Comparison of diverged Hoxc8 early enhancer activities reveals modification of regulatory interactions at conserved cis-acting elements

Cooduvalli S. Shashikant, Stacey A. Bolanowsky, Sanjay Anand, Shawn M. Anderson

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Hoxc8 early enhancer that controls the initiation and establishment of Hoxc8 expression in the developing mouse embryo is found in different vertebrate lineages including mammals, birds and fish. Mouse and Fugu Hoxc8 early enhancers (200 bp) have diverged in the composition of elements located towards the 3′ region. However, they share cis-acting elements A-E located in the 5′ region. Mutations at these elements in the context of the mouse Hoxc8 early enhancer affect reporter gene expression in the posterior neural tube, somites and lateral plate mesoderm of day 9.5 mouse embryos. Here, we demonstrate that mutations introduced at the same elements but in the context of the Fugu Hoxc8 early enhancer had different consequences on the reporter gene expression in transgenic mouse embryos. Furthermore, in contrast to the mouse enhancer the Fugu enhancer does not utilize elements D and E in achieving posterior neural tube and somite expression. These results suggest that the diverged sequences prevent regulatory interactions at conserved cis-acting elements. We propose that divergent sequences modify regulatory interactions at conserved elements by providing a "contextual change". Our finding that the enhancer elements do not act in a unitary fashion but function in the context of the surrounding sequence brings a new dimension to the study of cis-regulatory evolution.

Original languageEnglish (US)
Pages (from-to)242-249
Number of pages8
JournalJournal of Experimental Zoology Part B: Molecular and Developmental Evolution
Volume308
Issue number3
DOIs
StatePublished - May 15 2007

Fingerprint

Takifugu
embryo
gene expression
mutation
mice
Somites
Neural Tube
Embryonic Structures
embryo (animal)
regulatory sequences
Reporter Genes
reporter genes
vertebrate
mammal
Gene Expression
Mutation
bird
enhancer elements
Mesoderm
Transgenic Mice

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Molecular Medicine
  • Animal Science and Zoology
  • Genetics
  • Developmental Biology

Cite this

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title = "Comparison of diverged Hoxc8 early enhancer activities reveals modification of regulatory interactions at conserved cis-acting elements",
abstract = "The Hoxc8 early enhancer that controls the initiation and establishment of Hoxc8 expression in the developing mouse embryo is found in different vertebrate lineages including mammals, birds and fish. Mouse and Fugu Hoxc8 early enhancers (200 bp) have diverged in the composition of elements located towards the 3′ region. However, they share cis-acting elements A-E located in the 5′ region. Mutations at these elements in the context of the mouse Hoxc8 early enhancer affect reporter gene expression in the posterior neural tube, somites and lateral plate mesoderm of day 9.5 mouse embryos. Here, we demonstrate that mutations introduced at the same elements but in the context of the Fugu Hoxc8 early enhancer had different consequences on the reporter gene expression in transgenic mouse embryos. Furthermore, in contrast to the mouse enhancer the Fugu enhancer does not utilize elements D and E in achieving posterior neural tube and somite expression. These results suggest that the diverged sequences prevent regulatory interactions at conserved cis-acting elements. We propose that divergent sequences modify regulatory interactions at conserved elements by providing a {"}contextual change{"}. Our finding that the enhancer elements do not act in a unitary fashion but function in the context of the surrounding sequence brings a new dimension to the study of cis-regulatory evolution.",
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Comparison of diverged Hoxc8 early enhancer activities reveals modification of regulatory interactions at conserved cis-acting elements. / Shashikant, Cooduvalli S.; Bolanowsky, Stacey A.; Anand, Sanjay; Anderson, Shawn M.

In: Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, Vol. 308, No. 3, 15.05.2007, p. 242-249.

Research output: Contribution to journalArticle

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