Evolution of insect dorsoventral patterning mechanisms

M. W. Perry, J. D. Cande, A. N. Boettiger, M. Levine

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

The dorsoventral (DV) patterning of the early Drosophila embryo depends on Dorsal, a maternal sequence-specific transcription factor related to mammalian NF-κB. Dorsal controls DV patterning through the differential regulation of ∼50 target genes in a concentration-dependent manner. Whole-genome methods, including ChIP-chip and ChIP-seq assays, have identified ∼100 Dorsal target enhancers, and more than one-third of these have been experimentally confirmed via transgenic embryo assays. Despite differences in DV patterning among divergent insects, a number of the Dorsal target enhancers are located in conserved positions relative to the associated transcription units. Thus, the evolution of novel patterns of gene expression might depend on the modification of old enhancers, rather than the invention of new ones. As many as half of all Dorsal target genes appear to contain "shadow" enhancers: a second enhancer that directs the same or similar expression pattern as the primary enhancer. Preliminary studies suggest that shadow enhancers might help to ensure resilience of gene expression in response to environmental and genetic perturbations. Finally, most Dorsal target genes appear to contain RNA polymerase II (pol II) prior to their activation. Stalled pol II fosters synchronous patterns of gene activation in the early embryo. In contrast, DV patterning genes lacking stalled pol II are initially activated in an erratic or stochastic fashion. It is possible that stalled pol II confers fitness to a population by ensuring coordinate deployment of the gene networks controlling embryogenesis.

Original languageEnglish (US)
Title of host publicationCold Spring Harbor Symposia on Quantitative Biology
Pages275-279
Number of pages5
DOIs
StatePublished - 2009

Publication series

NameCold Spring Harbor Symposia on Quantitative Biology
Volume74
ISSN (Print)0091-7451

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Genetics

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    Perry, M. W., Cande, J. D., Boettiger, A. N., & Levine, M. (2009). Evolution of insect dorsoventral patterning mechanisms. In Cold Spring Harbor Symposia on Quantitative Biology (pp. 275-279). (Cold Spring Harbor Symposia on Quantitative Biology; Vol. 74). https://doi.org/10.1101/sqb.2009.74.021