A proof-of-concept study on the effects of low total cfDNA content and solutions to increase the NIPT trisomy 21 detection rate.
J Clin Lab Anal
; 34(2): e23035, 2020 Feb.
Article
em En
| MEDLINE
| ID: mdl-31568605
ABSTRACT
BACKGROUND:
Non-invasive prenatal testing (NIPT) is routinely used in clinical practice for fetal trisomy screening, but low total cfDNA content and low fetal fraction (LFF) are two factors that affect the detection rate. Samples with low total cfDNA or LFF usually end up with "no-call" results, followed by the blood redraw and re-testing, which is inconvenient for pregnant women and clinicians.METHODS:
We created mock trisomy 21 (T21) samples to investigate the effects of low total cfDNA with low LFF and possible solutions to increase their detection rate.RESULTS:
Samples with low total cfDNA resulted in the decreased unique reads number and increased duplication rate. Abnormal correlations between library concentration and raw reads number and the coverage fluctuation value, ZsdNorm, were also discovered, suggesting that low total cfDNA could lead to the overestimation of the library concentration. Additionally, a non-reference-based derivative value method (DV method) was evaluated and the data demonstrated that the detection sensitivity of trisomy 21 was increased from 33.33% (6/18) to 94.44% (17/18) in samples with 5% fetal fraction comparing with the z-score approach, whereas for LFF (3.5%) group, the performance was raised from 0% to 35.29% (6/17).CONCLUSION:
Low total cfDNA has significant impacts on NIPT performance by altering sequencing quality. The non-reference-based DV method could increase the T21 detection rate in samples with limited cfDNA content and 5% fetal fraction, but it was not as effective for those with LFF.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Síndrome de Down
/
Testes para Triagem do Soro Materno
/
Ácidos Nucleicos Livres
/
Teste Pré-Natal não Invasivo
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Limite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
J Clin Lab Anal
Assunto da revista:
TECNICAS E PROCEDIMENTOS DE LABORATORIO
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
China