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lncRNA - Long Non-coding RNAs02:39

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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Nutlin-3a efficacy in sarcoma predicted by transcriptomic and epigenetic profiling.

Kathleen I Pishas1, Susan J Neuhaus, Mark T Clayer

  • 1Authors' Affiliations: Sarcoma Research Group, Discipline of Medicine, Centre for Personalised Cancer Medicine, Faculty of Health Sciences, School of Molecular and Biomedical Science, Departments of Orthopaedics and Trauma and Haematology, Cancer Clinical Trials Unit, Royal Adelaide Hospital; Department of Surgery, Royal Adelaide Hospital and University of Adelaide; ACRF Cancer Genomics Facility, Centre for Cancer Biology, Division of Tissue Pathology, SA Pathology; Centre for Neurological Diseases, Hanson Institute and SA Pathology; Department of Radiology, Queen Elizabeth Hospital; Department of Haematology and Oncology, Basil Hetzel Institute and Queen Elizabeth Hospital; University of Adelaide, Discipline of Surgery, Basil Hetzel Institute, Adelaide; Sarcoma Genomics and Genetics Laboratory, Peter MacCallum Cancer Centre, Melbourne, Australia; and Department of Medical Oncology, The Royal Melbourne Hospital, Parkville, Australia.

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Summary
This summary is machine-generated.

Nutlin-3a efficacy in sarcoma treatment is not predicted by TP53 pathway alterations. Global gene expression and epigenetic status, not MDM2 amplification, determine sarcoma sensitivity to p53/MDM2 antagonists.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Nutlin-3a, a p53/MDM2 antagonist, is investigated for sarcoma treatment.
  • Understanding sarcoma sensitivity mechanisms to Nutlin-3a is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the molecular mechanisms of sarcoma sensitivity to Nutlin-3a.
  • To identify reliable biomarkers for predicting Nutlin-3a response in sarcomas.

Main Methods:

  • Ex vivo tissue explant system with 24 sarcoma biopsies.
  • Analysis of TP53 pathway alterations (TP53 status, MDM2/MDM4 amplification/expression, MDM2 SNP309, TP53 SNP72).
  • RNA sequencing for global transcriptomic profiling and expression profiling of TP53 target genes.
  • DNA methylation analysis of the GADD45A promoter region.

Main Results:

  • TP53 pathway alterations did not correlate with apoptotic or cytostatic responses to Nutlin-3a.
  • MDM2 status was not a predictor of Nutlin-3a sensitivity.
  • Global transcriptomic profiles robustly predicted apoptotic responses.
  • Hypermethylation of the GADD45A promoter was observed in non-responsive wild-type TP53 sarcomas.

Conclusions:

  • Sarcoma sensitivity to Nutlin-3a is not determined by TP53 pathway alterations or MDM2 amplification.
  • Global gene expression profiles and epigenetic status are key determinants of sarcoma response to p53/MDM2 antagonists.
  • GADD45A promoter hypermethylation offers mechanistic insight into Nutlin-3a resistance in sarcomas.