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The evolutionary origins of vertebrate midbrain and MHB: insights from mouse, amphioxus and ascidian Dmbx homeobox genes.

Abstract：

:Comparative studies on developmental gene expression suggest that the ancestral chordate central nervous system comprised anterior, midbrain-hindbrain boundary (MHB) and posterior regions. The most anterior region consists of both forebrain and midbrain in vertebrates. It remains, however, unresolved when or how the vertebrate midbrain was established from this anterior zone. I previously reported a mouse PRD-class homeobox gene, Dmbx1, expressed in the presumptive midbrain at early developmental stages, and in the hindbrain at later stages, with exclusion from the MHB. To investigate the evolution of midbrain development, I have cloned Dmbx genes from amphioxus and from Ciona, representing the two most closely related lineages to the vertebrates, and examined embryonic Dmbx expression in these species. In amphioxus, no Dmbx expression is observed in the neural tube, supporting previous arguments that the MHB equivalent region has been secondarily lost in evolution. In Ciona, the CiDmbx gene is detected in neural cells posterior to Pax-2/5/8-positive cells (MHB homologue), but not in any cells anterior to them. These results support the lack of a midbrain homologue in Ciona, and suggest that midbrain development is a vertebrate innovation. Here, I report the full sequences of these genes and discuss the evolution of midbrain development in relation to the tripartite neural ground plan and the origin of the MHB organizer.

journal_name

Brain Res Bull

journal_title

Brain research bulletin

authors

Takahashi T

doi

10.1016/j.brainresbull.2005.03.013

keywords:

subject

Has Abstract

pub_date

2005-09-15 00:00:00

pages

510-7

issue

4-6

eissn

0361-9230

issn

1873-2747

pii

S0361-9230(05)00110-3

journal_volume

66

pub_type

杂志文章

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