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Xiong, L; Barrett, AN; Hua, R; Ho, SSY; Jun, L; Chan, KCA; Mei, Z; Choolani, M
BJOG : an international journal of obstetrics and gynaecology, March 2018, 2018-Mar, 2018-03-00, 20180301, Letnik: 125, Številka: 4Journal Article
Objective To evaluate whether targeted sequencing and relative mutation dosage can be used to diagnose correctly inheritance of maternal β‐thalassaemia mutations in cell‐free DNA. Design Feasibility study using samples collected in a prenatal clinic. Setting South East Asia. Population Couples where both partners were known to be carriers of one of four common β‐thalassaemia mutations or an HbE mutation, and therefore at risk of carrying a fetus affected with β‐thalassaemia. Methods 49 samples previously identified as having inherited a paternal β‐thalassaemia mutation were amplified using nested polymerase chain reaction (PCR), and then sequencing. Relative mutation dosage was used to classify the fetus as having inherited the wild‐type or mutant maternal allele. Main outcome measures Classification of the fetus as ‘unaffected’ (if the maternal wild‐type allele was inherited) or ‘affected’ with β‐thalassaemia (if the maternal mutant allele was inherited). Results A classification for inheritance of maternal allele was obtained in 48/49 samples (98.0%). A concordant call was made in 44/48 cases (91.7%): one false‐positive and three false‐negatives were obtained. Thus, we had an overall sensitivity of 87.5% 95% confidence interval (CI) 67.6–97.3% and a specificity of 95.8% (95% CI 78.9–99.9%) for inheritance of maternal genotype. Conclusions RMD for detection of inheritance of maternal β‐thalassaemia mutations has potential for clinical use. Our sequential approach could be applied to other single‐gene disorders. Tweetable NIPT for β‐thalassaemia achieved using nested‐PCR followed by relative mutation dosage. Tweetable NIPT for β‐thalassaemia achieved using nested‐PCR followed by relative mutation dosage.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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