Evidence map›Paper›PMID 32533152›Full record

ArticleClinical chemistry2020

Noninvasive Fetal Genotyping by Droplet Digital PCR to Identify Maternally Inherited Monogenic Diabetes Variants.

Richard C Caswell, Tristan Snowsill, Jayne A L Houghton, Ali J Chakera, Maggie H Shepherd, Thomas W Laver, Bridget A Knight, David Wright, Andrew T Hattersley, Sian Ellard

Open access · hybridAbstract read
In one paragraph

Article in Clinical chemistry, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.

0numbers the graph read from it
0cells of the map it votes in
23citing papers in PubMed
10.5field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

23 citing papers in PubMed, 45 citations in OpenAlex.

  1. Article
  2. Review
  3. Observational
  4. Article
  5. Observational
  6. Article
  7. Article
  8. Review
  9. Article
  10. Non-invasive prenatal diagnosis (NIPD): current and emerging technologies.Extracellular vesicles and circulating nucleic acids · 2023
    Review
  11. Article
  12. Article
  13. Review
  14. Review
  15. Article
  16. Article
  17. Sequencing Cell-free Fetal DNA in Pregnant Women With GCK-MODY.The Journal of clinical endocrinology and metabolism · 2021
    Article
  18. Article
  19. Article
  20. Review
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 3 institutions in 1 country.

Richard C CaswellInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Tristan SnowsillInstitute of Health Research, University of Exeter Medical School, Exeter, UK.
Jayne A L HoughtonInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Ali J ChakeraInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Maggie H ShepherdInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Thomas W LaverInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Bridget A KnightInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
David WrightInstitute of Health Research, University of Exeter Medical School, Knowledge Spa, Royal Cornwall Hospital, Truro, UK.
Andrew T HattersleyInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
Sian EllardInstitute of Biomedical and Clinical Science, University of Exeter Medical School, Exeter, UK.
University of Exeter · GBGenomics (United Kingdom) · GBRoyal Devon & Exeter NHS Foundation Trust · GB

Funding

Wellcome Trust 098395
6 · The paper itself

Abstract

backgroundBabies of women with heterozygous pathogenic glucokinase (GCK) variants causing mild fasting hyperglycemia are at risk of macrosomia if they do not inherit the variant. Conversely, babies who inherit a pathogenic hepatocyte nuclear factor 4α (HNF4A) diabetes variant are at increased risk of high birth weight. Noninvasive fetal genotyping for maternal pathogenic variants would inform pregnancy management.

methodsDroplet digital PCR was used to quantify reference and variant alleles in cell-free DNA extracted from blood from 38 pregnant women heterozygous for a GCK or HNF4A variant and to determine fetal fraction by measurement of informative maternal and paternal variants. Droplet numbers positive for the reference/alternate allele together with the fetal fraction were used in a Bayesian analysis to derive probability for the fetal genotype. The babies' genotypes were ascertained postnatally by Sanger sequencing.

resultsDroplet digital PCR assays for GCK or HNF4A variants were validated for testing in all 38 pregnancies. Fetal fraction of ≥2% was demonstrated in at least 1 cell-free DNA sample from 33 pregnancies. A threshold of ≥0.95 for calling homozygous reference genotypes and ≤0.05 for heterozygous fetal genotypes allowed correct genotype calls for all 33 pregnancies with no false-positive results. In 30 of 33 pregnancies, a result was obtained from a single blood sample.

conclusionsThis assay can be used to identify pregnancies at risk of macrosomia due to maternal monogenic diabetes variants.

Indexed as

Maternal InheritanceBiomarkersDiabetes MellitusDNAFemaleFetal MacrosomiaFetusGenotypeGenotyping TechniquesGlucokinaseHepatocyte Nuclear Factor 4HumansMaleMarkov ChainsMonte Carlo MethodPolymerase Chain ReactionBiomarkersDNAGlucokinaseHepatocyte Nuclear Factor 4HNF4A protein, humanBayesian analysisdroplet digital PCRmonogenic diabetesnon-invasive prenatal diagnosis

Identifiers

PMID32533152
PMCPMC7611030
OpenAlexW3033686038

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.