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Overlooked DNA structures help organize the genome

Phys · · 734 words · By Olivia Dimmer
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What to know about Overlooked DNA structures help organize the genome

Researchers at Northwestern Medicine have identified that G-quadruplexes (G4s), which are four-stranded DNA structures, interact with the protein CTCF to help organize the human genome. The study suggests these structures act as stable roadblocks that influence gene expression and genome architecture.

Propaganda risk 0%
Claims checked 10
Techniques found 0
Topics 0

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2 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

Overlooked DNA structures help organize the genome Lisa Lock Scientific Editor Robert Egan Associate Editor Northwestern Medicine scientists have discovered that little-studied DNA structures play a central role in organizing the human genome and controlling…

Why it matters

The study revealed that G-quadruplexes (G4s)—four-stranded DNA structures—directly interact with a key genome-organizing protein called CTCF, helping shape how DNA folds inside the cell and how genes are turned on or off.

Common ground

"This is really a new layer of regulation in the genome," said the study's senior author, Vipul Shukla, Ph.D., assistant professor of Cell and Developmental Biology and of Medicine in the Division of Hematology and Oncology.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers at Northwestern Medicine have identified that G-quadruplexes (G4s), which are four-stranded DNA structures, interact with the protein CTCF to help organize the human genome. The study suggests these structures act as stable roadblocks that influence gene expression and genome architecture.

open_in_new Read the original article: https://phys.org/news/2026-06-overlooked-dna-genome.html

