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A single nucleotide polymorphism or SNP is a single nucleotide variation at a specific genomic position in a large population. It is the most prevalent type of sequence variation found in the human genome. Point mutations that occur in more than 1% of the population qualify as SNPs. These are present once every 1000 nucleotides on an average in the human genome. Replacement of a purine with another purine (A/G) or a pyrimidine with another pyrimidine (C/T) is known as a transition. In contrast,...
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Inter-species association mapping links splice site evolution to METTL16 and SNRNP27K.

Matthew T Parker1, Sebastian M Fica2, Geoffrey J Barton1

  • 1School of Life Sciences, University of Dundee, Dundee, United Kingdom.

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|October 3, 2023
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Summary

Splicing complexity varies across species due to differences in splice site selection. Researchers found that variations in 5' splice site preferences correlate with specific splicing factors, impacting gene expression.

Keywords:
C. elegansRNA modificationS. cerevisiaeS. pombecomputational biologyevolutiongeneticsgenomicshumaninterspecies association mappingm6Aphylogeneticssplicingsystems biology

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Eukaryotic gene expression involves intron removal via splicing, a process with varying complexity across species.
  • The mechanisms driving differences in splicing patterns between species remain largely unknown.

Purpose of the Study:

  • To investigate the genetic basis for inter-species differences in splicing complexity.
  • To correlate splicing signal phenotypes with the presence or absence of specific splicing factors using inter-species association mapping.

Main Methods:

  • Employed inter-species association mapping in Saccharomycotina species.
  • Analyzed 5' splice site sequence preferences and their correlation with splicing factors like METTL16 and SNRNP27K.
  • Compared findings with existing mutant analyses and spliceosome structural models.

Main Results:

  • Variation in 5' splice site sequence preferences, particularly at the +4 position (A vs. U), correlates with the presence of METTL16 and SNRNP27K.
  • Loss of METTL16 or SNRNP27K orthologs is associated with a preference for +4 U at the 5' splice site.
  • Two major classes of 5' splice sites, differing in U5/U6 snRNA interaction potential, vary across species and correlate with intron number.

Conclusions:

  • Inter-species association mapping is a valuable method for studying splicing mechanisms.
  • Evolutionary changes in splicing signal phenotypes are linked to variations in 5' splice site selection processes involving U6 snRNA.