Abstract:
:The vertebrate neural tube consists of a series of neuromeres along its anteroposterior axis. Between amphioxus that possesses no neuromeres and gnathostomes, the lamprey occupies a critical position in the phylogeny for the origin of the segmented brain. To clarify the rhombomeric configuration of the Japanese lamprey, Lampetra japonica, we injected rhodamine- and fluorescein-labeled dextrans into the larval spinal cord, and retrogradely labeled the reticulospinal neurons. We also isolated prosomere marker genes from the embryonic cDNA library of L. japonica, and performed in situ hybridization on the embryonic brain. Of the genes examined, LjOtxA, LjPax6, LjPax2/5/8, LjDlx1/6, and LjTTF-1 were expressed in clearly demarcated polygonal domains. In the telencephalon, LjDlx1/6, LjPax6, and a putative paralogue of LjEmx were expressed in different domains; the LjEmx paralogue was expressed in the dorsal region, and LjDlx1/6 and LjPax6 in a complimentary fashion of the middle part. These expression patterns implied existence of a tripartite configuration of the lamprey telencephalon similar to that in gnathostomes. All these evidences strongly suggest that the segmental and compartmental architecture of the vertebrate brain was already established before the divergence of agnathans and gnathostomes.
journal_name
Brain Res Bulljournal_title
Brain research bulletinauthors
Murakami Y,Ogasawara M,Satoh N,Sugahara F,Myojin M,Hirano S,Kuratani Sdoi
10.1016/s0361-9230(01)00669-4keywords:
subject
Has Abstractpub_date
2002-02-01 00:00:00pages
271-5issue
3-4eissn
0361-9230issn
1873-2747pii
S0361923001006694journal_volume
57pub_type
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