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Scientists Discover Strange 4-Stranded Genetic Structures in Human Blood : ScienceAlert (opens in a new tab)

sciencealert.com · 2026-09-15

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. 2 other points were not covered by the paper.

  • 2 supported
  • 1 overstated
  • 2 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
1
2

NewsLink checks it

Mixed

One claim overstates the study. Two of five check out. Two claims the study doesn't address.

  • 2 supported
  • 1 overstated
  • 2 not covered
Open claim evidence
3
Source paper

Source layer

The 4 papers the story cites

Source study separated from background citations.

The research anchor for the report.

Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedThe researchers used a gentle plasma-capture approach plus an antibody and a small molecule detector, and both produced signals that competed with each other, supporting that the material was folded G4 structure rather than random binding.View evidenceHide evidence

Why this verdict

The profile supports the use of a direct, extraction-/denaturation-/annealing-free plasma capture workflow, detection with two orthogonal probes, BG4 and NMM, and validation by competition with pyridostatin. However, the story’s wording that the two detector signals 'competed with each other' and that this showed the result was not random binding is stronger and less precise than the abstract-level evidence, which reports reciprocal competition with a third G4 ligand and does not provide detailed controls or quantitative specificity metrics.

1

Study evidence

Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.

“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
Claim 2 of 5Not coveredThe article says the experiment could not determine whether the detected G4s were made from DNA or RNA, and the tissues they came from are also unknown.View evidenceHide evidence

Why this verdict

The supplied abstract-level profile refers to 'endogenous nucleic acids' captured from plasma but does not state that the experiment could not distinguish DNA from RNA, nor does it state that the tissue source was unknown. These may be true from the full paper, but they are not verifiable from the provided abstract-depth profile.

1

Study evidence

Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.

“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
Claim 3 of 5Not coveredThe story suggests circulating G4s could someday provide cancer-related information, but says this is not a new cancer test and the study did not compare people with cancer against healthy participants.View evidenceHide evidence

Why this verdict

The profile shows basic biochemical/computational work using healthy-donor cfDNA analysis and pooled plasma capture, not a cancer diagnostic comparison, so the caution that this is not a cancer test is consistent with the profile. But the story’s suggestion that circulating G4s could someday provide cancer-related information is not supported or assessable from the supplied abstract-depth profile.

1

Study evidence

In silico size-selected US cfDNA from 20 healthy donors is selectively enriched at putative G-quadruplex–forming sequences that overlap experimentally observed quadruplex loci and accessible chromatin of blood cells.

“In silico size-selected US cfDNA from 20 healthy donors was selectively enriched at putative quadruplex sequences (PQS) that overlap both experimentally observed quadruplex sequences and accessible chromatin of blood cells.”
2

Study evidence

Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.

“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
Claim 4 of 5SupportedScientists say they have caught unusual four-stranded genetic structures folded in human blood plasma.View evidenceHide evidence

Why this verdict

The abstract-level profile supports the headline claim that folded G-quadruplex structures were detected in nucleic acids captured directly from human blood plasma. The headline phrasing is prominent, but it does not materially outrun the body as described; the main qualifier is that the paper profile describes pooled plasma and does not establish individual-level prevalence.

1

Study evidence

Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.

“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
Claim 5 of 5SupportedThe structures were identified as G-quadruplexes, or G4s, in genetic material captured directly from human plasma.View evidenceHide evidence

Why this verdict

The paper profile states that endogenous nucleic acids captured directly from pooled human plasma displayed folded G4 structures and that the authors interpret this as direct experimental evidence for folded G4 structures in human blood plasma. If the story’s wording is read as a priority claim about being the 'first,' that historical priority is not independently verifiable from the supplied abstract profile, but the core scientific claim is supported.

1

Study evidence

Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.

“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Computational enrichment analysis of ultrashort approximately 50-nt cfDNA from 20 healthy donors at putative G-quadruplex-forming sequences overlapping observed G4 loci and accessible chromatin in blood cells.

    This primary computational contribution is not represented in the presented story claims, which focus on the direct plasma-capture biochemical experiment.

    From in_silico_enrichment_analysis

  • Synthetic oligonucleotides corresponding to enriched plasma loci formed predominantly parallel G4 structures in vitro by circular dichroism spectroscopy.

    The story does not mention the separate in vitro biophysical validation using synthetic oligonucleotides and CD spectroscopy.

    From In vitro CD spectroscopy of synthetic oligonucleotides

  • The abstract profile does not provide quantitative signal metrics, replicate counts, or detailed control information for the plasma detection assays.

    The story describes the detection and competition results but does not convey the abstract-level limitation that quantitative assay strength and detailed controls are not available at this evidence depth.

