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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Quantitative analysis of wobble splicing indicates that it is not tissue specific.

Alternative splicing is an important mechanism mediating the function of genes in multicellular organisms. Recently, we discovered a new splicing-junction wobble mechanism that generates subtle alterations in mRNA by randomly selecting tandem 5' and 3' splicing-junction sites. Here we developed a sensitive approach to identify such splicing-junction wobble isoforms using polymerase chain reaction amplification with fluorescence-labeled primers encompassing the wobble-splicing boundary and capillary electrophoresis. Using the ING4 wobble isoforms as an example, we demonstrated that capillary electrophoresis can precisely separate DNA fragments with a small difference in size (<3 nt) and can be used to quantify the expression ratio, which thus measures the distribution of each splicing-junction wobble isoform in tissues. Based on our analyses of several genes, the relative ratio of each wobble-splicing isoform tends to be constant among various tissues. The occasional observed tissue heterogeneity of wobble-splicing transcripts can be generated only by genomic single-nucleotide polymorphisms around the splicing junction.[1]


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