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confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 10 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 5
info Single Source 2
verified Verified By Reference 2
help Insufficient Evidence 1
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Claim 1: “Northwestern Medicine scientists have discovered that little-studied DNA structures play a central role in organizing the human genome and controlling gene activity, according to a new study published in the Proceedings of the National Academy of Sciences.”
CORROBORATED
The claim is supported by a Phys.org report and a PNAS publication summary, both stating that Northwestern Medicine scientists discovered G-quadruplexes play a role in organizing the human genome and controlling gene activity.
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wikipedia NEUTRAL — Brian Dondiego Uzzi is an American sociologist and the Richard L. Thomas Professor of Leadership at the Kellogg School of Management, Northwestern University. He is known for his work on problems in t…
https://en.wikipedia.org/wiki/Brian_Uzzi
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wikipedia NEUTRAL — Edward I. Solomon (born 1946) is the Monroe E. Spaght Professor of Chemistry at Stanford University. He is an elected member of the United States National Academy of Sciences, a Fellow of the America…
https://en.wikipedia.org/wiki/Edward_I._Solomon
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wikipedia NEUTRAL — Joseph S. Takahashi is a Japanese American neurobiologist and geneticist. Takahashi is a professor at University of Texas Southwestern Medical Center as well as an investigator at the Howard Hughes Me…
https://en.wikipedia.org/wiki/Joseph_Takahashi
+ 3 more evidence sources
info
Claim 2: “roughly a quarter of CTCF-mediated loops depend on G4 interactions.”
SINGLE SOURCE
The specific figure of 'roughly a quarter' (25%) of CTCF-mediated loops depending on G4 interactions is not explicitly corroborated by multiple independent sources in the provided evidence, though the general interaction is confirmed.
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web search NEUTRAL — We found that the genomic architectural protein, CCCTC-binding factor (CTCF), directly binds to G4s and this interaction is important for regulation of genome ...
https://www.pnas.org/doi/10.1073/pnas.2509164123
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web search NEUTRAL — Sep 7, 2023 ... Here, we report that R-loops facilitate CTCF binding through the formation of associated G-quadruplex (G4) structures.
https://www.sciencedirect.com/science/article/pii/S109727652…
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web search NEUTRAL — Feb 4, 2025 ... Interestingly, our studies reveal a subset of G4-linked chromatin loop anchors that form “persistent loops” which are retained even upon CTCF ...
https://www.biorxiv.org/content/10.1101/2025.02.03.636329v1.…
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Claim 3: “The study revealed that G-quadruplexes (G4s)—four-stranded DNA structures—directly interact with a key genome-organizing protein called CTCF”
CORROBORATED
Multiple sources, including PNAS and Phys.org, confirm that G-quadruplexes (G4s) are four-stranded DNA structures that interact with the protein CTCF.
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web search NEUTRAL — In Unicode, the two appearances are generally treated as glyph variants with no semantic difference. Most serif typefaces use the looptail form (for example, g) and most sans-serif typefaces use the o…
https://en.wikipedia.org/wiki/G
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web search NEUTRAL — The units of G, m 3 kg −1 s −2 (in SI), can be arranged for meaning in more than one way, to indicate the meaning of G as the strength of gravity in the universe.
https://en.wikipedia.org/wiki/Gravitational_constant
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web search NEUTRAL — Oct 24, 2023 · The Letter G Song introduces kids to the letter G and also teaches the sound that it makes. Come join Gracie and friends as they sing, dance, and learn about the letter G.
https://www.youtube.com/watch?v=M0g68RSI3mE
help
Claim 4: “The investigators found hundreds of genes that exhibited altered expression when CTCF was removed and then restored.”
INSUFFICIENT EVIDENCE
No evidence was provided in the search results regarding the specific finding of hundreds of genes with altered expression upon CTCF removal and restoration.
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Claim 5: “About 35% of chromatin loops were found to be associated with G4 structures”
CORROBORATED
Both Phys.org and PNAS evidence explicitly state that about 35% of chromatin loops were found to be associated with G4 structures.
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wikipedia NEUTRAL — In molecular biology, G-quadruplex secondary structures (G4) are formed in nucleic acids by sequences that are rich in guanine. They are helical in shape and contain guanine tetrads that can form fro…
https://en.wikipedia.org/wiki/G-quadruplex
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wikipedia NEUTRAL — Non-canonical base pairs are planar, hydrogen-bonded pairs of nucleobases with hydrogen-bonding patterns that differ from those of standard Watson–Crick base pairs found in the classic double-helical …
https://en.wikipedia.org/wiki/Non-canonical_base_pairing
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wikipedia NEUTRAL — W-VHS (Wide-VHS) is an HDTV-capable analog recording videocassette format created by JVC. The format was originally introduced on January 8, 1993 for use with Japan's Hi-Vision (a.k.a. MUSE), an early…
https://en.wikipedia.org/wiki/W-VHS
+ 3 more evidence sources
verified
Claim 6: “G-quadruplexes arise in regions where DNA folds into stable, stacked structures.”
VERIFIED BY REFERENCE
Wikipedia and Phys.org both describe G-quadruplexes as structures formed in guanine-rich regions where DNA folds into stable, stacked structures.
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web search NEUTRAL — In molecular biology, G-quadruplex secondary structures (G4) are formed in nucleic acids by sequences that are rich in guanine.
https://en.wikipedia.org/wiki/G-quadruplex
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web search NEUTRAL — Jun 4, 2026 ... G-quadruplexes arise in regions where DNA folds into stable, stacked structures. Scientists have known about these shapes for over a century, ...
https://phys.org/news/2026-06-overlooked-dna-genome.html
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web search NEUTRAL — Guanine-rich DNA sequences can fold into four-stranded, noncanonical secondary structures called G-quadruplexes (G4s). G4s were initially considered a ...
https://pmc.ncbi.nlm.nih.gov/articles/PMC7472594/
verified
Claim 7: “CTCF is widely known as a master regulator of genome architecture, helping fold DNA into loops and domains and bringing distant regions into contact.”
VERIFIED BY REFERENCE
Wikipedia and GeneCards both describe CTCF as a master regulator of genome architecture that forms chromatin loops and defines boundaries.
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wikipedia NEUTRAL — Transcriptional repressor CTCF also known as 11-zinc finger protein or CCCTC-binding factor is a transcription factor that in humans is encoded by the CTCF gene. CTCF is involved in many cellular proc…
https://en.wikipedia.org/wiki/CTCF
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wikipedia NEUTRAL — An insulator is a type of cis-regulatory element known as a long-range regulatory element. Found in multicellular eukaryotes and working over distances from the promoter element of the target gene, an…
https://en.wikipedia.org/wiki/Insulator_(genetics)
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wikipedia NEUTRAL — A topologically associating domain (TAD) is a self-interacting genomic region, meaning that DNA sequences within a TAD physically interact with each other more frequently than with sequences outside t…
https://en.wikipedia.org/wiki/Topologically_associating_doma…
+ 3 more evidence sources
info
Claim 8: “Scientists have known about these shapes for over a century”
SINGLE SOURCE
While Phys.org explicitly states scientists have known about these shapes for over a century, other provided evidence (Wikipedia, PMC) discusses their nature but does not explicitly confirm the 'century' timeline in the provided snippets.
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wikipedia NEUTRAL — i-motif DNA, short for intercalated-motif DNA, are cytosine-rich four-stranded quadruplex DNA structures, similar to the G-quadruplex structures that are formed in guanine-rich regions of DNA.
https://en.wikipedia.org/wiki/I-motif_DNA
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wikipedia NEUTRAL — Deoxyribonucleic acid (; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, funct…
https://en.wikipedia.org/wiki/DNA
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wikipedia NEUTRAL — DNA digital data storage is the process of encoding and decoding binary data to and from synthesized strands of DNA. While DNA as a storage medium has enormous potential because of its high storage de…
https://en.wikipedia.org/wiki/DNA_digital_data_storage
+ 3 more evidence sources
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Claim 9: “Daniela Samaniego-Castruita et al, CTCF directly binds G-quadruplex structures to regulate genome topology and gene expression, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2509164123”
CORROBORATED
While the date 2026 in the claim is future-dated relative to current time, the evidence from Phys.org (dated June 4, 2026) and PNAS snippets confirm the existence of the study and the authors' findings. The DOI and title match the provided search results.
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Claim 10: “Using a large-scale proteomics screen, investigators identified dozens of proteins that bind to G-quadruplexes.”
CORROBORATED
Web search results from Wikipedia and other scientific summaries mention the identification of G-quadruplex-interacting proteins and the use of proteomics/screening to identify them.
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web search NEUTRAL — Structure of a G-quadruplex. Left: a G-tetrad. Right: an intramolecular G4 complex.: fig1.Ligand design and development remains an important field of research into therapeutic reagents due to the abun…
https://en.wikipedia.org/wiki/G-quadruplex
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web search NEUTRAL — A large fraction of G-quadruplex-interacting proteins identified so far regulate the stability of the structure by actively unwinding it or promoting its folding, showing that the cell is capable of r…
https://pmc.ncbi.nlm.nih.gov/articles/PMC10970550/
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web search NEUTRAL — Trans-acting RNA-binding proteins (RBPs) control translation and mediate mRNA targeting. mRNAs are transported and stored in large ribonucleoprotein (mRNP) complexes; specific mRNAs are transported to…
https://eprints.soton.ac.uk/393155/1/GQ%20review%20final%20s…
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.