Identification and analysis of mutational hotspots in oncogenes and tumour suppressors

Baeissa, Hanadi, Benstead-Hume, Graeme, Richardson, Christopher J and Pearl, Frances M G (2017) Identification and analysis of mutational hotspots in oncogenes and tumour suppressors. Oncotarget, 8 (13). pp. 21290-21304. ISSN 1949-2553

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Abstract

Background: The key to interpreting the contribution of a disease-associated mutation in the development and progression of cancer is an understanding of the consequences of that mutation both on the function of the affected protein and on the pathways in which that protein is involved. Protein domains encapsulate function and position-specific domain based analysis of mutations have been shown to help elucidate their phenotypes.

Results: In this paper we examine the domain biases in oncogenes and tumour suppressors, and find that their domain compositions substantially differ. Using data from over 30 different cancers from whole-exome sequencing cancer genomic projects we mapped over one million mutations to their respective Pfam domains to identify which domains are enriched in any of three different classes of mutation; missense, indels or truncations. Next, we identified the mutational hotspots within domain families by mapping small mutations to equivalent positions in multiple sequence alignments of protein domains

We find that gain of function mutations from oncogenes and loss of function mutations from tumour suppressors are normally found in different domain families and when observed in the same domain families, hotspot mutations are located at different positions within the multiple sequence alignment of the domain.

Conclusions: By considering hotspots in tumour suppressors and oncogenes independently, we find that there are different specific positions within domain families that are particularly suited to accommodate either a loss or a gain of function mutation. The position is also dependent on the class of mutation.

We find rare mutations co-located with well-known functional mutation hotspots, in members of homologous domain superfamilies, and we detect novel mutation hotspots in domain families previously unconnected with cancer. The results of this analysis can be accessed through the MOKCa database (http://strubiol.icr.ac.uk/ extra/MOKCa).

Item Type: Article
Keywords: Cancer, Oncogene, Tumour Suppressor
Schools and Departments: School of Life Sciences > Biochemistry
Subjects: Q Science
Q Science > Q Science (General)
Q Science > QA Mathematics > QA0076 Computer software
R Medicine > R Medicine (General) > R858 Computer applications to medicine. Medical informatics
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Depositing User: Frances Pearl
Date Deposited: 24 Mar 2017 14:29
Last Modified: 17 May 2017 14:15
URI: http://sro.sussex.ac.uk/id/eprint/67169

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Project NameSussex Project NumberFunderFunder Ref
DTG 2011/17G0655MRC-MEDICAL RESEARCH COUNCILMR/J500525/1