IDDF2023-ABS-0237 Characteristics of helicobacter pylori from mongolia where burdening high incidence of gastric cancer
Bibliographic record
Abstract
Background Globally Mongolia is the top country in the incidence of gastric cancer followed by Japan and Korea which are East Asian countries. Helicobacter pylori (H. pylori) infection possessing East-Asian-type CagA is more associated with gastric carcinogenesis than Western-type CagA. The prevalence of H. pylori is around 70% in Mongolia; however, the previous study reported Mongolians infected with H. pylori possessing Western-type CagA. Therefore, we aimed to characterize Mongolian H. pylori infection based on a whole genome sequencing method. Methods Totally 130 strains are sequenced from Mongolian H. pylori isolates (20 gastric cancer and 110 non-cancer cases) and 401 data from 38 countries H. pylori whole genome data were extracted for the FineStructure analysis. The complete CagA gene and 7 housekeeping genes were extracted for constructing a phylogenetic tree. Results Based on whole genomic FineStructure analysis we found new H. pylori population named as HpMongolia among Mongolian gastric cancer and non-gastric cancer cases which are separately clustered among published global H. pylori populations (IDDF2023-ABS-0237-Figure 1. FineStructure analysis for H.pylori population). Complete CagA gene sequencing data showed that HpMongolia possessed with J-Western type cagA and it was the highest distribution of J-Western cagA positive H. pylori strains identified in Mongolia (67.7%) followed by Canada, North America (10%), and Okinawa, Japan (5.9%) among the published population (IDDF2023-ABS-0237-Figure 2. Global H.pylori phylogenetic tree based on 7-housekeeping genes). The phylogenetic tree constructed based on 7 housekeeping genes result showed the closest H. pylori population with HpMongolia is the HpAmerind which is isolated from native American people (IDDF2023-ABS-0237-Figure 3. H.pylori CagA genotyping map). Conclusions Mongolians provide new H. pylori population is named as HpMongolia which contains most of the cases Japanese-Western type cagA both for cancer and non-cancer cases. Therefore Japanese-Western type cagA might have advantageous for human migration study markers and further clinical implications.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".