<i>Enc1</i> expression in the chick telencephalon at intermediate and late stages of development

Garcı́a-Calero, Elena; Puelles, Luis

doi:10.1002/cne.22164

Cited by 17 publications

(18 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such connections would have been lost as the neocortex finally emerged in early mammals. Birds are known to have lost most of their pallial olfactory target areas [Reiner and Karten, 1985;Puelles et al, 2007;García-Calero and Puelles, 2009], whereas the primitive telencephalon of lampreys is almost completely dominated by olfactory input [Puelles, 2001]. Loss or transformation of initially olfactory pallial areas is therefore an old trend in pallial evolution.…”

Section: Tangential Migration Of Heterogeneous Cr Cellsmentioning

confidence: 99%

Pallio-Pallial Tangential Migrations and Growth Signaling: New Scenario for Cortical Evolution?

Puelles¹

2011

Brain Behav Evol

Self Cite

120

View full text Add to dashboard Cite

Observations accruing in recent years imply that the areal patterning and size dimensioning of the mammalian neocortex are influenced by diverse sets of tangentially migrating glutamatergic neurons that invade the cortical plate and, in so doing, modify the properties of the neopallial proliferative compartments. This developmental scenario sheds new light upon the old issue of how the mammalian neocortex evolved its more complex structure from nonmammalian antecedent forms. In reviewing these novelties, I first point out the topological position of the neopallial island as a central component of the pallium in all gnathostomes, surrounded by a ring of prospective allocortical pallial regions and a more distant set of peripheral neighboring forebrain areas. Early patterning arises from the periphery via passive planar signaling. This process probably establishes the pallium field and its basic island plus allocortical ring organization, as well as a rough prepatterning of some regional subareas. Afterwards, patterning and modulated growth are also actively influenced by the convergence of separate streams of tangentially migrating subpial cells (partly peripheral and partly allocortical in origin) which collectively form the Cajal-Retzius neuronal population in layer I. Effects of these cells include the inside-out stratification of the cortical plate and they may also contribute to the evolutionary emergence of the 6-layered neocortical structure. The most recent addition to our knowledge of pallio-pallial migrations is the existence of a subsequent deep tangential migration of ventropallial cells into the neopallial primordium, whose signaling influence upon local progenitors magnifies the cortex population by 20%. These glutamatergic cells dispersedly invade the entire cortex but largely die postnatally. The crucial implications of these data for comparative thinking on mammalian neocortex evolution and interpretation of potential homologs in sauropsids are explored. Finally, a new conjecture regarding a possible role of the hitherto disregarded lateral pallium is advanced.

show abstract

Section: Tangential Migration Of Heterogeneous Cr Cellsmentioning

confidence: 99%

Pallio-Pallial Tangential Migrations and Growth Signaling: New Scenario for Cortical Evolution?

Puelles¹

2011

Brain Behav Evol

Self Cite

120

View full text Add to dashboard Cite

show abstract

“…The hippocampal region has been variously described in birds as it pertains to the medial pallium [Garcia-Calero and Puelles, 2009]. In the pigeon, the dorsomedial hippocampal formation has been suggested to be homologous to Ammon's horn [Atoji and Wild, 2004], while in passerine birds the dorsomedial area was suggested to be homologous to dentate gyrus and the ventral subdivision homologous to Ammon's horn [Szekely, 1999].…”

Section: Comparative Considerationsmentioning

confidence: 99%

“…A similar consideration applies to the caudal part of nidopallium, which is an associative area [Garcia-Calero and Puelles, 2009]: at variance with the rodent-associative cortex [Mucignat-Caretta and Caretta, 2002], the caudal nidopallium presents persistent, intensely labeled RI aggregates that never showed the diffuse type of labeling observed in rodent cortex.…”

Section: Comparative Considerationsmentioning

confidence: 99%

Aggregates of cAMP-Dependent Kinase Isoforms Characterize Different Areas in the Developing Central Nervous System of the Chicken, <i>Gallus gallus</i>

