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Related Experiment Videos

Evolutionary analysis of TATA-less proximal promoter function.

D L Crawford1, J A Segal, J L Barnett

  • 1Division of Molecular Biology and Biochemistry, University of Missouri, Kansas City 64110, USA. crawd@cctr.umkc.edu

Molecular Biology and Evolution
|February 24, 1999
PubMed
Summary

Proximal promoter sequence variations in Fundulus heteroclitus lactate dehydrogenase-B (Ldh-B) affect gene transcription. These functional changes are shaped by natural selection, indicating their biological significance in the whole genome.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Biology

Background:

  • Proximal promoter studies often overlook distal enhancers and chromatin structure.
  • This limits understanding of how sequence variations modulate transcription in a genomic context.

Purpose of the Study:

  • To investigate the functional significance of proximal promoter sequence variation.
  • To determine if these variations are subject to natural selection.

Main Methods:

  • Molecular and evolutionary analyses of the lactate dehydrogenase-B (Ldh-B) proximal promoter in Fundulus heteroclitus.
  • In vivo and in vitro transcription factor binding assays.
  • Comparative sequence analysis of functional and non-functional promoter regions.

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Main Results:

  • Specific regions within the Ldh-B proximal promoter are functionally important for transcription factor binding and gene regulation.
  • Sequence variations in these functional regions are influenced by directional selection.
  • These variations represent phenotypic changes subject to natural selection.

Conclusions:

  • Proximal promoter sequence variations can significantly affect transcriptional processes.
  • These variations are relevant in the natural context of the whole genome and are shaped by evolutionary forces.