Integrative Metatranscriptomic Analysis Reveals Disease-specific Microbiome–host Interactions in Oral Squamous Cell Carcinoma

Vinay Jain, Divyashri Baraniya, Doaa E. El-Hadedy, Tsute Chen, Michael Slifker, Fadhl Alakwaa, Kathy Q. Cai, Kumaraswamy N. Chitrala, Christopher Fundakowski, Nezar N. Al-Hebshi

Research output: Contribution to journalArticlepeer-review

Abstract

Studies on the microbiome of oral squamous cell carcinoma (OSCC) have been limited to 16S rRNA gene sequencing. Here, laser microdissection coupled with brute-force, deep metatranscriptome sequencing was employed to simultaneously characterize the microbiome and host transcriptomes and predict their interaction in OSCC. The analysis involved 20 HPV16/18-negative OSCC tumor/adjacent normal tissue pairs (TT and ANT) along with deep tongue scrapings from 20 matched healthy controls (HC). Standard bioinformatic tools coupled with in-house algorithms were used to map, analyze, and integrate microbial and host data. Host transcriptome analysis identified enrichment of known cancer-related gene sets, not only in TT versus ANT and HC, but also in the ANT versus HC contrast, consistent with field cancerization. Microbial analysis identified a low abundance yet transcriptionally active, unique multi-kingdom microbiome in OSCC tissues predominated by bacteria and bacteriophages. HC showed a different taxonomic profile yet shared major microbial enzyme classes and pathways with TT/ANT, consistent with functional redundancy. Key taxa enriched in TT/ANT compared with HC were Cutibacterium acnes, Malassezia restricta, Human Herpes Virus 6B, and bacteriophage Yuavirus. Functionally, hyaluronate lyase was overexpressed by C. acnes in TT/ANT. Microbiome-host data integration revealed that OSCC-enriched taxa were associated with upregulation of proliferation-related pathways. In a preliminary in vitro validation experiment, infection of SCC25 oral cancer cells with C. acnes resulted in upregulation of MYC expression. The study provides a new insight into potential mechanisms by which the microbiome can contribute to oral carcinogenesis, which can be validated in future experimental studies.Studies have shown that a distinct microbiome is associated with OSCC, but how the microbiome functions within the tumor interacts with the host cells remains unclear. By simultaneously characterizing the microbial and host transcriptomes in OSCC and control tissues, the study provides novel insights into microbiome-host interactions in OSCC which can be validated in future mechanistic studies.
Original languageAmerican English
Pages (from-to)807-820
Number of pages14
JournalCancer Res Commun
Volume3
Issue number5
DOIs
StatePublished - 2023

Keywords

  • Carcinoma, Squamous Cell/genetics
  • Head and Neck Neoplasms
  • Human papillomavirus 16/genetics
  • Human papillomavirus 18/genetics
  • Humans
  • Microbiota/genetics
  • Mouth Neoplasms/genetics
  • RNA, Ribosomal, 16S/genetics
  • Squamous Cell Carcinoma of Head and Neck/genetics

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