JournalofForensicMedicine,June2023,Vol.39,No.3三个体组合半同胞关系鉴定分析李海霞1,2,陈慧2,李燃2,臧钰2,孙宏钰21.广东警官学院刑事技术系,广东广州510000;2.中山大学中山医学院法医学系,广东广州510089摘要:目的建立常见的三个体参与进行半同胞关系鉴定的分析方法。方法针对已知关系的母亲、爷爷或叔叔和两个有争议的半同胞参与的鉴定场景,分别设定两个对立假设,按照孟德尔遗传定律进行家系重建,推导半同胞亲缘关系指数计算公式。通过实际案件进行验证,并与两个体配对半同胞关系鉴定比较。结果在母亲、爷爷和叔叔分别参与的三个体半同胞鉴定场景,分别推算得到54、91及99种基因型组合的亲缘关系指数计算公式。实际案例分析结果显示,与两个体配对半同胞鉴定相比,三个体参与半同胞鉴定的亲缘关系指数均增大。结论增加已知亲属参与半同胞关系鉴定有利于获得更多的遗传信息进行家系重建,提高半同胞关系鉴定的遗传证据强度。关键词:法医遗传学;亲缘关系;家系重建;三个体组合半同胞鉴定;亲缘关系指数文章编号:1004-5619(2023)03-0254-08中图分类号:R89;DF795.2;D919.2doi:10.12116/j.issn.1004-5619.2021.511202文献标志码:AAnalysisofTrioHalfSiblingTestingLIHai-xia1,2,CHENHui2,LIRan2,ZANGYu2,SUNHong-yu21.DepartmentofCriminalTechnology,GuangdongPoliceCollege,Guangzhou510000,China;2.FacultyofForensicMedicine,ZhongshanSchoolofMedicine,SunYat-senUniversity,Guangzhou510089,ChinaAbstract:ObjectiveToestablishananalyticalmethodforhalfsiblingtestinginvolvingcommonthreerelatives’participation.MethodsBasedonthehalfsiblingtestingscenarioswiththeknownbiologicalmother,grandfatheroruncle,andtwounidentifiedcontroversialhalfsiblingsparticipating,twoopposinghy‐potheseswereset.LineagereconstructionaccordingtoMendel’slawofhereditywascarriedout,andthecalculationformulaofthehalfsiblingkinshipindexwasderived.Verificationofactualcaseswascarriedoutandtheresultswerecomparedwithduohalfsiblingtesting.ResultsInthescenariosoftheknownbiologicalmother,grandfatheranduncleparticipatinginhalfsiblingtesting,thekinshipcal‐culationformulaeof54,91and99genotypecombinationsforkinshipindexcalculationwerededucedrespectively.Theactualcasesshowedhigherkinshi...