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Similarities and differences between exome sequences found in a variety of tissues from the same individual

AuthorsGómez-Ramos, Alberto; Sanchez-Sanchez, Rafael; Muhaisen Ashraf; Rábano, Alberto; Soriano, Eduardo; Ávila, Jesús
Issue Date1-Jul-2014
PublisherPublic Library of Science
CitationPLoS ONE 9 (2014)
AbstractDNA is the most stable nucleic acid and most important store of genetic information. DNA sequences are conserved in virtually all the cells of a multicellular organism. To analyze the sequences of various individuals with distinct pathological disorders, DNA is routinely isolated from blood, independently of the tissue that is the target of the disease. This approach has proven useful for the identification of familial diseases where mutations are present in parental germinal cells. With the capacity to compare DNA sequences from distinct tissues or cells, present technology can be used to study whether DNA sequences in tissues are invariant. Here we explored the presence of specific SNVs (Single Nucleotide Variations) in various tissues of the same individual. We tested for the presence of tissue-specific exonic SNVs, taking blood exome as a control. We analyzed the chromosomal location of these SNVs. The number of SNVs per chromosome was found not to depend on chromosome length, but mainly on the number of protein-coding genes per chromosome. Although similar but not identical patterns of chromosomal distribution of tissue-specific SNVs were found, clear differences were detected. This observation supports the notion that each tissue has a specific SNV exome signature. © 2014 Gómez-Ramos et al.
Identifiersdoi: 10.1371/journal.pone.0101412
issn: 1932-6203
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