De novo HRAS gene mutation associated with Costello syndrome identified by non‐invasive cell‐free fetal DNA screening

2020 ◽  
Author(s):  
Chidinma Nwakalor ◽  
Sara Said‐Delgado ◽  
Shifra Krinshpun ◽  
Milen Velinov
Keyword(s):  
Gene Mutation ◽  
De Novo ◽  
Costello Syndrome ◽  
Non Invasive ◽  
Fetal Dna ◽  
Cell Free Fetal Dna ◽  
Invasive Cell ◽  
Hras Gene

Diagnostic Value of Non-Invasive Prenatal Screening of β-thalassemia by Cell Free Fetal DNA and Fetal NRBC

2019 ◽  
Vol 19 (2) ◽  
pp. 105-111
Author(s):  
Nadia Shafei ◽  
Mohammad Saeed Hakhamaneshi ◽  
Massoud Houshmand ◽  
Siavash Gerayeshnejad ◽  
Fardin Fathi ◽  
...  
Keyword(s):  
Sensitivity And Specificity ◽  
Multiple Displacement Amplification ◽  
Diagnostic Value ◽  
Diagnostic Methods ◽  
Beta Thalassemia ◽  
Non Invasive ◽  
Fetal Dna ◽  
Prenatal Diagnostic ◽  
Cell Free Fetal Dna ◽  
Invasive Techniques

Background: Beta thalassemia is a common disorder with autosomal recessive inheritance. The most prenatal diagnostic methods are the invasive techniques that have the risk of miscarriage. Now the non-invasive methods will be gradually alternative for these invasive techniques. Objective: The aim of this study is to evaluate and compare the diagnostic value of two non-invasive diagnostic methods for fetal thalassemia using cell free fetal DNA (cff-DNA) and nucleated RBC (NRBC) in one sampling community. Methods: 10 ml of blood was taken in two k3EDTA tube from 32 pregnant women (mean of gestational age = 11 weeks), who themselves and their husbands had minor thalassemia. One tube was used to enrich NRBC and other was used for cff-DNA extraction. NRBCs were isolated by MACS method and immunohistochemistry; the genome of stained cells was amplified by multiple displacement amplification (MDA) procedure. These products were used as template in b-globin segments PCR. cff-DNA was extracted by THP method and 300 bp areas were recovered from the agarose gel as fetus DNA. These DNA were used as template in touch down PCR to amplify b-globin gen. The amplified b-globin segments were sequenced and the results compared with CVS resul. Results: The data showed that sensitivity and specificity of thalassemia diagnosis by NRBC were 100% and 92% respectively and sensitivity and specificity of thalassemia diagnosis by cff-DNA were 100% and 84% respectively. Conclusion: These methods with high sensitivity can be used as screening test but due to their lower specificity than CVS, they cannot be used as diagnostic test.

scholarly journals Non-Invasive Prenatal Testing: Current Perspectives and Future Challenges

Genes ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 15
Author(s):  
Luigi Carbone ◽  
Federica Cariati ◽  
Laura Sarno ◽  
Alessandro Conforti ◽  
Francesca Bagnulo ◽  
...  
Keyword(s):  
Prenatal Screening ◽  
Prenatal Testing ◽  
Non Invasive ◽  
Fetal Dna ◽  
Cell Free Fetal Dna ◽  
Common Causes ◽  
Future Challenges ◽  
Neurodevelopmental Impairment ◽  
Fetal Aneuploidies ◽  
Made In

Fetal aneuploidies are among the most common causes of miscarriages, perinatal mortality and neurodevelopmental impairment. During the last 70 years, many efforts have been made in order to improve prenatal diagnosis and prenatal screening of these conditions. Recently, the use of cell-free fetal DNA (cff-DNA) testing has been increasingly used in different countries, representing an opportunity for non-invasive prenatal screening of pregnant women. The aim of this narrative review is to describe the state of the art and the main strengths and limitations of this test for prenatal screening of fetal aneuploidies.

