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Multiple Isoforms of ANRIL in Melanoma Cells: Structural Complexity Suggests Variations in Processing
Debina Sarkar1,2, Ali Oghabian3, Pasani K Bodiyabadu4,5
1Auckland Cancer Society Research Centre, University of Auckland, Faculty of Medical and Health Sciences, University of Auckland, 85 Park Rd. Grafton, 1023 Auckland, New Zealand. d.sarkar@auckland.ac.nz.
International Journal of Molecular Sciences
|June 28, 2017
Summary
The long non-coding RNA ANRIL (antisense non-coding RNA in the INK4 locus) exists in multiple linear and circular forms, with distinct cellular locations and stabilities, suggesting dual functions in melanoma.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- The long non-coding RNA ANRIL is transcribed from a gene locus associated with multiple diseases.
- Previous studies identified ANRIL isoforms, but their characterization and tissue-specific expression remain incomplete.
- Understanding ANRIL's diverse isoforms is crucial before fully investigating its functions.
Purpose of the Study:
- To investigate the diversity of ANRIL transcripts, including linear and circular forms, in melanoma cells.
- To characterize the cellular localization and stability of different ANRIL isoforms.
- To explore the potential for distinct functions of ANRIL isoforms in melanoma.
Main Methods:
- Differential expression analysis of ANRIL exons in melanoma cells.
- Identification and characterization of circular ANRIL (circANRIL) isoforms in patient-derived metastatic melanoma cell lines (NZM7 and NZM37).
- Bioinformatic analysis of circANRIL processing and isoform complements.
- Subcellular fractionation to determine the localization of linear and circular ANRIL isoforms.
Main Results:
- Multiple linear and circular ANRIL isoforms were identified in melanoma cells, with distinct complements in different cell lines.
- Novel exons were discovered within ANRIL transcripts.
- Linear ANRIL isoforms were enriched in the nucleus, while circANRIL isoforms were found in the cytoplasm.
- Linear and circular ANRIL isoforms exhibited marked differences in stability.
- Bioinformatic analysis ruled out intronic repeats and exon skipping in circANRIL back-splicing.
Conclusions:
- The ANRIL locus exhibits dynamic processing, generating a rich variety of linear and circular isoforms.
- Distinct subcellular localization and stability suggest that ANRIL isoforms may possess separate functional roles in melanoma.
- Further investigation into the dual functions of ANRIL in melanoma is warranted.
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