Developmental Genoarchitectonics As a Key Tool to Interpret the Mature Anatomy of the Chondrichthyan Hypothalamus According to the Prosomeric Model

Overview

Journal Front Neuroanat

Date 2022 Aug 22

PMID 35991967

Authors

Gabriel N Santos-Duran

Susana Ferreiro-Galve

Sylvie Mazan

Ramon Anadon

Isabel Rodriguez-Moldes

Eva Candal

Affiliations

Soon will be listed here.

Abstract

The hypothalamus is a key vertebrate brain region involved in survival and physiological functions. Understanding hypothalamic organization and evolution is important to deciphering many aspects of vertebrate biology. Recent comparative studies based on gene expression patterns have proposed the existence of hypothalamic histogenetic domains (paraventricular, TPa/PPa; subparaventricular, TSPa/PSPa; tuberal, Tu/RTu; perimamillary, PM/PRM; and mamillary, MM/RM), revealing conserved evolutionary trends. To shed light on the functional relevance of these histogenetic domains, this work aims to interpret the location of developed cell groups according to the prosomeric model in the hypothalamus of the catshark , a representative of Chondrichthyans (the sister group of Osteichthyes, at the base of the gnathostome lineage). To this end, we review in detail the expression patterns of , , and , as well as Pax6-immunoreactivity in embryos at stage 32, when the morphology of the adult catshark hypothalamus is already organized. We also propose homologies with mammals when possible. This study provides a comprehensive tool to better understand previous and novel data on hypothalamic development and evolution.

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