Mucignat‐Caretta

Caretta²

2011

Dev Neurosci

View full text Add to dashboard Cite

The intracellular second messenger adenosine 3′,5′-cyclic monophosphate (cAMP) acts mainly through cAMP-dependent protein kinases (PKA). In mammals and reptiles, the PKA regulatory isoforms (RI and RII) are differentially distributed among the various brain areas and cell types, according to the age of the animal. Since PKA distribution may be an additional marker for homologous areas, PKA regulatory subunit types RI and RII were examined in the chicken brain, a species not yet investigated. Chicken brains were examined from prehatching to adult age, by means of immunohistochemistry and biochemical characterization. Most PKA regulatory subunits were segregated in discrete non-soluble clusters that contained either RI or RII. While RII aggregates were present also in non-neuronal cells, RI aggregates were detected only in neurons of some brain areas that are mainly related to the telencephalon. They appeared later than RII aggregates; their presence and location varied during development. RI aggregates were detected first in the olfactory bulb, around embryonic day 14; within 3 days they appeared in the hyperpallium and nidopallium, where the most intense labeling was observed in the perihatching period. Fainter RI aggregates persisted up to 3 years in the olfactory bulb and nidopallium caudale. Less intense RI aggregates were present for a shorter time, from 2 weeks to 3 months, in the septal nuclei, thalamic medial nuclei, periventricular hypothalamus, optic tectum periventricular area, brainstem reticular formation and spinal cord substantia gelatinosa. RI aggregates were not detected in many brain areas including the arcopallium, striatum and cranial nerve nuclei. RII distribution showed less variation during development. From embryonic day 12, some insoluble RII aggregates were detected in the brain; however, only minor modifications were observed in positive structures once they started to harbor insoluble RII aggregates. The present results suggest that the distribution of PKA aggregates may assist in characterizing phylogenetically homologous structures of the vertebrate central nervous system and may also unravel biochemical differences among areas considered homologous.

show abstract

“…the hippocampus proper and the parahippocampal area (PHi), are two telencephalic regions that play a major role in memory tasks. In recent years, the PHi has been well described in chickens [Redies et al, 2001, Kovjanic andRedies, 2003;Puelles et al, 2007;Garcia-Calero and Puelles, 2009]. The PHi is a radial domain adjacent to the hippocampus proper.…”

mentioning

confidence: 99%

“…The PHi finally makes contact with the piriform cortex in the caudolateral pole of the telencephalon. The PHi is subdivided into 5 radial subdomains which show a cortical structure [Redies et al, 2001, Kovjanic andRedies, 2003;Puelles et al, 2007;Garcia-Calero and Puelles, 2009]. Recently, Abellan et al [2014] added a new rostral subdivision in the chicken PHi.…”

mentioning

confidence: 99%

FoxP1 Protein Shows Differential Layer Expression in the Parahippocampal Domain among Bird Species

Garcı́a-Calero

2016

Brain Behav Evol

View full text Add to dashboard Cite

Different bird orders show diversity in neural capabilities supported by variations in brain morphology. The parahippocampal domain in the medial pallium, together with the hippocampus proper, plays an important role in memory skills. In the present work, we analyze the expression pattern of the FoxP1 protein in the parahippocampal area of four different bird species: the nonvocal learner birds quail and chicken (Galliformes) and two vocal learner birds, i.e. the zebra finch (Passeriformes) and the budgerigar (Psittaciformes), at different developmental and adult stages. We also analyze the expression of the calbindin protein in quails and zebra finches. We observed differences in the FoxP1 parahippocampal layer among bird species. In quails, chickens, and budgerigar, FoxP1 cells were located in the outer layers of the lateral and caudolateral parahippocampal sectors. In contrast, FoxP1 immunoreactive cells appeared in the inner layer of the same sectors in the zebra finch parahippocampal domain. These differences suggest two possibilities: either the FoxP1-positive cells described in quails, chickens, and budgerigars are a different population than the one described in the zebra finch, or there are changes in the pattern of radial migration in the parahippocampal area among birds. In the present study, we show that FoxP1 expression is more similar between quails, chickens, and budgerigars than between budgerigars and zebra finches in the parahippocampal area. This result contrasts with previous data in other telencephalic structures, like the calbindin-positive projection neurons described in the striatum of budgerigars and zebra finches but not in quails and chickens. All of these data point to diversity in the evolution of different morphological characters and, therefore, a mosaic model for telencephalic evolution in birds.

show abstract

Enc1 expression in the chick telencephalon at intermediate and late stages of development

Cited by 17 publications

References 89 publications

Pallio-Pallial Tangential Migrations and Growth Signaling: New Scenario for Cortical Evolution?

Pallio-Pallial Tangential Migrations and Growth Signaling: New Scenario for Cortical Evolution?

Aggregates of cAMP-Dependent Kinase Isoforms Characterize Different Areas in the Developing Central Nervous System of the Chicken, <i>Gallus gallus</i>

FoxP1 Protein Shows Differential Layer Expression in the Parahippocampal Domain among Bird Species

Contact Info

Product

Resources

About