Molecular cloning and characterisation of chicken Atonal homologue 1: a comparison with human Atoh1

[en] Background information: The vertebrate basic helix-loop-helix transcription factor Atoh1 is essential for maturation and survival of mechanosensory hair cells of the inner ear, neurogenesis, differentiation of the intestine, homeostasis of the colon and is implicated in cancer progression. Given that mutations in Atoh1 are detected in malignant tumours, study of functionally different Atoh1 alleles and homologues might yield useful avenues for investigation. The predicted sequence of chicken Atoh1 (cAtoh1) has large regions of dissimilarity to that of mammalian Atoh1 homologues. We hypothesise that cAtoh1 might have intrinsic functional differences to mammalian Atoh1. Results: In this study, we cloned and sequenced the full open reading frame of cAtoh1. In overexpression experiments, we show that this sequence is sufficient to generate a cAtoh1 protein capable of inducing hair cell markers when expressed in nonsensory regions of the developing inner ear, and that morpholino-mediated knock-down using a section of the sequence 5' to the start codon inhibits differentiation of hair cells in the chicken basilar papilla. Furthermore, we compare the behaviour of cAtoh1 and human Atoh1 (hAtoh1) in embryonic mouse cochlear explants, showing that cAtoh1 is a potent inducer of hair cell differentiation and that it can overcome Sox2-mediated repression of hair cell differentiation more effectively than hAtoh1. Conclusions: cAtoh1 is both necessary and sufficient for avian mechanosensory hair cell differentiation. The non-conserved regions of the cAtoh1 coding region have functional consequences on its behaviour.

Disciplines :

Genetics & genetic processes

Author, co-author :

Mulvaney, Joanna

Amemiya, Yutaka

Freeman, Stephen ; Université de Liège > GIGA - Neurosciences

Ladher, Raj

Dabdoub, Alain

Language :

English

Title :

Molecular cloning and characterisation of chicken Atonal homologue 1: a comparison with human Atoh1

Publication date :

2014

Journal title :

Biology of the Cell

ISSN :

0248-4900

eISSN :

1768-322X

Publisher :

Portland Press, Colchester, United Kingdom

Volume :

107

Issue :

Pages :

41-60

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 12 April 2021

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36 (1 by ULiège)

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Bibliography

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