Evidence map›Paper›PMID 42056317›Full record

ArticleScientific reports2026

Genome-based analysis of Bacillus velezensis Bm3 isolated from a vulnerable dioxin-contaminated site in central Syria reveals mechanisms of dioxin degradation.

Sabrin Mahfouz, Sylvie Nazaret, Agnès Richaume, Abdulsamie Hanano

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Article in Scientific reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

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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

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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

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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

4 authors.

Sabrin MahfouzDepartment of Plant Biology, Faculty of Sciences, University of Damascus, Damascus, Syria.
Sylvie NazaretLaboratoire d'Ecologie Microbienne, UMR CNRS 5557, UMR INRAE 1418, Université Claude Bernard Lyon 1, VetAgro Sup, 69622, Villeurbanne, France.
Agnès RichaumeLaboratoire d'Ecologie Microbienne, UMR CNRS 5557, UMR INRAE 1418, Université Claude Bernard Lyon 1, VetAgro Sup, 69622, Villeurbanne, France.
Abdulsamie HananoDivision of Biochemistry and Toxicology, Department of Molecular Biology and Biotechnology, Atomic Energy Commission of Syria (AECS), P.O. Box 6091, Damascus, Syria. ashanano@aec.org.sy.ORCID http://orcid.org/0000-0002-1699-106X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Dioxin contamination represents a serious global environmental threat, particularly in developing and climate-vulnerable regions. This study evaluates the potential of Bacillus velezensis Bm3, isolated from a dioxin-contaminated site in central Syria, for the aerobic biodegradation of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD). Quantitative analyses demonstrated a strong biodegradative capacity, with 71% and 76% of the initial TCDD concentration removed after 5 and 6 weeks, respectively. Whole-genome sequencing revealed a 5.29 Mbp genome encoding 5411 predicted proteins, providing a solid genetic basis for this activity. A two-step degradation pathway is proposed, initiated by cytochrome P450-mediated hydroxylation of TCDD to dihydroxy-hydrodibenzo-p-dioxin, followed by conversion to the key intermediate catechol. This compound is subsequently cleaved by catechol 2,3-dioxygenase, yielding acetaldehyde and pyruvate. Gene expression and protein accumulation analyses supported this mechanism, showing strong induction of a specific cytochrome P450 isoform (CYPBM3_v1_ua3131) and cat-2,3-diox transcripts. These findings identify B. velezensis Bm3 as a promising candidate for TCDD bioremediation in warm, dry environments.

Indexed as

BacillusDioxinsGenome, BacterialPolychlorinated DibenzodioxinsBacterial ProteinsBiodegradation, EnvironmentalCytochrome P-450 Enzyme SystemSyriaWhole Genome SequencingBacterial ProteinsCytochrome P-450 Enzyme SystemDioxinsPolychlorinated DibenzodioxinsBacillus velezensis Bm3BiodegradationDioxinTCDDWhole genome

Identifiers

PMID42056317
PMCPMC13316093

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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.