Differential expansion of fetal stem cells in the maternal...

C - Chemistry – Metallurgy – 12 – Q

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C12Q 1/68 (2006.01) G01N 33/567 (2006.01) G01N 33/569 (2006.01) G01N 33/68 (2006.01) G01N 33/72 (2006.01) C12N 5/08 (2006.01) C12N 5/06 (2006.01)

Patent

CA 2186366

The methods of the present in- vention use blood of pregnant females and fetal cell amplification to facilitate prenatal diagnosis without invading fe- tal space. This method is less invasive and simpler than amniocentesis or chori- onic villus sampling because it involves only drawing blood from the mother to obtain a fetal cell sample. If there is a specific disease with known molecu- lar mutations being sought, cells from the sample are a source of DNA en- riched for fetal material. If the disease is one involving red cells, this method provides fetal red cells for analysis. If the disease involves white cells, differ- ent cytokines can be used to selectively produce fetal leukocytes. When an ab- normal chromosome pattern without a specific diagnostic risk (e g., advanced maternal age) is being sought, then the culture method provides dividing cells of fetal origin.

Selon les procédés de la présente invention, le sang de femmes enceintes et l'amplification des cellules foetales sont utilisées pour faciliter le diagnostic prénatal sans invasion de l'espace foetal. Ce procédé est moins invasif et plus simple que l'amniocentèse ou l'échantillonnage de villosités chorioniques dans la mesure où il n'implique qu'un prélèvement du sang maternel pour obtenir un échantillon des cellules foetales. Si une maladie spécifique présentant des mutations moléculaires connues est recherchée, les cellules de l'échantillon représentent une source d'ADN enrichie en substances foetales. Si la maladie implique les globules rouges, ce procédé permet d'obtenir des globules rouges foetaux à des fins d'analyse. Si la maladie implique les leucocytes, différentes cytokines peuvent être utilisées pour produire sélectivement des leucocytes foetaux. Lorsqu'un motif chromosomique anormal n'impliquant pas de risque diagnostique spécifique (tel qu'un âge maternel avancé) est recherché, la méthode de culture comprend la division de cellules d'origine foetale.

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