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      Progressive trends in prenatal genetic screening Translated title: Tendencias progresivas en el cribado genético prenatal

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          Abstract

          Abstract According to the global report on birth defects in 2021, it is estimated that 8 million children are born with birth defects of genetic origin annually. These birth defects vary in their degree of severity; where some types are mild and do not require treatment but others may necessitate lifelong medications or even cause instant death just after birth. That is why prenatal screening is doubtless necessary to detect such genetic defects before birth aiming to drop the tragedy of these children off. Recently, this approach has been developing towards non-invasive techniques that reduce the risk of miscarriage, which was common in the old-fashioned invasive ones. Non-invasive Prenatal Tests (NIPTs) like Chromosomal Microarray Analysis (CMA) and cell-free fetal DNA (cffDNA) caused a breakthrough in the screening methods of chromosomal aneuploidies. Thanks to their benefits, NIPTs are considered a fundamental clinical approach for pregnant women’ screening in multiple countries. Thence, this paper gives prominence to the recentness of NIPTs along with each’s assets, liabilities, and prospective recommendations. In addition, it would demonstrate the importance of modern molecular technologies like next-generation sequencing (NGS) which are enforced for the appliance of NIPTs.

          Translated abstract

          Resumen Según el informe mundial sobre anomalías congénitas de 2021, se estima que anualmente nacen 8 millones de niños con anomalías congénitas de origen genético. Estos defectos de nacimiento varían en su grado de severidad; donde algunos tipos son leves y no requieren tratamiento, pero otros pueden necesitar medicamentos de por vida o incluso causar la muerte instantánea justo después del nacimiento. Por eso es sin duda necesario el cribado prenatal para detectar tales defectos genéticos antes del nacimiento con el fin de acabar con la tragedia de estos niños. Recientemente, este enfoque se ha ido desarrollando hacia técnicas no invasivas que reducen el riesgo de aborto espontáneo, que era común en las antiguas invasivas. Las pruebas prenatales no invasivas (NIPT) como el análisis de micromatrices cromosómicas (CMA) y el ADN fetal libre de células (cffDNA) provocaron un gran avance en los métodos de detección de aneuploidías cromosómicas. Gracias a sus beneficios, las NIPT se consideran un enfoque clínico fundamental para la detección de mujeres embarazadas en múltiples países. Por lo tanto, este documento destaca la actualidad de los NIPT junto con los activos, pasivos y recomendaciones prospectivas de cada uno. Además, demostraría la importancia de las tecnologías moleculares modernas, como la secuenciación de próxima generación (NGS), que se aplican para la aplicación de NIPT.

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          Most cited references37

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          Size-based molecular diagnostics using plasma DNA for noninvasive prenatal testing.

          Noninvasive prenatal testing using fetal DNA in maternal plasma is an actively researched area. The current generation of tests using massively parallel sequencing is based on counting plasma DNA sequences originating from different genomic regions. In this study, we explored a different approach that is based on the use of DNA fragment size as a diagnostic parameter. This approach is dependent on the fact that circulating fetal DNA molecules are generally shorter than the corresponding maternal DNA molecules. First, we performed plasma DNA size analysis using paired-end massively parallel sequencing and microchip-based capillary electrophoresis. We demonstrated that the fetal DNA fraction in maternal plasma could be deduced from the overall size distribution of maternal plasma DNA. The fetal DNA fraction is a critical parameter affecting the accuracy of noninvasive prenatal testing using maternal plasma DNA. Second, we showed that fetal chromosomal aneuploidy could be detected by observing an aberrant proportion of short fragments from an aneuploid chromosome in the paired-end sequencing data. Using this approach, we detected fetal trisomy 21 and trisomy 18 with 100% sensitivity (T21: 36/36; T18: 27/27) and 100% specificity (non-T21: 88/88; non-T18: 97/97). For trisomy 13, the sensitivity and specificity were 95.2% (20/21) and 99% (102/103), respectively. For monosomy X, the sensitivity and specificity were both 100% (10/10 and 8/8). Thus, this study establishes the principle of size-based molecular diagnostics using plasma DNA. This approach has potential applications beyond noninvasive prenatal testing to areas such as oncology and transplantation monitoring.
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            Expanding the scope of noninvasive prenatal testing: detection of fetal microdeletion syndromes.

            The purpose of this study was to estimate the performance of a single-nucleotide polymorphism (SNP)-based noninvasive prenatal test for 5 microdeletion syndromes.
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              Single-nucleotide polymorphism-based noninvasive prenatal screening in a high-risk and low-risk cohort.

              To estimate performance of a single-nucleotide polymorphism-based noninvasive prenatal screen for fetal aneuploidy in high-risk and low-risk populations on single venopuncture. One thousand sixty-four maternal blood samples from 7 weeks of gestation and beyond were included; 1,051 were within specifications and 518 (49.3%) were low risk. Cell-free DNA was amplified, sequenced, and analyzed using the Next-generation Aneuploidy Test Using SNPs algorithm. Samples were called as trisomies 21, 18, 13, or monosomy X, or euploid, and male or female. Nine hundred sixty-six samples (91.9%) successfully generated a cell-free DNA result. Among these, sensitivity was 100% for trisomy 21 (58/58, confidence interval [CI] 93.8-100%), trisomy 13 (12/12, CI 73.5-100%), and fetal sex (358/358 female, CI 99.0-100%; 418/418 male, CI 99.1-100%), 96.0% for trisomy 18 (24/25, CI 79.7-99.9%), and 90% for monosomy X (9/10, CI 55.5-99.8%). Specificity for trisomies 21 and 13 was 100% (905/905, CI 99.6-100%; and 953/953, CI 99.6-100%, respectively) and for trisomy 18 and monosomy X was 99.9% (938/939, CI 99.4-100%; and 953/954, CI 99.4-100%, respectively). However, 16% (20/125) of aneuploid samples did not return a result; 50% (10/20) had a fetal fraction below the 1.5th percentile of euploid pregnancies. Aneuploidy rate was significantly higher in these samples (P<.001, odds ratio 9.2, CI 4.4-19.0). Sensitivity and specificity did not differ in low-risk and high-risk populations. This noninvasive prenatal screen performed with high sensitivity and specificity in high-risk and low-risk cohorts. Aneuploid samples were significantly more likely to not return a result; the number of aneuploidy samples was especially increased among samples with low fetal fraction. This underscores the importance of redraws or, in rare cases, invasive procedures based on low fetal fraction. II.
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                Author and article information

                Journal
                ijm
                Iberoamerican Journal of Medicine
                Iberoam J Med
                Hospital San Pedro (Logroño, La Rioja, Spain )
                2695-5075
                2695-5075
                2022
                : 4
                : 4
                : 229-236
                Affiliations
                [1] Cairo orgnameHelwan University orgdiv1Faculty of Medicine and Surgery Egypt
                Article
                S2695-50752022000400009 S2695-5075(22)00400400009
                10.53986/ibjm.2022.0032
                6d2ef229-719b-41b5-b5a1-439ec26ffef1

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 21 August 2022
                : 22 July 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 38, Pages: 8
                Product

                SciELO Spain

                Categories
                Review

                Secuenciación de última generación,Chromosomal microarray,Chorionic villus sampling,Maternal plasma,Fetal nucleated red blood cells,Next generation sequencing,Pruebas prenatales no invasivas,ADN fetal libre de células,Micromatrices cromosómicas,Muestreo de vellosidades coriónicas,Plasma materno,Glóbulos rojos fetales nucleados,Non-invasive prenatal tests,Cell free fetal DNA

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