Objective To analyze the correlation between the expression of soluble glycoprotein A(GPA)in plasma of healthy blood donors and anti-M and anti-"Mia"antibodies.Methods Plasma from healthy donors from February 9,2022 to February 15,2023 was collected:irregular antibody-negative NN type(group Ⅰ,n=118)and MM type(group Ⅱ,n=51),anti-M antibody positive NN type(group Ⅲ,n=145)and anti-"Mia"antibody positive companion type(group Ⅳ,n= 87),the GPA content in plasma of different individuals in 4 groups was detected,and the difference in GPA expression was analyzed by t-test.Results The average plasma GPA contents in groupsⅠ,Ⅱ,Ⅲ and Ⅳ were 9.941±0.252,10.97±0.256,5.139±0.129 and 4.28±0.139ng/ml,respectively.The average GPA content of groups Ⅰ and Ⅱ was higher,and the average GPA content of groups Ⅲ and Ⅳ was lower,and the differences were statistically significant(all P＜0.01).Conclusion The GPA content in plasma of healthy donors with anti-M and anti-"Mia"antibodies was significantly lower than that of the antibody-negative group.The results of this study lay a foundation for further investigation of whether GPA in plasma has the ability to neutralize anti-M and anti-"Mia"antibodies,improve disease diagnosis and safe blood transfusion.

【Objective】 To analyze the polymorphism of erythrocyte membrane blood group glycoprotein A (GPA) related gene GYPA in high and low endemic population for clonidia sinensis infection, aimed at investigating the correlation between erythrocyte transmembrane glycoproteins and clonorchis sinensis infection. 【Methods】 From Dec 2019 to Jun 2020, anticoagulant blood samples were randomly collected in WuMing district (n=700) and GuiGang district (n=500 ) of Nanning city, and the IgG antibody to clonorchis sinensis in plasma was detected, and the DNA of leukocyte was extracted. The full-length exon and partial intron of GYPA gene were sequenced, mutations were characterized by gene cloning, and the risk of infection was calculated by chi-square test. 【Results】 The yield rate of IgG antibody was 62.7% (439/700) in WuMing district and 3.4% (17/500) in GuiGang district(P<0.05). The insertion of base C at the 54th position of intron-2 in GYPA gene caused the reading frame shift. The mutation was presented in 23.9% (105/439) and 17.6% (3/17) of the population with clonorchis sinensis exposure in WuMing and GuiGang area, respectively, while 49.4% (129/261) and 54.7% (264/483) in the negative population, respectively (P<0.05). 【Conclusion】 The infection rate of clonorchis sinensis in WuMing district was higher than that in GuiGang district. The mutation rate of reading frame shift caused by the insertion of base C at the 54th position of GYPA intron-2 was much lower in the positive population of clonorchis sinensis infection than the negative population, suggesting that the mutation is a protective gene in the negative population of clonorchis sinensis infection. It is necessary to study the mechanism of clonorchis sinensis infection and the mutation point of this gene in order to facilitate the early diagnosis of disease, blood transfusion management, treatment and prevention.