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Early Development of the Thalamo-Pallial Stage of the Tectofugal Visual Pathway in the Chicken (Gallus gallus)
Indexado
WoS WOS:001268958600001
Scopus SCOPUS_ID:85198050650
DOI 10.1002/CNE.25657
Año 2024
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



The tectofugal pathway is a highly conserved visual pathway in all amniotes. In birds and mammals, retinorecipient neurons located in the midbrain roof (optic tectum/superior colliculus) are the source of ascending projections to thalamic relays (nucleus rotundus/caudal pulvinar), which in turn project to specific pallial regions (visual dorsal ventricular ridge [vDVR]/temporal cortex) organized according to a columnar recurrent arrangement of interlaminar circuits. Whether or to which extent these striking hodological correspondences arise from comparable developmental processes is at present an open question, mainly due to the scarcity of data about the ontogeny of the avian tectofugal system. Most of the previous developmental studies of this system in birds have focused on the establishment of the retino-tecto-thalamic connectivity, overlooking the development of the thalamo-pallial-intrapallial circuit. In this work, we studied the latter in chicken embryos by means of immunohistochemical assays and precise ex vivo crystalline injections of biocytin and DiI. We found that the layered organization of the vDVR as well as the system of homotopic reciprocal connections between vDVR layers were present as early as E8. A highly organized thalamo-vDVR projection was also present at this stage. Our immunohistochemical assays suggest that both systems of projections emerge simultaneously even earlier. Combined with previous findings, these results reveal that, in striking contrast with mammals, the peripheral and central stages of the avian tectofugal pathway develop along different timelines, with a tecto-thalamo-intrapallial organization arising before and possibly independently of the retino-isthmo-tectal circuit.

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Disciplinas de Investigación



WOS
Zoology
Neurosciences
Scopus
Neuroscience (All)
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Reyes-Pinto, Rosana Mujer Universidad de Chile - Chile
Universidad Mayor - Chile
2 Rojas, Maria-Jose - Universidad de Chile - Chile
2 Rojas, María José - Universidad de Chile - Chile
3 LETELIER-PARGA, JUAN CARLOS Hombre Universidad de Chile - Chile
4 Marin, Gonzalo J. Hombre Universidad de Chile - Chile
Universidad Finis Terrae - Chile
5 MPODOZIS-MARIN, JORGE Hombre Universidad de Chile - Chile

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Financiamiento



Fuente
FONDECYT
Fondo Nacional de Desarrollo Científico y Tecnológico

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Agradecimientos



Agradecimiento
This work was supported by FONDECYT Grant 1210069 to J.M.; FONDECYT Grant 1210169 to G.J.M.; postdoctoral FONDECYT Grant 3220417 to R.R.P. We gratefully acknowledge Patricio Ahumada-Galleguillos and Carmen Gloria Lemus for help with confocal imaging. We thank Elisa Sentis and Solano Henriquez for expert technical help.
This work was supported by FONDECYT (Grant 1210069 to J.M.); FONDECYT (Grant 1210169 to G.J.M.); postdoctoral FONDECYT (Grant 3220417 to R.R.P.). Funding:
This work was supported by FONDECYT (Grant 1210069 to J.M.); FONDECYT (Grant 1210169 to G.J.M.); postdoctoral FONDECYT (Grant 3220417 to R.R.P.). Funding:

Muestra la fuente de financiamiento declarada en la publicación.