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Related Concept Videos

RNA Splicing01:32

RNA Splicing

60.8K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
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Pre-mRNA Processing: RNA Splicing01:36

Pre-mRNA Processing: RNA Splicing

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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Alternative RNA Splicing02:18

Alternative RNA Splicing

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Chromatin Structure and RNA Splicing02:41

Chromatin Structure and RNA Splicing

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pre-mRNA Processing02:01

pre-mRNA Processing

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl...
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Related Experiment Video

Updated: Feb 19, 2026

Using the E1A Minigene Tool to Study mRNA Splicing Changes
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The splicing code.

Marco Baralle1, Francisco Ernesto Baralle1

  • 1International Centre for Genetic Engineering and Biotechnology, Padriciano 99, Italy.

Bio Systems
|November 11, 2017
PubMed
Summary

The genetic code is largely universal across species, but biological codes like RNA splicing are complex and context-dependent. Deciphering these intricate codes remains an ongoing challenge in biology.

Area of Science:

  • Molecular Biology
  • Genetics
  • Bioinformatics

Background:

  • The genetic code, discovered over 50 years ago, is remarkably conserved from bacteria to humans, with minimal variations.
  • Unlike the genetic code, other biological codes, such as those governing RNA splicing, exhibit complexity and context-dependency.
  • RNA splicing codes are influenced by various factors including cell type, tissue, and developmental stage, making them less amenable to unambiguous deciphering.

Purpose of the Study:

  • To explore the nature of biological codes, contrasting the conserved genetic code with the complex splicing code.
  • To summarize the current understanding and progress made in deciphering the RNA splicing code.
  • To highlight the challenges in creating algorithms for predicting exon definition and fate due to splicing code complexity.
Keywords:
Alternative splicingAplicing regulatorsRNA binding proteinsSplicing codeSplicing regulatory elements

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Main Methods:

  • Comparative analysis of the genetic code's universality versus the variability of RNA splicing codes.
  • Review of factors influencing RNA splicing, including cellular and developmental contexts.
  • Discussion of the challenges and progress in computational approaches to understand splicing regulation.

Main Results:

  • The genetic code demonstrates high conservation, with a specific RNA sequence (5' GUGUUC 3') consistently translating to Val-Phe across diverse organisms.
  • Ambiguities in the genetic code can arise from mutations in transfer RNAs (tRNAs) and associated enzymes.
  • The RNA splicing code is highly complex, influenced by numerous factors and lacking a definitive algorithmic solution for predicting exon splicing outcomes.

Conclusions:

  • The universality of the genetic code provides a foundational principle in molecular biology.
  • The RNA splicing code represents a more dynamic and context-specific regulatory system, analogous to social codes in its flexibility.
  • Significant advancements have been made in understanding the splicing code, yet a complete algorithmic deciphering remains a future goal.