    From Direct plasma capture and orthogonal probe detection

  • The capture workflow may influence which nucleic acids are recovered.

    The story notes a gentle capture approach but does not mention the profile’s caveat that the specific poly(A)-tailing and immobilization workflow may select or bias the recovered nucleic-acid population.

    From Direct plasma capture and orthogonal probe detection

3 things the story did carry across
  • Direct capture of endogenous nucleic acids from pooled human plasma without extraction, denaturation, or annealing, followed by detection of folded G4 structures.
  • Orthogonal detection with BG4 antibody and NMM, with specificity supported by pyridostatin competition.
  • The paper profile’s scope is basic research rather than a clinical cancer diagnostic study.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

3

Evidence read

study summary

Lead result

ex vivo human

1Lead resultex vivo humanEndogenous nucleic acids captured directly from pooled human plasma (without extraction/denaturation/annealing) contain folded G4 structures detectable by orthogonal probes and validated by competition.Direct plasma capture and orthogonal probe detectionExpand

In plain English

Endogenous nucleic acids captured directly from pooled human plasma by poly(A)-tailing and immobilization (no extraction/denaturation/annealing) displayed folded G-quadruplex (G4) structures. These folded G4s were detected using two orthogonal probes (BG4 antibody and the fluorogenic ligand N-methyl mesoporphyrin IX) and the signal was validated by reciprocal competition with the unrelated G4 ligand pyridostatin.

Key findings

  • Endogenous nucleic acids captured directly from pooled human plasma (via poly(A)-tailing and immobilization without extraction/denaturation/annealing) display folded G-quadruplex structures; these structures are detected by BG4 antibody and N-methyl mesoporphyrin IX and the signal is validated by reciprocal competition with pyridostatin.
“Endogenous nucleic acids captured directly from pooled plasma by poly(A)-tailing and immobilization, without extraction, denaturation or annealing at any step, displayed folded G4 structures.”
What this piece can’t prove
  • The abstract does not report quantitative measures (e.g., fraction of molecules showing G4, signal-to-noise, or replicate counts) for the plasma capture experiments.

2 further details could not be confirmed from the summary.

2in silicoUltrashort (∼50-nt) single-stranded cfDNA in human plasma is selectively enriched at putative G-quadruplex–forming sequences that overlap experimentally observed quadruplex loci and accessible chromatin in blood cells.in silico enrichment analysisExpand

In plain English

In silico size selection of ultrashort (~50-nt) cfDNA from 20 healthy donors showed selective enrichment at putative G-quadruplex–forming sequences (PQS) that overlap both experimentally observed G4 loci and blood-cell accessible chromatin annotations.

Key findings

  • In silico size-selected US cfDNA from 20 healthy donors is selectively enriched at putative G-quadruplex–forming sequences that overlap experimentally observed quadruplex loci and accessible chromatin of blood cells.
“In silico size-selected US cfDNA from 20 healthy donors was selectively enriched at putative quadruplex sequences (PQS) that overlap both experimentally observed quadruplex sequences and accessible chromatin of blood cells.”
What this piece can’t prove
  • Analysis is in silico and relies on sequence-based PQS definitions and external datasets for experimentally observed G4 loci and chromatin accessibility.
  • Enrichment/overlap does not by itself confirm that the enriched cfDNA fragments are folded into G4 structures in plasma (biochemical/biophysical assays are described elsewhere in the paper).

1 further detail could not be confirmed from the summary.

3in vitroSynthetic oligonucleotides from the most enriched plasma loci form predominantly parallel G-quadruplex (G4) structures in vitro (biophysical validation).In vitro CD spectroscopy of synthetic oligonucleotidesExpand

In plain English

In vitro circular dichroism (CD) spectroscopy on synthetic oligonucleotides corresponding to loci most enriched in size-selected ultrashort cfDNA showed these sequences adopt predominantly parallel G-quadruplex (G4) structures.

Key findings

  • Synthetic oligonucleotides corresponding to the most enriched plasma loci adopted predominantly parallel G-quadruplex (G4) structures, as revealed by circular dichroism.
“Synthetic oligonucleotides corresponding to the most enriched of these loci adopted predominantly parallel G-quadruplex (G4) structures, as revealed by circular dichroism.”
What this piece can’t prove
  • Use of synthetic oligonucleotides may not capture effects of plasma milieu, nucleic acid modifications, or protein interactions present in vivo.

1 further detail could not be confirmed from the summary.

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Method layer

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 18 candidate papers

Candidate

Biology and Diagnostic Applications of Cell-Free Fetal Nucleic Acids in Maternal Plasma

Nucleic Acids and Molecular Biology · 2010 · Crossref

Source (opens in a new tab)

And 12 more candidates considered.