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    • 26. 发明申请
    • INFORMATICS ENHANCED ANALYSIS OF FETAL SAMPLES SUBJECT TO MATERNAL CONTAMINATION
    • 信息增强分析场效应物质污染
    • WO2013130848A1
    • 2013-09-06
    • PCT/US2013/028378
    • 2013-02-28
    • NATERA, INC.RABINOWITZ, MatthewBANER, JohanGEMELOS, GeorgeHILL, Matthew, M.SIGURJONSSON, Styrmir
    • RABINOWITZ, MatthewBANER, JohanGEMELOS, GeorgeHILL, Matthew, M.SIGURJONSSON, Styrmir
    • C12Q1/68
    • G06F19/18C12Q1/6827
    • The invention provides methods for chromosome copy number calling on genetic samples, such as fetal samples subject to contamination from maternal DNA. The present disclosure provides methods for determining the ploidy status of a chromosome in a fetus (such as a gestating fetus or a POC sample) from genotypic data measured from a mixed sample of DNA comprising DNA from both the mother of the fetus and from the fetus, and optionally from genotypic data from the mother and father. In some embodiments, the ploidy state is determined by using a joint distribution model to create a plurality of expected allele distributions for different possible fetal ploidy states given the parental genotypic data, and comparing the expected allelic distributions to the pattern of measured allelic distributions measured in the mixed sample, and choosing the ploidy state whose expected allelic distribution pattern most closely matches the observed allelic distribution pattern. The mixed sample of DNA may be preferentially enriched at a plurality of polymorphic loci in a way that minimizes the allelic bias, for example using massively multiplexed targeted PCR.
    • 本发明提供了染色体拷贝数调用基因样品的方法,例如受母体DNA污染的胎儿样品。 本公开提供了从包含来自胎儿母体和胎儿的DNA的DNA的混合样品测量的基因型数据中确定胎儿(例如胎儿胎儿或POC样品)中染色体的倍性状态的方法 ,以及来自母亲和父亲的基因型数据。 在一些实施方案中,通过使用联合分布模型来确定给定父母基因型数据的不同可能的胎儿倍性状态的多个预期等位基因分布,并将预期的等位基因分布与所测量的等位基因分布的模式进行比较来确定倍性状态 混合样品,并选择其预期等位基因分布模式与观察到的等位基因分布模式最为匹配的倍性状态。 DNA的混合样品可以以使等位基因偏倚最小化的方式优先富集在多个多态性位点,例如使用大规模复用的靶向PCR。