Current relevance of non-invasive prenatal study of cell-free fetal DNA in the mother’s blood and prospects for its application in mass screening of pregnant women in the Russian Federation

2021 ◽  
Vol 70 (1) ◽  
pp. 19-50
Author(s):  
Elena A. Kalashnikova ◽  
Andrey S. Glotov ◽  
Elena N. Andreyeva ◽  
Ilya Yu. Barkov ◽  
Galina Yu. Bobrovnik ◽  
...  
Keyword(s):  
Mass Screening ◽  
Russian Federation ◽  
Prenatal Screening ◽  
First Trimester ◽  
Screening Programs ◽  
Non Invasive ◽  
Fetal Dna ◽  
Prenatal Diagnostic ◽  
Cell Free Fetal Dna ◽  
The Russian Federation

This review article offers an analysis of application of cell-free fetal DNA non-invasive prenatal screening test for chromosome abnormalities in the mothers blood in different countries. The diagnostic capacities of the method, its limitations, execution models and ethical aspects pertinent to its application are discussed. The data for the discordant results is shown and analyzed. The advantages of the genome-wide variant of cell-free fetal DNA analysis and the problems concerning its application in the mass screening are described. The main suggestion is to implement the contingent cell-free fetal DNA testing model for the common trisomies (for the chromosomes 21, 18 and 13) into the prenatal diagnostic screening programs in the Russian Federation. This novel model is based on the results of the mass combined first trimester prenatal screening in four federal subjects of the country completed by 2019 and is offered as an additional screening in the mid-level risk group (with cut-off from 1 : 100 to 1 : 500 or from 1 : 100 to 1 : 1000) defined according to the first trimester prenatal screening results. The basic requirements for the implementation of the contingent model in the Russian Federation are stated.

Non-Invasive Testing, Non-Invasive Counseling

2015 ◽  
Vol 43 (2) ◽  
pp. 228-240 ◽  
Author(s):  
Rachel Rebouché
Keyword(s):  
Chromosomal Abnormalities ◽  
Genetic Test ◽  
Prenatal Testing ◽  
Private Companies ◽  
Major Health ◽  
Prenatal Health ◽  
Non Invasive ◽  
Fetal Dna ◽  
Cell Free Fetal Dna ◽  
A Company

A regulatory moment for prenatal health care is here. An increasing amount of legislative attention has concentrated on the decisions pregnant women make after prenatal testing. The impetus for this legislation is a new non-invasive prenatal genetic test (NIPT). From the beginning of pregnancy, cell-free fetal DNA travels across the placental lining into the mother’s bloodstream, increasing in quantity as the pregnancy progresses. Laboratories can now analyze that DNA for chromosomal abnormalities and for fetal sex at 10 weeks of gestation. NIPT, which relies on a sample of the pregnant woman’s blood, is painless, occurs early in pregnancy, and is available for clinical and commercial use. In 2013, major health insurance plans began to cover NIPT for certain populations of women, such as women over 35 years old. And private companies have started marketing prenatal testing kits directly to consumers, who return a blood sample from the prospective mother to a company laboratory.

scholarly journals Non Invasive Prenatal Diagnosis of Aneuploidy: Next Generation Sequencing or Fetal DNA Enrichment?

2012 ◽  
Vol 15 (Supplement) ◽  
pp. 17-26 ◽  
Author(s):  
Neil D. Avent ◽  
A Webb ◽  
TE Madgett ◽  
T Miran ◽  
K Sillence ◽  
...  
Keyword(s):  
Prenatal Diagnosis ◽  
Detection Rate ◽  
Improve Patient Safety ◽  
Chorionic Villus ◽  
Diagnostic Procedures ◽  
Chorionic Villus Sampling ◽  
Group Status ◽  
Non Invasive ◽  
Fetal Dna ◽  
Cell Free Fetal Dna

ABSTRACT Current invasive procedures [amniocentesis and chorionic villus sampling (CVS)] pose a risk to mother and fetus and such diagnostic procedures are available only to high risk pregnancies limiting aneuploidy detection rate. This review seeks to highlight the necessity of investing in non invasive prenatal diagnosis (NIPD) and how NIPD would improve patient safety and detection rate as well as allowing detection earlier in pregnancy. Non invasive prenatal diagnosis can take either a proteomics approach or nucleic acid-based approach; this review focuses on the latter. Since the discovery of cell free fetal DNA (cffDNA) and fetal RNA in maternal plasma, procedures have been developed for detection for monogenic traits and for some have become well established (e.g., RHD blood group status). However, NIPD of aneuploidies remains technically challenging. This review examines currently published literature evaluating techniques and approaches that have been suggested and developed for aneuploidy detection, highlighting their advantages and limitations and areas for further research.

scholarly journals Optimal non‐invasive diagnosis of fetal achondroplasia combining ultrasonography with circulating cell‐free fetal DNA analysis

2018 ◽  
Vol 53 (1) ◽  
pp. 87-94 ◽  
Author(s):  
A. J. Vivanti ◽  
J.‐M. Costa ◽  
A. Rosefort ◽  
P. Kleinfinger ◽  
L. Lohmann ◽  
...  
Keyword(s):  
Dna Analysis ◽  
Non Invasive ◽  
Fetal Dna ◽  
Cell Free Fetal Dna
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