Abstract
Hir/Hira (histone regulation) genes were first identified in yeast as negative regulators of histone gene expression. It has been confirmed that HIRA is a conserved family of proteins present in various animals and plants. In this paper, the cDNAs of the Hira homolog named CagHira and CaHira were isolated from gynogenetic gibel carp (gyno-carp) and gonochoristic color crucian carp (gono-carp) respectively. The full-length CagHira is 3,860 bp in length with an open reading frame (ORF) of 3,033 bp that encodes 1,011 amino acids, while the full-length CaHira is 3,748 bp in length and also has an ORF of 3,033 bp. The deduced amino acid sequences of both Hira homologs contain seven WD domains and show high identity with other HIRA family members. RT-PCR analyses revealed strong expression of Hira in the ovaries, whereas no expression was detected in the testes of either of the fishes. Hira transcription was not detected in the liver of gyno-carp, but a high level of Hira mRNA was observed in gono-carp. The temporal expression pattern showed that the Hira mRNA is consistently expressed during all embryonic development stages in gyno-carp. However, the abundance of CaHira mRNA significantly decreased (P < 0.05) shortly after fertilization and then increased again and remained stable from gastrula till hatching. The varying spatiotemporal expression patterns of Hira genes in gyno-carp and gono-carp may be associated with the differing reproductive modes used by these two closely related fishes. Our results suggest that Hira may play a role not only in the decondensation of sperm nucleus and the formation of pronucleus during fertilization, but also in gastrulation and the subsequent development of embryos.
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Acknowledgements
This work was supported by the National Nature Science Foundation of China (30671609) and grants from the foundation of State Key Laboratory of Freshwater Ecology and Biotechnology (2005FB20). We thank Conor McMeniman of the School of Integrative Biology, University of Queensland, Australia, for reading the manuscript and giving helpful comments.
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Du, X.Z., Zhou, L., Zhao, H.B. et al. Identical sequences but different expression patterns of Hira gene in gynogenetic and gonochoristic crucian carps. Fish Physiol Biochem 34, 175–184 (2008). https://doi.org/10.1007/s10695-007-9158-1
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DOI: https://doi.org/10.1007/s10695-007-9158-1
Keywords
- Hira gene
- cDNA cloning
- Gene expression
- Gynogenesis
- Gibel carp