DNA sequencing of maternal plasma to identify Down syndrome and other trisomies in multiple gestations.
Prenat Diagn
; 32(8): 730-4, 2012 Aug.
Article
em En
| MEDLINE
| ID: mdl-22585317
ABSTRACT
OBJECTIVE:
Studies on prenatal testing for Down syndrome (trisomy 21), trisomy 18, and trisomy 13 by massively parallel shotgun sequencing (MPSS) of circulating cell free DNA have been, for the most part, limited to singleton pregnancies. If MPSS testing is offered clinically, it is important to know if these trisomies will also be identified in multiple pregnancies.METHOD:
Among a cohort of 4664 high-risk pregnancies, maternal plasma samples were tested from 25 twin pregnancies (17 euploid, five discordant and two concordant for Down syndrome; one discordant for trisomy 13) and two euploid triplet pregnancies [Correction made here after initial online publication.]. Results were corrected for GC content bias. For each target chromosome (21, 18, and 13), z-scores of 3 or higher were considered consistent with trisomy.RESULTS:
Seven twin pregnancies with Down syndrome, one with trisomy 13, and all 17 twin euploid pregnancies were correctly classified [detection rate 100%, 95% confidence interval (CI) 59%-100%, false positive rate 0%, 95% CI 0%-19.5%], as were the two triplet euploid pregnancies.CONCLUSION:
Although study size is limited, the underlying biology combined with the present data provide evidence that MPSS testing can be reliably used as a secondary screening test for Down syndrome in women with high-risk twin gestations.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Trissomia
/
Síndrome de Down
/
Gravidez de Gêmeos
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article