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Related Experiment Videos

Functional conservation of multiple elements in yeast chromosomal replicators

H Rao1, Y Marahrens, B Stillman

  • 1Cold Spring Harbor Laboratory, New York 11724.

Molecular and Cellular Biology
|November 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study reveals that yeast DNA replication origins (ARSs) share conserved functional elements, even without sequence similarity. These findings highlight the modular nature of replicators in Saccharomyces cerevisiae.

Area of Science:

  • Molecular Biology
  • Genetics
  • Yeast Biology

Background:

  • Autonomously replicating sequences (ARSs) control DNA replication initiation in Saccharomyces cerevisiae.
  • ARS1 contains essential elements A, B1, B2, and B3, with A and B3 being bound by specific proteins.
  • Previous studies found conserved A and B3 elements but lacked identification of conserved B1 and B2 elements across different ARSs.

Purpose of the Study:

  • To investigate the generality of modular structure in yeast replicators.
  • To determine if functional elements B1 and B2 are conserved in other ARSs, like ARS307.
  • To assess the functional conservation of ARS elements despite sequence divergence.

Main Methods:

  • Linker substitution mutagenesis was performed on the yeast replicator ARS307.

Related Experiment Videos

  • Functional equivalence of identified elements in ARS307 to ARS1 elements (A, B1, B2) was assessed.
  • Single-base substitutions were introduced into ARS1 B1 and B2 elements to identify critical nucleotides.

    • Main Results:

    • Three functionally equivalent elements (A, B1, B2) were identified in ARS307, analogous to ARS1.
    • The B1 and B2 elements demonstrated functional conservation between ARS1 and ARS307, despite lacking DNA sequence similarity.
    • Critical nucleotides for B1 element function were identified, while B2 function remained unaffected by single-point mutations.

    Conclusions:

    • Multiple DNA sequence elements appear to be a general and conserved feature of replicator sequences in Saccharomyces cerevisiae.
    • Functional conservation of ARS elements can occur independently of sequence homology.
    • This suggests a conserved modular organization underlying DNA replication initiation in yeast.