A developmental study of serotonin-immunoreactive neurons in the embryonic brain of the Marbled Crayfish and the Migratory Locust: Evidence for a homologous protocerebral group of neurons

Zieger, Elisabeth; Bräunig, Peter; Harzsch, Steffen

doi:10.1016/j.asd.2013.08.004

Cited by 17 publications

(12 citation statements)

References 90 publications

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“…The same antibody has been applied in several studies on arthropod nervous systems [23, 27, 34–37]. Preadsorption controls showed that the antibody does not recognize a BSA-epitope instead of 5HT (see datasheet manufacturer; [34, 35]).…”

Section: Methodsmentioning

confidence: 99%

Serotonergic neurons in the ventral nerve cord of Chilopoda – a mandibulate pattern of individually identifiable neurons

Sombke

Stemme

2017

Zoological Lett

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BackgroundGiven the numerous hypotheses concerning arthropod phylogeny, independent data are needed to supplement knowledge based on traditional external morphology and modern molecular sequence information. One promising approach involves comparisons of the structure and development of the nervous system. Along these lines, the morphology of serotonin-immunoreactive neurons in the ventral nerve cord has been investigated in numerous tetraconate taxa (Crustacea and Hexapoda). It has been shown that these neurons can be identified individually due to their comparably low number, characteristic soma position, and neurite morphology, thus making it possible to establish homologies at the single cell level. Within Chilopoda (centipedes), detailed analyses of major branching patterns of serotonin-immunoreactive neurons are missing, but are crucial for developing meaningful conclusions on the homology of single cells.ResultsIn the present study, we re-investigated the distribution and projection patterns of serotonin-immunoreactive neurons in the ventral nerve cord of three centipede species: Scutigera coleoptrata, Lithobius forficatus, and Scolopendra oraniensis. The centipede serotonergic system in the ventral nerve cord contains defined groups of individually identifiable neurons. An anterior and two posterior immunoreactive neurons per hemiganglion with contralateral projections, a pair of ipsilateral projecting lateral neurons (an autapomorphic character for Chilopoda), as well as a postero-lateral group of an unclear number of cells are present in the ground pattern of Chilopoda.ConclusionsComparisons to the patterns of serotonin-immunoreactive neurons of tetraconate taxa support the homology of anterior and posterior neurons. Our results thus support a sister group relationship of Myriapoda and Tetraconata and, further, a mandibulate ground pattern of individually identifiable serotonin-immunoreactive neurons in the ventral nerve cord. Medial neurons are not considered to be part of the tetraconate ground pattern, but could favor the ‘Miracrustacea hypothesis’, uniting Remipedia, Cephalocarida, and Hexapoda.

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Section: Methodsmentioning

confidence: 99%

Serotonergic neurons in the ventral nerve cord of Chilopoda – a mandibulate pattern of individually identifiable neurons

Sombke

Stemme

2017

Zoological Lett

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“…The fi rst structure to display serotonin immunoreactivity is a cluster of neurons in the lateral protocerebrum which extend their neurites across the brain midline towards the contralateral part of the lateral protocerebrum (Fig. 4.10A-D ;Zieger et al 2013 ). Likewise, the fi rst neurons to express pigment-dispersing hormone immunoreactivity (Fig.…”

Section: Emergence Of the Early Axonal Scaffoldmentioning

confidence: 96%

“…In the developing crayfi sh brain, the emergence of serotonin immunoreactivity has also been examined as in lobster embryos (Sandeman and Sandeman 1990 ;Helluy et al 1993 ;Zieger et al 2013 ), but it is important to note that the developmental histories of crayfi sh and lobsters display distinct timing differences (Helluy et al 1993 ;Harzsch 2003a ). The fi rst structure to display serotonin immunoreactivity is a cluster of neurons in the lateral protocerebrum which extend their neurites across the brain midline towards the contralateral part of the lateral protocerebrum (Fig.…”

Section: Emergence Of the Early Axonal Scaffoldmentioning

confidence: 99%

“…In embryos of C. destructor , the Marmorkrebs, and the American lobster, the embryonic emergence of the olfactory lobes which appear in the last quarter of embryogenesis was analysed from silver-stained sections and by serotonin immunohistochemistry ( Fig. 4.10D ; Helluy et al 1993 ;Harzsch et al 1999b ;Zieger et al 2013 ). Backfi lling the cut antenna 1 with fl uorescent dyes in C. destructor revealed that afferents begin to grow towards the olfactory lobes from mid-embryogenesis onwards (Sandeman and Sandeman 2000 ).…”

Section: Embryonic Development Of the Olfactory Systemmentioning

confidence: 99%

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“Crustacea”: Decapoda – Astacida

Harzsch

Krieger

Faulkes³

2015

Evolutionary Developmental Biology of Invertebrates 4

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“…Even so, different members within a given phylum have sufficiently similar overall body plans, so that homologies can often be proposed between their component parts at both morphological and molecular levels (arthropod examples will be used here) [55,56]. Such homologies, when examined in the framework of a widely acceptable branching pattern within the phylum [57], can give plausible insights into some of the detailed changes that took place along the evolutionary lines connecting the nodes for the extant subgroups.…”

Section: Nervous System Evolution Within Phyla Versus Between Phylamentioning

confidence: 99%

Nervous systems and scenarios for the invertebrate-to-vertebrate transition

Holland¹

2016

Phil. Trans. R. Soc. B

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One contribution of 16 to a discussion meeting issue 'Homology and convergence in nervous system evolution'. Older evolutionary scenarios for the origin of vertebrates often gave nervous systems top billing in accordance with the notion that a big-brained Homo sapiens crowned a tree of life shaped mainly by progressive evolution. Now, however, tree thinking positions all extant organisms equidistant from the tree's root, and molecular phylogenies indicate that regressive evolution is more common than previously suspected. Even so, contemporary theories of vertebrate origin still focus on the nervous system because of its functional importance, its richness in characters for comparative biology, and its central position in the two currently prominent scenarios for the invertebrate-tovertebrate transition, which grew out of the markedly neurocentric annelid and enteropneust theories of the nineteenth century. Both these scenarios compare phyla with diverse overall body plans. This diversity, exacerbated by the scarcity of relevant fossil data, makes it challenging to establish plausible homologies between component parts (e.g. nervous system regions). In addition, our current understanding of the relation between genotype and phenotype is too preliminary to permit us to convert gene network data into structural features in any simple way. These issues are discussed here with special reference to the evolution of nervous systems during proposed transitions from invertebrates to vertebrates.

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A developmental study of serotonin-immunoreactive neurons in the embryonic brain of the Marbled Crayfish and the Migratory Locust: Evidence for a homologous protocerebral group of neurons

Cited by 17 publications

References 90 publications

Serotonergic neurons in the ventral nerve cord of Chilopoda – a mandibulate pattern of individually identifiable neurons

Serotonergic neurons in the ventral nerve cord of Chilopoda – a mandibulate pattern of individually identifiable neurons

“Crustacea”: Decapoda – Astacida

Nervous systems and scenarios for the invertebrate-to-vertebrate transition

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