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Title: A Conserved Developmental Patterning Network Produces Quantitatively Different Output in Multiple Species of Drosophila

Abstract

Differences in the level, timing, or location of gene expression can contribute to alternative phenotypes at the molecular and organismal level. Understanding the origins of expression differences is complicated by the fact that organismal morphology and gene regulatory networks could potentially vary even between closely related species. To assess the scope of such changes, we used high-resolution imaging methods to measure mRNA expression in blastoderm embryos of Drosophila yakuba and Drosophila pseudoobscura and assembled these data into cellular resolution atlases, where expression levels for 13 genes in the segmentation network are averaged into species-specific, cellular resolution morphological frameworks. We demonstrate that the blastoderm embryos of these species differ in their morphology in terms of size, shape, and number of nuclei. We present an approach to compare cellular gene expression patterns between species, while accounting for varying embryo morphology, and apply it to our data and an equivalent dataset for Drosophila melanogaster. Our analysis reveals that all individual genes differ quantitatively in their spatio-temporal expression patterns between these species, primarily in terms of their relative position and dynamics. Despite many small quantitative differences, cellular gene expression profiles for the whole set of genes examined are largely similar. This suggests that cellmore » types at this stage of development are conserved, though they can differ in their relative position by up to 3–4 cell widths and in their relative proportion between species by as much as 5-fold. Quantitative differences in the dynamics and relative level of a subset of genes between corresponding cell types may reflect altered regulatory functions between species. Our results emphasize that transcriptional networks can diverge over short evolutionary timescales and that even small changes can lead to distinct output in terms of the placement and number of equivalent cells.« less

Authors:
 [1];  [2];  [2];  [3];  [2];  [4];  [5];  [6];  [6];  [6];  [6];  [7];  [2]
  1. Univ. of California, Irvine, CA (United States). Dept. of Computer Science
  2. Harvard Medical School, Boston, MA (United States). Dept. of Systems Biology
  3. Harvard Univ., Cambridge, MA (United States). School of Engineering and Applied Sciences
  4. Univ. of California, Berkeley, CA (United States). California Inst. for Quantitative Biosciences
  5. Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Centre for Image Analysis
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Genomics and Life Sciences Division
  7. Univ. of California, Berkeley, CA (United States). California Inst. for Quantitative Biosciences; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Genomics and Life Sciences Division; Univ. of California, Berkeley, CA (United States). howard Hughes Medical Inst.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
OSTI Identifier:
1627293
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
PLoS Genetics
Additional Journal Information:
Journal Volume: 7; Journal Issue: 10; Journal ID: ISSN 1553-7404
Publisher:
Public Library of Science
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; Genetics & Heredity

Citation Formats

Fowlkes, Charless C., Eckenrode, Kelly B., Bragdon, Meghan D., Meyer, Miriah, Wunderlich, Zeba, Simirenko, Lisa, Luengo Hendriks, Cris L., Keränen, Soile V. E., Henriquez, Clara, Knowles, David W., Biggin, Mark D., Eisen, Michael B., and DePace, Angela H. A Conserved Developmental Patterning Network Produces Quantitatively Different Output in Multiple Species of Drosophila. United States: N. p., 2011. Web. doi:10.1371/journal.pgen.1002346.
Fowlkes, Charless C., Eckenrode, Kelly B., Bragdon, Meghan D., Meyer, Miriah, Wunderlich, Zeba, Simirenko, Lisa, Luengo Hendriks, Cris L., Keränen, Soile V. E., Henriquez, Clara, Knowles, David W., Biggin, Mark D., Eisen, Michael B., & DePace, Angela H. A Conserved Developmental Patterning Network Produces Quantitatively Different Output in Multiple Species of Drosophila. United States. https://doi.org/10.1371/journal.pgen.1002346
Fowlkes, Charless C., Eckenrode, Kelly B., Bragdon, Meghan D., Meyer, Miriah, Wunderlich, Zeba, Simirenko, Lisa, Luengo Hendriks, Cris L., Keränen, Soile V. E., Henriquez, Clara, Knowles, David W., Biggin, Mark D., Eisen, Michael B., and DePace, Angela H. Thu . "A Conserved Developmental Patterning Network Produces Quantitatively Different Output in Multiple Species of Drosophila". United States. https://doi.org/10.1371/journal.pgen.1002346. https://www.osti.gov/servlets/purl/1627293.
@article{osti_1627293,
title = {A Conserved Developmental Patterning Network Produces Quantitatively Different Output in Multiple Species of Drosophila},
author = {Fowlkes, Charless C. and Eckenrode, Kelly B. and Bragdon, Meghan D. and Meyer, Miriah and Wunderlich, Zeba and Simirenko, Lisa and Luengo Hendriks, Cris L. and Keränen, Soile V. E. and Henriquez, Clara and Knowles, David W. and Biggin, Mark D. and Eisen, Michael B. and DePace, Angela H.},
abstractNote = {Differences in the level, timing, or location of gene expression can contribute to alternative phenotypes at the molecular and organismal level. Understanding the origins of expression differences is complicated by the fact that organismal morphology and gene regulatory networks could potentially vary even between closely related species. To assess the scope of such changes, we used high-resolution imaging methods to measure mRNA expression in blastoderm embryos of Drosophila yakuba and Drosophila pseudoobscura and assembled these data into cellular resolution atlases, where expression levels for 13 genes in the segmentation network are averaged into species-specific, cellular resolution morphological frameworks. We demonstrate that the blastoderm embryos of these species differ in their morphology in terms of size, shape, and number of nuclei. We present an approach to compare cellular gene expression patterns between species, while accounting for varying embryo morphology, and apply it to our data and an equivalent dataset for Drosophila melanogaster. Our analysis reveals that all individual genes differ quantitatively in their spatio-temporal expression patterns between these species, primarily in terms of their relative position and dynamics. Despite many small quantitative differences, cellular gene expression profiles for the whole set of genes examined are largely similar. This suggests that cell types at this stage of development are conserved, though they can differ in their relative position by up to 3–4 cell widths and in their relative proportion between species by as much as 5-fold. Quantitative differences in the dynamics and relative level of a subset of genes between corresponding cell types may reflect altered regulatory functions between species. Our results emphasize that transcriptional networks can diverge over short evolutionary timescales and that even small changes can lead to distinct output in terms of the placement and number of equivalent cells.},
doi = {10.1371/journal.pgen.1002346},
journal = {PLoS Genetics},
number = 10,
volume = 7,
place = {United States},
year = {Thu Oct 27 00:00:00 EDT 2011},
month = {Thu Oct 27 00:00:00 EDT 2011}
}

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