Formation of new sensory cells in deafferented tuberous organs of the gymnotid fish <i>Eigenmannia virescens</i>

Bensouilah, Mourad; Denizot, Jérémy

doi:10.1002/jnr.490390506

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…It has been suggested that ampullary electroreceptors in siluriforms (catfishes), and both ampullary and tuberous electroreceptors in gymnotiforms, are induced to form in local surface ectoderm by lateral line nerves (Vischer et al, 1989; Roth, 2003). However, gymnotiform tuberous electroreceptors can develop in the absence of innervation (Bensouilah and Denizot, 1994; Weisleder et al, 1994; Weisleder et al, 1996). Furthermore, siluriform ampullary electroreceptors initially develop in the lateral zones of lateral line placode-derived sensory primordia, flanking the lines of differentiating neuromasts (Northcutt, 2003), just like lateral line placode-derived ampullary organs in non-teleosts (Northcutt et al, 1995; Modrell et al, 2011a).…”

Section: Electroreception Evolved Independently At Least Twice Withinmentioning

confidence: 99%

The evolution and development of vertebrate lateral line electroreceptors

Baker

Modrell

Gillis

2013

Journal of Experimental Biology

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SummaryElectroreception is an ancient vertebrate sense with a fascinating evolutionary history involving multiple losses as well as independent evolution at least twice within teleosts. We review the phylogenetic distribution of electroreception and the morphology and innervation of electroreceptors in different vertebrate groups. We summarise recent work from our laboratory that has confirmed the homology of ampullary electroreceptors in non-teleost jawed vertebrates by showing, in conjunction with previously published work, that these are derived embryonically from lateral line placodes. Finally, we review hypotheses to explain the distribution of electroreception within teleosts, including the hypothesis that teleost ampullary and tuberous electroreceptors evolved via the modification of mechanosensory hair cells in lateral line neuromasts. We conclude that further experimental work on teleost electroreceptor development is needed to test such hypotheses.

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Section: Electroreception Evolved Independently At Least Twice Withinmentioning

confidence: 99%

The evolution and development of vertebrate lateral line electroreceptors

Baker

Modrell

Gillis

2013

Journal of Experimental Biology

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“…These cells are considered secretory cells since their apical cytoplasm appears to contain the same polysaccharides found in the intraepidermal cavity (Denizot, 1969;Derbin et al, 1969). However, some of these cells apparently can be transformed into sensory cells in case of degeneration of the sensory cell (Denizot and Libouban, 1985; see also Bensouilah and Denizot, 1994). This capacity for regeneration is limited to the extent that after experimental regeneration in G. petersii (Denizot and Bensouilah, unpubl.…”

Section: Discussionmentioning

confidence: 99%

Larval electroreceptors in the epidermis of mormyrid fish: II. The promormyromast

Denizot

Bensouilah

Roesler

et al. 2007

J of Comparative Neurology

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Promormyromasts were found in the epidermis of the head of the larvae of five species of mormyrids bred in captivity. The promormyromast is a larval electroreceptor belonging to the specific lateral line system. In 12-day-old larvae this electroreceptor is characterized by a single sensory cell and two types of accessory cells. One type of accessory cell has dark cytoplasm, few microtubules, and contacts the sensory cell directly, whereas a second type has pale cytoplasm, many microtubules, and forms an outer layer not directly in contact with the sensory cell. This second type is referred to as a long pyriform accessory cell. This assembly of cells is situated below an intraepidermal cavity filled with acid polysaccharides. The bordering epidermal cells extend microvilli into the intraepidermal cavity. The apexes of the sensory cell, and of the two types of accessory cells, also open into the intraepidermal cavity but bear no microvilli. The promormyromast is innervated by an unmyelinated sensory nerve fiber passing through the basal membrane, which then splits into several branches between the accessory cells. These branches contact the periphery of the sensory cell with terminal boutons. At the site of each contact a ribbon-like structure surrounded by vesicles is present in the cytoplasm of the sensory cell. In older larvae of Campylomormyrus cassaicus, membrane foldings develop at the periphery of the pyriform accessory cells and accessory cell staining properties change just before transformation to become a mormyromast. The functional role of the promormyromast of the larval mormyrids is discussed.

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Larval electroreceptors in the epidermis of mormyrid fish: I. Tuberous organs of type A and B

Bensouilah

Schugardt

Roesler

et al. 2002

J of Comparative Neurology

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Two types of larval electroreceptors, type A and B, are described in the epidermis of the head of larvae of three mormyrid species, Campylomormyrus cassaicus, Mormyrus rume proboscirostris and Pollimyrus isidori, bred in captivity. In each of these electroreceptor organs, a single sensory cell is found inside an intraepidermal cavity, sitting on a platform of accessory cells. The cavity is filled with microvilli originating both from the sensory cell and from the epidermal covering cells lining the intraepidermal cavity. These two types of tuberous larval electroreceptors differ in their distribution in the epidermis of the head, in the composition of their accessory cells, and by their innervation. The innervation found in type B organs is similar to that already described for electroreceptors of adult mormyrids. The sensorineural junction is composed of primary afferent terminal boutons, which contact the base of the sensory cell. Opposite each terminal bouton, a ribbon-like synaptic bar surrounded by vesicles is found in the cytoplasm of the sensory cell. In contrast, the base of the sensory cell in type A larval electroreceptors is not contacted by nervous terminal boutons, but instead forms closed appositions with specialized prolongations of accessory cells of the platform. The base of the sensory cell presents membrane evaginations, with hemispheric synaptic structures and few synaptic vesicles. These two types of electroreceptor organs degenerate at the time of the degeneration of the larval electric organ and the functional differentiation of the adult electric organ. The functional role of two tuberous electroreceptor types is examined.

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Formation of new sensory cells in deafferented tuberous organs of the gymnotid fish Eigenmannia virescens

Cited by 7 publications

References 33 publications

The evolution and development of vertebrate lateral line electroreceptors

The evolution and development of vertebrate lateral line electroreceptors

Larval electroreceptors in the epidermis of mormyrid fish: II. The promormyromast

Larval electroreceptors in the epidermis of mormyrid fish: I. Tuberous organs of type A and B

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