anti-H monoclonal antibody.The ABO type was screened with serological method and with sequence specific primer polymerase chain reaction（PCR-SSP）.FUT1 and FUT2 gene sequences were analyzed with direct sequencing of PCR products and gene cloning products.Result Of 85 390 blood donors,ten individuals were identified to be para-Bombay phenotype.Four h alleles were found in 14 para-Bombay phenotype individuals,h1（nt547-552Δag）,h2（nt880-882Δtt）,h3（nt658c→t）,and h_new-2（nt328g→a）.The FUT1 genotypes of these para-Bombay individuals were h1/h1（6 individuals）,h1/h2（7 individuals） and h3/h_new2（1 individual）,and the frequency of 4 allele were 67.85%（h1）,25%（h2）,3.57%（h3）,and 3.57%(h_new-2),respectively.FUT2 gene was analyzed in 12 para-Bombay phenotype individuals,and a mutation of nt357c→t was detected in all FUT2 gene,another mutation of nt716g→a were heterozygous in 5 individuals with h1/h2 genotype.No null FUT2 gene was detected.In serological analysis,all atypical anti-A or anti-B antibody of 14 para-Bombay individuals were inactive at 37℃,7 individuals had active anti-H antibody at 37℃.Conclusion The frequency of H deficient phenotype in Fujian population is about 1:8 500.The h1 and h2 alleles are predominant in Fujian H deficient individuals on h1-Se³⁵⁷ and h2-Se^357,716 haplotype background.更多还原