Cargando…
The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones
BACKGROUND: Hexamerins are hemocyanin-derived proteins that have lost the ability to bind copper ions and transport oxygen; instead, they became storage proteins. The current study aimed to broaden our knowledge on the hexamerin genes found in the honey bee genome by exploring their structural chara...
Autores principales: | , , , , |
---|---|
Formato: | Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2010
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2861669/ https://www.ncbi.nlm.nih.gov/pubmed/20346164 http://dx.doi.org/10.1186/1471-2199-11-23 |
_version_ | 1782180658050760704 |
---|---|
author | Martins, Juliana R Nunes, Francis MF Cristino, Alexandre S Simões, Zilá LP Bitondi, Márcia MG |
author_facet | Martins, Juliana R Nunes, Francis MF Cristino, Alexandre S Simões, Zilá LP Bitondi, Márcia MG |
author_sort | Martins, Juliana R |
collection | PubMed |
description | BACKGROUND: Hexamerins are hemocyanin-derived proteins that have lost the ability to bind copper ions and transport oxygen; instead, they became storage proteins. The current study aimed to broaden our knowledge on the hexamerin genes found in the honey bee genome by exploring their structural characteristics, expression profiles, evolution, and functions in the life cycle of workers, drones and queens. RESULTS: The hexamerin genes of the honey bee (hex 70a, hex 70b, hex 70c and hex 110) diverge considerably in structure, so that the overall amino acid identity shared among their deduced protein subunits varies from 30 to 42%. Bioinformatics search for motifs in the respective upstream control regions (UCRs) revealed six overrepresented motifs including a potential binding site for Ultraspiracle (Usp), a target of juvenile hormone (JH). The expression of these genes was induced by topical application of JH on worker larvae. The four genes are highly transcribed by the larval fat body, although with significant differences in transcript levels, but only hex 110 and hex 70a are re-induced in the adult fat body in a caste- and sex-specific fashion, workers showing the highest expression. Transcripts for hex 110, hex 70a and hex70b were detected in developing ovaries and testes, and hex 110 was highly transcribed in the ovaries of egg-laying queens. A phylogenetic analysis revealed that HEX 110 is located at the most basal position among the holometabola hexamerins, and like HEX 70a and HEX 70c, it shares potential orthology relationship with hexamerins from other hymenopteran species. CONCLUSIONS: Striking differences were found in the structure and developmental expression of the four hexamerin genes in the honey bee. The presence of a potential binding site for Usp in the respective 5' UCRs, and the results of experiments on JH level manipulation in vivo support the hypothesis of regulation by JH. Transcript levels and patterns in the fat body and gonads suggest that, in addition to their primary role in supplying amino acids for metamorphosis, hexamerins serve as storage proteins for gonad development, egg production, and to support foraging activity. A phylogenetic analysis including the four deduced hexamerins and related proteins revealed a complex pattern of evolution, with independent radiation in insect orders. |
format | Text |
id | pubmed-2861669 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2010 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-28616692010-04-30 The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones Martins, Juliana R Nunes, Francis MF Cristino, Alexandre S Simões, Zilá LP Bitondi, Márcia MG BMC Mol Biol Research article BACKGROUND: Hexamerins are hemocyanin-derived proteins that have lost the ability to bind copper ions and transport oxygen; instead, they became storage proteins. The current study aimed to broaden our knowledge on the hexamerin genes found in the honey bee genome by exploring their structural characteristics, expression profiles, evolution, and functions in the life cycle of workers, drones and queens. RESULTS: The hexamerin genes of the honey bee (hex 70a, hex 70b, hex 70c and hex 110) diverge considerably in structure, so that the overall amino acid identity shared among their deduced protein subunits varies from 30 to 42%. Bioinformatics search for motifs in the respective upstream control regions (UCRs) revealed six overrepresented motifs including a potential binding site for Ultraspiracle (Usp), a target of juvenile hormone (JH). The expression of these genes was induced by topical application of JH on worker larvae. The four genes are highly transcribed by the larval fat body, although with significant differences in transcript levels, but only hex 110 and hex 70a are re-induced in the adult fat body in a caste- and sex-specific fashion, workers showing the highest expression. Transcripts for hex 110, hex 70a and hex70b were detected in developing ovaries and testes, and hex 110 was highly transcribed in the ovaries of egg-laying queens. A phylogenetic analysis revealed that HEX 110 is located at the most basal position among the holometabola hexamerins, and like HEX 70a and HEX 70c, it shares potential orthology relationship with hexamerins from other hymenopteran species. CONCLUSIONS: Striking differences were found in the structure and developmental expression of the four hexamerin genes in the honey bee. The presence of a potential binding site for Usp in the respective 5' UCRs, and the results of experiments on JH level manipulation in vivo support the hypothesis of regulation by JH. Transcript levels and patterns in the fat body and gonads suggest that, in addition to their primary role in supplying amino acids for metamorphosis, hexamerins serve as storage proteins for gonad development, egg production, and to support foraging activity. A phylogenetic analysis including the four deduced hexamerins and related proteins revealed a complex pattern of evolution, with independent radiation in insect orders. BioMed Central 2010-03-26 /pmc/articles/PMC2861669/ /pubmed/20346164 http://dx.doi.org/10.1186/1471-2199-11-23 Text en Copyright ©2010 Martins et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research article Martins, Juliana R Nunes, Francis MF Cristino, Alexandre S Simões, Zilá LP Bitondi, Márcia MG The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title | The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title_full | The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title_fullStr | The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title_full_unstemmed | The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title_short | The four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
title_sort | four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones |
topic | Research article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2861669/ https://www.ncbi.nlm.nih.gov/pubmed/20346164 http://dx.doi.org/10.1186/1471-2199-11-23 |
work_keys_str_mv | AT martinsjulianar thefourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT nunesfrancismf thefourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT cristinoalexandres thefourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT simoeszilalp thefourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT bitondimarciamg thefourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT martinsjulianar fourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT nunesfrancismf fourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT cristinoalexandres fourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT simoeszilalp fourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones AT bitondimarciamg fourhexameringenesinthehoneybeestructuremolecularevolutionandfunctiondeducedfromexpressionpatternsinqueensworkersanddrones |