Show Notes
Lamkina EN et al., PNAS - This episode reviews a PNAS brief report showing that DENV-4 infection induces marked DNA damage in infected cells while broadly suppressing transcription of DNA repair pathways, with selective upregulation of a mutagenic translesion polymerase and suppressed ATR expression. The findings raise concerns about long-term molecular "scars" after dengue infection that could influence cancer and postdengue syndromes. Key terms: Dengue, DENV-4, DNA damage, DNA repair, Genome instability.
Study Highlights:
Using Vero E6 and HUH-7 cells infected at MOI 0.1 and followed up to 5 days, the authors detected a large increase in γH2AX signaling indicating DNA damage. A 96-gene qPCR panel showed widespread suppression of DNA repair and DDR transcripts across multiple pathways while mismatch repair proteins remained stable. ATR protein expression was reduced and the mutagenic polymerase POLι was upregulated, telomere length and TRF2 were unchanged, and LC3 I/II levels decreased. The authors propose these changes create durable molecular vulnerabilities that warrant patient-based validation.
Conclusion:
DENV-4 causes significant host DNA damage while repressing many DNA repair transcripts, a combination that may leave lasting molecular scars and elevate long-term disease risk, but confirmation in patient samples is needed.
Music:
Enjoy the music based on this article at the end of the episode.
Article title:
DENV-4 infection suppresses transcription of DNA repair genes
First author:
Lamkina EN
Journal:
PNAS
DOI:
10.1073/pnas.2536909123
Reference:
Lamkina EN, Reich J, Victora JA, et al. DENV-4 infection suppresses transcription of DNA repair genes. PNAS. 2026;123(32):e2536909123. doi:10.1073/pnas.2536909123
License:
This episode is based on an open-access article published under the Creative Commons Attribution 4.0 International License (CC BY 4.0) – https://creativecommons.org/licenses/by/4.0/
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Episode link: https://basebybase.com/episodes/base-by-base-denv4-dna-repair
QC:
This episode was checked against the original article PDF and publication metadata for the episode release published on 2026-08-12.
QC Scope:
- article metadata and core scientific claims from the narration
- excludes analogies, intro/outro, and music
- transcript coverage: Audited the main scientific narrative: DENV-4 infection at MOI 0.1 in Vero E6 and HUH-7 cells; γH2AX DNA damage; broad suppression of DDR/DNA repair transcription with selective maintenance of MMR; ATR suppression; telomere length/TRF2 status; autophagy marker LC3 I/II; POLι upregulation; serotype-specific contrasts; a
- transcript topics: DENV-4 infection setup in vitro (MOI 0.1, 5 days, Vero E6 and HUH-7); γH2AX DNA damage signaling in infected cells; Broad suppression of DDR/DNA repair transcripts (BER, HR, NHEJ, NER) with MMR largely unchanged; ATR suppression and its consequence for DNA repair coordination; Telomere length and TRF2 status in infected cells; Maintenance of MMR proteins (MLH1, MSH2, MSH6) despite widespread suppression
QC Summary:
- factual score: 10/10
- metadata score: 10/10
- supported core claims: 6
- claims flagged for review: 0
- metadata checks passed: 4
- metadata issues found: 0
Metadata Audited:
- article_doi
- article_title
- article_journal
- license
Factual Items Audited:
- γH2AX increased up to 24-fold by 5 days post infection in surviving cells
- Broad suppression of DDR/DNA repair transcripts across BER, HR, NHEJ, NER with MMR largely unchanged
- ATR protein expression suppressed by day 5
- Telomere length unchanged and TRF2 protein expression unchanged
- MMR proteins MLH1, MSH2, MSH6 unchanged
- POLι upregulated (mutagenic translesion synthesis polymerase)
QC result: Pass.
