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A 2020 paper proposed that bacteria use a newly identified RNA family, called Sensei, to sense iron. That claim is not an established discovery: the journal retracted the paper in June 2021 over concerns about data integrity and reproducibility, and a later review says Sensei RNA was not an iron-responsive riboswitch.
What the 2020 report claimed
The original paper, published online on 5 October 2020, was titled “Discovery of iron-sensing bacterial riboswitches.” It proposed a bacterial RNA family named Sensei, short for “Sense iron.” According to the historical claim, Sensei RNA bound Fe(II), the reduced form of iron, and changed its structure in a way that affected production of a downstream protein. The National Centre for Biological Sciences record preserves the original abstract’s claim; it should be read alongside the later retraction notice.
![Bacterial_Research_Chemostat_DNA_RNA_ 1991 [Leather Bound]](https://m.media-amazon.com/images/I/31gqE8kgIYL._SL160_.jpg)
A riboswitch is an RNA sequence that can respond to a molecule and influence gene expression. In the proposed Sensei mechanism, iron binding was supposed to alter RNA structure and thereby regulate translation. Chemistry World’s report from 27 October 2020 summarized this proposed mechanism at the time. These are descriptions of what the retracted study asserted, not verified findings.
Why the paper was retracted
Nature Chemical Biology’s notice records that the authors retracted the paper on 29 June 2021, citing issues with data integrity and reproducibility. The notice identified similarities in native-gel backgrounds, possible duplication of western-blot bands, and inconsistent spacing in isothermal titration calorimetry (ITC) curves. It also said the authors no longer had access to raw data needed to verify salt-dependent binding affinities.
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In the notice, the authors wrote: “Given that the key data supporting the iron ion-induced structural changes in Sensei RNAs—a central conclusion of the original paper—are now called into question, we believe that retraction of the work in its entirety is essential.” The full journal retraction notice explains the concerns and formally marks the article as retracted.
What later evidence says about Sensei
A 2022 review of iron-responsive riboswitches describes the Sensei findings as coming from a retracted article. It reports that work using a Sensei-based fluorescent biosensor, along with ITC studies, showed Sensei RNA was not in fact an iron-responsive riboswitch. The review therefore presents the proposed iron response as challenged, rather than as an unresolved candidate discovery. See “Iron-responsive riboswitches” (2022).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the headline means now
“Entirely new way of sensing iron discovered in bacteria” was the wording of the 2020 news headline, reflecting the paper’s original claim. It should not be read as a confirmed current result. The accurate account is that researchers reported a possible RNA-based iron sensor, the paper was retracted in 2021 over concerns affecting key evidence, and a later review says Sensei RNA was not an iron-responsive riboswitch.
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