Evidence map›Paper›PMID 25886572›Full record

ArticleGenome biology2015

Whole genome bisulfite sequencing of cell-free DNA and its cellular contributors uncovers placenta hypomethylated domains.

Taylor J Jensen, Sung K Kim, Zhanyang Zhu, Christine Chin, Claudia Gebhard, Tim Lu, Cosmin Deciu, Dirk van den Boom, Mathias Ehrich

Open access · hybridAbstract read
In one paragraph

Article in Genome biology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 45 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
45citing papers in PubMed, 1 pooled it
1.8field-weighted citation impact, top 15% 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

45 citing papers in PubMed, 1 synthesis or guideline pooled it, 73 citations in OpenAlex.

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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

9 authors at 1 institution in 1 country.

Taylor J JensenSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. tjensen@sequenom.com.
Sung K KimSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. skim@scmmlab.com.
Zhanyang ZhuSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. zzhu@scmmlab.com.
Christine ChinSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. cchin@scmmlab.com.
Claudia GebhardSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. claudia.gebhard@googlemail.com.
Tim LuSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. tlu@scmmlab.com.
Cosmin DeciuSequenom Laboratories, 3595 John Hopkins Ct, San Diego, CA, 92121, USA. cdeciu@scmmlab.com.
Dirk van den BoomSequenom Inc., 3595 John Hopkins Ct, San Diego, CA, 92121, USA. dvandenboom@sequenom.com.
Mathias EhrichSequenom Inc., 3595 John Hopkins Ct, San Diego, CA, 92121, USA. mehrich@sequenom.com.
Sequenom (United States) · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCirculating cell-free fetal DNA has enabled non-invasive prenatal fetal aneuploidy testing without direct discrimination of the maternal and fetal DNA. Testing may be improved by specifically enriching the sample material for fetal DNA. DNA methylation may allow for such a separation of DNA; however, this depends on knowledge of the methylomes of circulating cell-free DNA and its cellular contributors.

resultsWe perform whole genome bisulfite sequencing on a set of unmatched samples including circulating cell-free DNA from non-pregnant and pregnant female donors and genomic DNA from maternal buffy coat and placenta samples. We find CpG cytosines within longer fragments are more likely to be methylated. Comparison of the methylomes of placenta and non-pregnant circulating cell-free DNA reveal many of the 51,259 identified differentially methylated regions are located in domains exhibiting consistent placenta hypomethylation across millions of consecutive bases. We find these placenta hypomethylated domains are consistently located within regions exhibiting low CpG and gene density. Differentially methylated regions identified when comparing placenta to non-pregnant circulating cell-free DNA are recapitulated in pregnant circulating cell-free DNA, confirming the ability to detect differential methylation in circulating cell-free DNA mixtures.

conclusionsWe generate methylome maps for four sample types at single-base resolution, identify a link between DNA methylation and fragment length in circulating cell-free DNA, identify differentially methylated regions between sample groups, and uncover the presence of megabase-size placenta hypomethylated domains.

Indexed as

Sequence Analysis, DNACpG IslandsCytosineDNADNA FragmentationDNA MethylationEpigenesis, GeneticFemaleFetusGene LibraryGenomicsHumansImmunoprecipitationPlacentaPregnancySulfitesCytosineDNAhydrogen sulfiteSulfites

Identifiers

PMID25886572
PMCPMC4427941
OpenAlexW2057401572

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

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.