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Although the phenotypic threshold depends on the type of mutation and tissue, it has been shown that a heteroplasmy at least over 60% is necessary to show effects on the enzyme activity of respiratory chain complexes (Rossignol et al, 2003).
Furthermore, studies should be performed in replicative tissues of mitochondrial disease patients with different mtDNA point mutations as this would have profound implications for our understanding of mutation and tissue-specific effects in stem cell compartments.
This work presents a model that incorporates both the sequential acquisition of phenotype altering mutations and tissue hierarchy.
Source, authentication, mutations and tissue of origin of cell lines are documented in the supplementary Data and Table S1, available at Annals of Oncology online.
For instance, new/novel FGs (from Mitelman database and TCGA Fusion Gene Data Portal database) with exon annotations, CDS mutation sites, mutation types, mutation frequency and tissue-specific information for FGs (from COSMIC), mRNA sequence and EST sequence (from ChimerDB, but it is not update since 2010), which are crucial for cancer diagnosis and therapy.
These data demonstrate the differential RNA expression of pro-inflammatory or anti-inflammatory cytokines/mediators and their correlation with type of mutations and tissues, and disease progression.
As suggested by the phenotypes of the imprinting mutations and tissue-specific expression patterns, these microRNAs may silence specific subsets of genes that play a role in organ development, such as brain and muscle.
Models of tumor formation and cell invasion have been created in Drosophila using a wide variety of gene targeting strategies, such as loss-of-function mutations and tissue-specific RNAi knockdown, as well as transgenic overexpression of activated oncogenes found in human cancers.
In this last study, no association was found between the presence of this mutation and PDGFRα tissue expression.
This is also expected, since replication is required for mutation fixation and tissues such as liver have previously been highlighted for low cell turnover [Mirsalis et al., 1989].
