Gao Y, Ruan L, Cao L, Lu G, Hong Q, Zhang Q, Teng Y, Wang Z. Noninvasive isolation of transcervical trophoblast cells for fetal identification.
J Obstet Gynaecol Res 2022;
48:1613-1620. [PMID:
35451149 DOI:
10.1111/jog.15256]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 03/16/2022] [Accepted: 03/27/2022] [Indexed: 11/30/2022]
Abstract
OBJECTIVE
To identify trophoblastic cells retrieved from the cervix at a gestational age (GA) of 5-9 weeks by a noninvasive modality in fetuses.
METHOD
Transcervical cells (TCCs) were noninvasively extracted by a cytobrush using the Papanicolaou sampling method. TCCs were immunostained with antihuman leukocyte antigen (HLA)-G and anticytokeratin (CK)-7 antibodies to identify trophoblastic cells. Maternal finger blood, gestational sacs, and 20 trophoblastic cells collected by a laser-guided microscopic single-cell capture system were examined and compared by short tandem repeat (STR) genotyping.
RESULTS
Forty-nine pregnant women with GA of 5-9 weeks and six nonpregnant healthy women were included in the study. Trophoblastic cells were identified in 37 (75.5%) TCC samples, among which 34 (69.4%) were eligible for STR genotyping analysis. No trophoblastic cells were identified in nonpregnant healthy women. The STR genotyping analyses revealed 24 female and 10 male fetuses. TCC trophoblastic cells exhibited the same STR profiles as gestational sac and maternal blood in all samples, which indicated that the TCC trophoblastic cells originated from fetuses.
CONCLUSION
This primary study validated that trophoblastic cells from TCCs at GA 5-9 weeks originated from the fetus. Further studies are needed to verify whether this method can be used for early noninvasive prenatal diagnosis and paternity testing.
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