NDLI: Vertebrate neurogenin evolution: long-term maintenance of redundant duplicates

Content Provider	Springer Nature Link
Author	Furlong, Rebecca F. Graham, Anthony
Copyright Year	2005
Abstract	The majority of the cranial sensory neurons of vertebrates, including all of those concerned with the special senses of hearing, balance and taste, are derived from the neurogenic placodes. A number of studies have shown that the production of neuronal cells by the placodes is dependent upon the function of the neurogenin (ngn) gene family of basic helix–loop–helix transcription factors. One member of the gene family is expressed in each placode, suggesting that this specificity of expression could help to determine different neuronal classes. An interesting feature of this expression, however, is that the expression patterns vary amongst the vertebrates; for example, mammals and fish express ngn-1 in the ophthalmic trigeminal placode where birds use ngn-2. This prompted us to use phylogenetic and genomic analysis to unravel the evolutionary history of this gene family. We determined that the duplication that created the neurogenin-1 and -2 subfamilies occurred deep in the vertebrate lineage before the divergence of bony fish 450 million years ago and suggest that concurrent expression of both genes was probably maintained in all neurogenic placodes until after the divergence of birds and mammals 270 million years ago.
Starting Page	639
Ending Page	644
Page Count	6
File Format	PDF
ISSN	0949944X
Journal	Development Genes and Evolution
Volume Number	215
Issue Number	12
e-ISSN	1432041X
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Placodes Neurogenin Gene duplication Animal Genetics and Genomics Biochemistry Cell Biology Neurosciences Developmental Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Developmental Biology

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