Exon splicing enhancer

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Overview

An Exonic Splicing Enhancer (ESE) is a sequence of 6 bases within an exon that directs, or enhances, accurate splicing of hetero-nuclear RNA (hnRNA) or pre-mRNA into messenger RNA (mRNA).

The Basics

The central dogma of biology states that all of the information that makes you unique is housed in the nucleus of every cell in your body in the form of DNA. The Human DNA is a string of 3.2 billion base pairs. Short sequences of DNA are transcribed to RNA; then this RNA is translated to a protein. A gene located in the DNA will contain introns and exons. Part of the process of preparing the RNA includes splicing out the introns, sections of RNA that do not code for protein. The presence of Exon splicing Enhancers (ESEs) is essential for proper identification of splice sites by the cellular machinery.

Research

Computational methods were used to identify 238 candidate ESEs Listed here. ESEs are clinically significant because synonymous point mutations previously thought to be Silent mutations located in an ESEs can lead to exon skipping and the production of a non functioning protein.

Disruption of an exon splicing enhancer in exon 3 of MLH1 gene is the cause of HNPCC (human non polyposis colorectal cancer) in a Quebec family. abstract.

There is evidence that these 236 hexamers that signal splicing are evolutionarily conserved. abstract

See also

• Exonic splicing silencer (ESS)

External links

• ESE finder

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .