Cortical lamination in a polyprotodont marsupial, Perameles nasuta

Abbie, A. A.

doi:10.1002/cne.900760310

Cited by 89 publications

(38 citation statements)

References 15 publications

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“…For example, a dual origin model postulates that paleocortex contributes to lateral neocortex and archicortex to dorsomedial neocortex, which is supported by our findings in cKO-E mice that lateral neocortex refates into paleocortical PC, whereas dorsomedial neocortex retains a neocortical-like fate. Our findings also support a model that both PC and neocortex have evolved from ventrolateral telencephalon1,35-37, specifically, our findings that dTel progenitors of the Emx1 lineage that generate PC and neocortex are genetically almost identical, at least as neuroepithelial cells prior to their fate restriction, with only the expression level of Lhx2 functionally distinguishing them. Thus, Lhx2 specification of regional fate of cerebral cortex serves a critical role not only during development, but likely also during evolution.…”

Section: Discussionsupporting

confidence: 89%

Lhx2 specifies regional fate in Emx1 lineage of telencephalic progenitors generating cerebral cortex

et al. 2009

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Cerebral cortex is comprised of regions including six-layer neocortex and three-layer olfactory cortex generated by telencephalic progenitors of an Emx1 lineage. The mechanism specifying region-specific subpopulations within this lineage is unknown. We show in mouse that the LIM homeodomain transcription factor Lhx2, expressed in graded levels by progenitors, determines their regional identity and fate decisions to generate neocortex or olfactory cortex. Emx1-Cre deletion of Lhx2 at E10.5 refates progenitors to generate three-layer cortex phenocopying olfactory cortex rather than lateral neocortex. Progenitors do not generate ectopic olfactory cortex following Lhx2 deletion at E11.5. Thus, Lhx2 regulates a regional-fate decision by telencephalic progenitors during a critical period that closes as they differentiate from neuroepithelial cells to neuronogenic radial glia. “Exposure” of progenitors to Lhx2 may dictate their regional-fate decisions. These findings establish a genetic mechanism determining regional fate in the Emx1 lineage of telencephalic progenitors that generate cerebral cortex.

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Section: Discussionsupporting

confidence: 89%

Lhx2 specifies regional fate in Emx1 lineage of telencephalic progenitors generating cerebral cortex

et al. 2009

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“…Studies of cortical architecture in aplacental mammals, such as those by Abbie (1940Abbie ( , 1942, have been helpful to trace neocortical development. They reveal that the neocortex is made of two separate components or moieties, one adjoining the hippocampus and the other the piriform area, that develop in opposite directions around the hemisphere and meet on its lateral aspect.…”

Section: Evolution and Comparative Anatomymentioning

confidence: 99%

“…It is uncertain whether, in the human and anthropoids, it is the medial or the inferior frontal fissure that represents the posterior extremity of the sulcus principalis (Connolly, 1950;Ariëns Kappers et al, 1960). His studies essentially uphold for primates the principle of the dual evolutionary development of the neocortex formerly upheld in lower mammals (Abbie, 1940(Abbie, , 1942. Sanides (1964Sanides ( , 1970 carried out a remarkable effort to read phylogenetic history into the architecture of the prefrontal cortex.…”

Section: Evolution and Comparative Anatomymentioning

confidence: 99%

Anatomy of the Prefrontal Cortex

Fuster

2015

The Prefrontal Cortex

347

342

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“…The work of Abbie (, ), Filimonoff (, ), Gastaut and Lammers (), Sanides (, ), Stephan (), Mesulam and Mufson (, ), Pandya and Yeterian (), Morán, Mufson, and Mesulam (), Altman and Bayer (), Gloor (), and Nieuwenhuys () emphasized that mammals, in general, show a transitional cortical band which forms a ring‐shaped mesocortex domain (Filimonoff, ) intercalated between the allocortex ring and the neocortex/isocortex. Both Filimonoff () and Sanides () further divided the mesocortical transition into two steps with progressively increasing histologic complexity, named respectively periallocortex and proisocortex .…”

Section: The Concentric Ring Theory Of the Palliummentioning

confidence: 99%

Concentric ring topology of mammalian cortical sectors and relevance for patterning studies

Puelles

Alonso

Garcı́a-Calero

et al. 2019

J of Comparative Neurology

158

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Models aiming to explain causally the evolutionary or ontogenetic emergence of the pallial isocortex and its regional/areal heterogeneity in mammals use simple or complex assumptions about the pallial structure present in basal mammals and nonmammals. The question arises: how complex is the pattern that needs to be accounted for in causal models? This topic is also paramount for comparative purposes, since some topological relationships may be explained as being ancestral, rather than newly emerged. The mouse pallium is apt to be reexamined in this context, due to the breadth of available molecular markers and correlative experimental patterning results. We center the present essay on a recapitulative glance at the classic theory of concentric mammalian allo‐, meso‐, and neocortex domains. In its simplest terms, this theory postulates a central neocortical island (6 layers) separated by a surrounding mesocortical ring (4–5 layers) from a peripheral allocortical ring (3 layers). These territories show additional partition into regional or areal subdivisions. There are also borderline amygdalar, claustral, and septal areas of the pallium, nuclear in structure. There has been little effort so far to contemplate the full concentric ring model in current “cortex patterning” models. In this essay, we recapitulate the ring idea in mammals (mouse) and consider a potential causal patterning scenario using topologic models. Finally, we briefly explore how far this theory may apply to pallium models proposed recently for sauropsids.

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Cortical lamination in a polyprotodont marsupial, Perameles nasuta

Cited by 89 publications

References 15 publications

Lhx2 specifies regional fate in Emx1 lineage of telencephalic progenitors generating cerebral cortex

Lhx2 specifies regional fate in Emx1 lineage of telencephalic progenitors generating cerebral cortex

Anatomy of the Prefrontal Cortex

Concentric ring topology of mammalian cortical sectors and relevance for patterning studies

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