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piRNA - Piwi-interacting RNAs02:57

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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Transcriptome‑wide piRNA profiling in human gastric cancer.

Xiandong Lin1, Yan Xia2, Dan Hu2

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Piwi-interacting RNAs (piRNAs) are abundant in human stomachs and may be linked to gastric cancer development. This study identified specific piRNAs differentially expressed in tumors, suggesting their potential role in the disease etiology.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Oncology

Background:

  • Piwi-interacting RNAs (piRNAs) are a major class of non-coding RNAs found in biological systems with renewal capacity.
  • While piRNAs exist in animal stomachs, their role in human gastric cancer is not well understood.

Purpose of the Study:

  • To identify piRNAs associated with human gastric cancers across the entire transcriptome.
  • To investigate the relationship between piRNA expression, transposable elements, gene regulation, and genetic variants in gastric cancer.

Main Methods:

  • Analysis of piRNA expression in fresh human stomach tumor and adjacent non-tumorous tissues using a piRNA microarray.
  • Validation of differentially expressed piRNAs by quantitative PCR (qPCR).
  • Investigation of transposable element targets, complementary gene expression, and the impact of cancer-risk SNPs on piRNA expression.

Main Results:

  • Identification of 8,759 piRNAs in human stomachs.
  • 50 piRNAs showed significant differential expression (>2-fold change, P<0.05) between gastric cancer tissues and controls.
  • A significant portion of genes potentially regulated by these piRNAs were expressed in the stomach, and piRNA expression correlated with cancer-risk SNPs.

Conclusions:

  • PiRNAs are prevalent in the human stomach.
  • Differentially expressed piRNAs are associated with gastric cancer.
  • PiRNAs may play a crucial role in the development and etiology of human gastric cancers.