Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

Kuratani, Shigeru; Horigome, Naoto; Ueki, Tomoyuki; Aizawa, Shinichi; Hirano, Shigeki

doi:10.1002/(sici)1096-9861(19980202)391:1<99::aid-cne9>3.0.co;2-m

Cited by 61 publications

(42 citation statements)

References 78 publications

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“…Segmentation of the embryonic lamprey hindbrain is apparent only transiently (Kuratani et al, 1998a), making it difficult to find morphological markers indicating rostrocaudal position.…”

Section: Migration Of Neural Crest Cells Arising From the Midbrain Rmentioning

confidence: 99%

Neural crest contributions to the lamprey head

2003

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The neural crest is a vertebrate-specific cell population that contributes to the facial skeleton and other derivatives. We have performed focal DiI injection into the cranial neural tube of the developing lamprey in order to follow the migratory pathways of discrete groups of cells from origin to destination and to compare neural crest migratory pathways in a basal vertebrate to those of gnathostomes. The results show that the general pathways of cranial neural crest migration are conserved throughout the vertebrates, with cells migrating in streams analogous to the mandibular and hyoid streams. Caudal branchial neural crest cells migrate ventrally as a sheet of cells from the hindbrain and super-pharyngeal region of the neural tube and form a cylinder surrounding a core of mesoderm in each pharyngeal arch, similar to that seen in zebrafish and axolotl. In addition to these similarities, we also uncovered important differences. Migration into the presumptive caudal branchial arches of the lamprey involves both rostral and caudal movements of neural crest cells that have not been described in gnathostomes, suggesting that barriers that constrain rostrocaudal movement of cranial neural crest cells may have arisen after the agnathan/gnathostome split. Accordingly, neural crest cells from a single axial level contributed to multiple arches and there was extensive mixing between populations. There was no apparent filling of neural crest derivatives in a ventral-to-dorsal order, as has been observed in higher vertebrates, nor did we find evidence of a neural crest contribution to cranial sensory ganglia. These results suggest that migratory constraints and additional neural crest derivatives arose later in gnathostome evolution.

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“…Segmentation of the embryonic lamprey hindbrain is apparent only transiently (Kuratani et al, 1998a), making it difficult to find morphological markers indicating rostrocaudal position.…”

Section: Migration Of Neural Crest Cells Arising From the Midbrain Rmentioning

confidence: 99%

Neural crest contributions to the lamprey head

2003

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“…The mesencephalic trigeminal nucleus is also important with regard to vertebrate evolution as it is characteristic of the jawed vertebrates, the gnathostomes; both hagfish and lampreys, which are extant agnathans, lack an MTN (Weinberg, 1928;Kuratani et al, 1998). Furthermore, the emergence of these sensory neurons is generally believed to have been concomitant with the evolution of the jaw itself.…”

Section: Introductionmentioning

confidence: 99%

Early development of the mesencephalic trigeminal nucleus

Hunter

Begbie

Mason

et al. 2001

Developmental Dynamics

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The cells of the mesencephalic trigeminal nucleus (MTN) are the proprioceptive sensory neurons that innervate the jaw muscles. Interestingly, their evolution is generally thought to have been concomitant with that of the jaws. They are also the first born neurons of the mesencephalon, and their axons pioneer some of the major tracts within the brain. The cells of the MTN are also paradoxical in being the only group of intramedullary primary sensory neurons in amniotes. However, we know little about the early development of these important neurons, and we have analysed this here. To study the earliest stages of MTN development, we have used a battery of neural crest markers to try and pinpoint the progenitors of the MTN. We find that, contrary to current perceptions, the progenitors of the MTN are not highlighted by these markers, suggesting that they are not neural crest derived. However, the cells of the MTN are marked by means of their expression of Brn-3a. This gene labels cells that arise either side of the dorsal midline, extending rostrally from the isthmus across the roof of the mesencephalon. We have further demonstrated that the MTN develops under the influence of the Fgf-8 secreted by the isthmus. Ectopic Fgf-8 application promotes MTN development, whereas inhibiting Fgf-8 function in vivo drastically affects MTN development.

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“…Notably, these early systems of protein gradient production not only instruct overall brain area patterning (Shimogori and Grove, 2005; O'Leary et al, 2007; Assimacopoulos et al, 2012), but also serve as guidance cues for growing axons (Charron et al, 2003; Walshe and Mason, 2003; Tole et al, 2006; Zou and Lyuksyutova, 2007; Toyama et al, 2013). Similarly, as described in more detail below, the spatial locations of these organizing centers broadly coincide with regions of commissural axon crossing, such as the post-optic commissure and posterior commissure, which are the first commissures to form during vertebrate development (Figure 1B; Herrick, 1937; Kuratani et al, 1998; Doldan et al, 2000; Barreiro-Iglesias et al, 2008). Thus, the conservation of these early mechanisms of forebrain development across vertebrate species suggest that area patterning and cell-specification functions may have been co-opted for axon guidance and commissural circuit formation.…”

Section: Conservation Of a Developmental Plan In The Vertebrate Brainmentioning

confidence: 67%

Evolution and development of interhemispheric connections in the vertebrate forebrain

Suárez

Gobius

Richards

2014

Front. Hum. Neurosci.

138

139

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Axonal connections between the left and right sides of the brain are crucial for bilateral integration of lateralized sensory, motor, and associative functions. Throughout vertebrate species, forebrain commissures share a conserved developmental plan, a similar position relative to each other within the brain and similar patterns of connectivity. However, major events in the evolution of the vertebrate brain, such as the expansion of the telencephalon in tetrapods and the origin of the six-layered isocortex in mammals, resulted in the emergence and diversification of new commissural routes. These new interhemispheric connections include the pallial commissure, which appeared in the ancestors of tetrapods and connects the left and right sides of the medial pallium (hippocampus in mammals), and the corpus callosum, which is exclusive to eutherian (placental) mammals and connects both isocortical hemispheres. A comparative analysis of commissural systems in vertebrates reveals that the emergence of new commissural routes may have involved co-option of developmental mechanisms and anatomical substrates of preexistent commissural pathways. One of the embryonic regions of interest for studying these processes is the commissural plate, a portion of the early telencephalic midline that provides molecular specification and a cellular scaffold for the development of commissural axons. Further investigations into these embryonic processes in carefully selected species will provide insights not only into the mechanisms driving commissural evolution, but also regarding more general biological problems such as the role of developmental plasticity in evolutionary change.

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Stereotyped axonal bundle formation and neuromeric patterns in embryos of a cyclostome,Lampetra japonica

Cited by 61 publications

References 78 publications

Neural crest contributions to the lamprey head

Neural crest contributions to the lamprey head

Early development of the mesencephalic trigeminal nucleus

Evolution and development of interhemispheric connections in the vertebrate forebrain

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