Abstract:
:Somatic mutations in the nuclear genome are required for tumor formation, but the functional consequences of somatic mitochondrial DNA (mtDNA) mutations are less understood. Here we identify somatic mtDNA mutations across 527 tumors and 14 cancer types, using an approach that takes advantage of evidence from both genomic and transcriptomic sequencing. We find that there is selective pressure against deleterious coding mutations, supporting that functional mitochondria are required in tumor cells, and also observe a strong mutational strand bias, compatible with endogenous replication-coupled errors as the major source of mutations. Interestingly, while allelic ratios in general were consistent in RNA compared to DNA, some mutations in tRNAs displayed strong allelic imbalances caused by accumulation of unprocessed tRNA precursors. The effect was explained by altered secondary structure, demonstrating that correct tRNA folding is a major determinant for processing of polycistronic mitochondrial transcripts. Additionally, the data suggest that tRNA clusters are preferably processed in the 3' to 5' direction. Our study gives insights into mtDNA function in cancer and answers questions regarding mitochondrial tRNA biogenesis that are difficult to address in controlled experimental systems.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Stewart JB,Alaei-Mahabadi B,Sabarinathan R,Samuelsson T,Gorodkin J,Gustafsson CM,Larsson Edoi
10.1371/journal.pgen.1005333subject
Has Abstractpub_date
2015-06-30 00:00:00pages
e1005333issue
6eissn
1553-7390issn
1553-7404pii
PGENETICS-D-15-00745journal_volume
11pub_type
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