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Updated: Feb 2, 2026
Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
Published on: September 18, 2020
Micro-Inversions In Human Cancer Genomes
Abstract:
During the past few years, although scientists and researchers have studied variations in the cancer genomes, our current knowledge about the function of Micro-inversions (MIs) in cancer are still limited. MIs are generally defined as small inversions in DNA segments shorter than 100 bp. To expand our knowledge of their roles in cancer, we analyzed the MIs of 209 samples from four types of cancer, including hepatocellular carcinoma, lung cancer, pancreatic cancer, and bladder cancer. Within all the 209 samples, we identified 2,925 MIs, of which 1,519 (51.93%) are in gene regions. Of the 1,519 MIs in the gene regions, 106 (6.98%) are in the exon regions. We also analyzed 209 healthy samples as the control samples. We further analyzed the distribution of MIs in the four types of cancer among 24 chromosomes. Besides the chromosome preference, different cancers also have different preference for various genes. The MIs preference for different genes among four types of cancer may provide a guidance for the treatment and diagnosis on the four types of cancer. Medical doctors should concentrate more on chromosomes and the genes that MIs prefer to locate on. We also calculated the average count of MIs per individual among each cancer. From this result, we found that the bladder cancer has the most average count of MIs per individual, which means MIs may be more likely to exist in bladder cancer. According to our analysis, MIs play an important role in cancer and should be considered for further analysis.
Insights
Micro-inversions (MIs), small DNA segment inversions, are increasingly recognized for their role in cancer. This study analyzed MIs in four cancer types, revealing their prevalence and distribution across genes and chromosomes, suggesting diagnostic and therapeutic implications.
Area of Science:
- Genomics
- Cancer Biology
- Molecular Genetics
Background:
- Limited understanding of Micro-inversions (MIs) function in cancer genomes.
- MIs are defined as DNA segment inversions shorter than 100 base pairs.
- Cancer genome research has primarily focused on other types of variations.
Purpose of the Study:
- To investigate the role and distribution of Micro-inversions (MIs) in four major cancer types.
- To identify specific genes and chromosomes frequently affected by MIs in cancer.
- To explore the potential of MIs as biomarkers for cancer diagnosis and treatment.
Main Methods:
- Analysis of 2,925 Micro-inversions (MIs) across 209 samples from hepatocellular carcinoma, lung, pancreatic, and bladder cancers.
- Comparison with 209 healthy control samples.
- Detailed examination of MI distribution across 24 chromosomes and within gene regions, including exons.
Main Results:
- Over 51% of identified MIs were located within gene regions, with nearly 7% in exons.
- Significant variations in MI distribution were observed across different chromosomes and genes among the four cancer types.
- Bladder cancer exhibited the highest average count of MIs per individual, suggesting a potential link.
Conclusions:
- Micro-inversions (MIs) play a significant role in cancer development and progression.
- The specific distribution patterns of MIs across chromosomes and genes offer potential guidance for cancer diagnosis and treatment strategies.
- Further research into MIs is warranted to fully elucidate their impact on cancer and develop targeted therapies.
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