Cited by 126Developmental Biology and Gene RegulationNeurogenesis and neuroplasticity mechanismsNeurobiology and Insect Physiology Research

msh may play a conserved role in dorsoventral patterning of the neuroectoderm and mesoderm

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D'Alessio, Marina, Frasch, Manfred·1996·Mechanisms of Development

Abstract

Many of the mechanisms that govern the patterning of the Drosophila neuroectoderm and mesoderm are still unknown. Here we report the sequence, expression, and regulation of the homeobox gene msh, which is likely to play an important role in the early patterning events of these two tissue primordia. msh expression is first observed in late blastoderm embryos and occurs in longitudinal bands of cells that are fated to become lateral neuroectoderm. This expression is under the control of dorsoventral axis-determination genes and depends on dpp-mediated repression in the dorsal half of the embryo and on fib-(EGF-) mediated repression ventrally. The bands of msh expression define the cells that will form the lateral columns of proneural gene expression and give rise to the lateral row of SI neuroblasts. This suggests that msh may be one of the upstream regulators of the achaete-scute (AS-C) genes and may play a role that is analogous to that of the homeobox gene vnd/NK2 in the medial sector of the neuroectoderm. During neuroblast segregation, msh expression is maintained in a subset of neuroblasts, indicating that msh, like vnd/NK2, could function in both dorsoventral patterning of the neuroectoderm and neuroblast specification. The later phase of msh expression that occurs after the first wave of neuroblast segregation in defined ectodermal and mesodermal clusters of cells points to similar roles of msh in patterning and cell fate specification of the peripheral nervous system, dorsal musculature, and the fat body. A comparison of the expression patterns of the vertebrate homologs of msh, vnd/NK2, and AS-C genes reveals striking similarities in dorsoventral patterning of the Drosophila and vertebrate neuroectoderm and indicates that genetic circuitries in neural patterning are evolutionarily conserved.

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  1. Delidakis, C. and Artavanis-Tsakonas, S. (1992) Proc. Natl. Acad. Sci. USA 89.8731-8735.
  2. Fujita, S.C., Zipursky, S.L., Benzer, S., Ferrus, A. and Shotwell, S.L. (1982) Proc. Natl. Acad. Sci. USA 79,7929-7933.
  3. Jan, Y. and Jan, L. (1993a) Proc. Natl. Acad. Sci. USA 90,8305-8397.
  4. Takahashi, Y. and L-e Douarin, N. (1990) Proc. Natl. Acad. Sci. USA 87.7482-7486.

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Authors
D'Alessio, M., & Frasch, M.
Affiliations
Icahn School of Medicine at Mount Sinai (US)
Corresponding author
Frasch, Manfred
Venue
Mechanisms of Development
Publisher
Elsevier BV
Published
1996-08
Volume
58
Issue
1-2
Pages
217-231
ISSN
0925-4773 (ISSN-L)
OpenAlex
W1974215719
Cited by
126
References
88
Citations by year
2026: 1 · 2022: 1 · 2021: 2 · 2020: 2 · 2019: 4 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 2
FWCI
5.35
Type
journal article
Language
en
Open access
Locations
  • Mechanisms of Development (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
Keywords
melanocyte-stimulating hormone, homeobox genes, dorsoventral patterning, neuroectoderm, mesoderm, Drosophila, proneural genes, Dpp signaling, FGF signaling, fat body
MeSH terms
Age Factors, Amino Acid Sequence, Animals, Base Sequence, Drosophila, Ectoderm, Embryo, Nonmammalian, Fat Body, Mesoderm, Molecular Sequence Data, Proto-Oncogene Proteins, Tissue Distribution, Homeodomain Proteins, Insect Proteins, Body Patterning, Drosophila Proteins, Wnt1 Protein, Hedgehog Proteins

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