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An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues
10:41

An Integrated Platform for Genome-wide Mapping of Chromatin States Using High-throughput ChIP-sequencing in Tumor Tissues

Published on: April 5, 2018

Somatic mutations in the chromatin remodeling gene ARID1A occur in several tumor types

Siân Jones1, Meng Li, D Williams Parsons

  • 1Ludwig Center for Cancer Genetics and Therapeutics and Howard Hughes Medical Institute, Johns Hopkins Kimmel Cancer Center, Baltimore, Maryland, USA.

Human Mutation
|October 20, 2011
PubMed

Insights

Mutations in the ARID1A gene, a chromatin remodeling gene, are common in ovarian clear cell carcinomas. This study found ARID1A mutations in 6% of various cancers, particularly gastrointestinal tumors, suggesting its role in diverse neoplasm development.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Mutations in the ARID1A gene are frequently observed in ovarian clear cell carcinomas (OCCCs).
  • ARID1A plays a crucial role in chromatin remodeling, influencing gene expression and cellular processes.
  • Understanding the broader mutational landscape of ARID1A is essential for comprehending its role in tumorigenesis.

Purpose of the Study:

  • To investigate the prevalence and spectrum of ARID1A mutations across a wide range of human malignant neoplasms.
  • To identify specific tumor types where ARID1A alterations are common.
  • To explore potential correlations between ARID1A mutations and clinicopathological features like microsatellite instability (MSI).

Main Methods:

  • Genomic DNA analysis of 759 malignant neoplasms from various origins (pancreas, breast, colon, stomach, lung, prostate, brain, blood).
  • Sequencing and mutation analysis to detect truncating and nontruncating somatic mutations in the ARID1A gene.
  • Assessment of microsatellite instability (MSI) status in tumors harboring ARID1A mutations.

Main Results:

  • ARID1A mutations were identified in 6% of the evaluated neoplasms, with an additional 0.4% showing nontruncating somatic mutations.
  • Colorectal (10%) and gastric (10%) neoplasms showed the highest frequency of ARID1A mutations.
  • Over half of mutated colorectal and gastric cancers exhibited microsatellite instability (MSI), often linked to frameshift mutations at mononucleotide repeats.

Conclusions:

  • ARID1A inactivation, leading to aberrant chromatin remodeling, is implicated in the development of a diverse array of cancers beyond OCCCs.
  • The high prevalence in gastrointestinal cancers, especially those with MSI, highlights a specific pathway of ARID1A-driven tumorigenesis.
  • These findings underscore the importance of ARID1A as a potential therapeutic target across multiple cancer types.

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