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The pathobiology of splicing Ward AJ; Cooper TAJ Pathol 2010[Jan]; 220 (2): 152-63Ninety-four percent of human genes are discontinuous, such that segments expressed as mRNA are contained within exons and separated by intervening segments, called introns. Following transcription, genes are expressed as precursor mRNAs (pre-mRNAs), which are spliced co-transcriptionally, and the flanking exons are joined together to form a continuous mRNA. One advantage of this architecture is that it allows alternative splicing by differential use of exons to generate multiple mRNAs from individual genes. Regulatory elements located within introns and exons guide the splicing complex, the spliceosome, and auxiliary RNA binding proteins to the correct sites for intron removal and exon joining. Misregulation of splicing and alternative splicing can result from mutations in cis-regulatory elements within the affected gene or from mutations that affect the activities of trans-acting factors that are components of the splicing machinery. Mutations that affect splicing can cause disease directly or contribute to the susceptibility or severity of disease. An understanding of the role of splicing in disease expands potential opportunities for therapeutic intervention by either directly addressing the cause or by providing novel approaches to circumvent disease processes.|Alternative Splicing/genetics[MESH]|Exons/genetics[MESH]|Genes, Neoplasm/genetics[MESH]|Genetic Predisposition to Disease/*genetics[MESH]|Genetic Therapy/methods[MESH]|Humans[MESH]|Introns/genetics[MESH]|Mutation[MESH]|Neoplasms/genetics[MESH]|RNA Splicing/*genetics[MESH]|RNA, Messenger/biosynthesis/genetics[MESH] |
