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Transcriptome Sequencing Analysis Reveals the Regulation of the Hypopharyngeal Glands in the Honey Bee, Apis mellifera carnica Pollmann

ABSTRACT: Transcriptome sequencing has become the main methodology for analyzing the relationship between genes and characteristics of interests, particularly those associated with diseases and economic traits. Because of its functional superiority, commercial royal jelly (RJ) and its production are major areas of focus in the field of apiculture. Multiple lines of evidence have demonstrated that many factors affect RJ output by activating or inhibiting various target genes and signaling pathways to augment their efficient replication. The coding sequences made available by the Honey Bee Genome Sequencing Consortium have permitted a pathway-based approach for investigating the development of the hypopharyngeal glands (HGs). In the present study, 3573941, 3562730, 3551541, 3524453, and 3615558 clean reads were obtained from the HGs of five full-sister honey bee samples using Solexa RNA sequencing technology. These reads were then assembled into 18378, 17785, 17065, 17105, and 17995 unigenes, respectively, and aligned to the DFCI Honey Bee Gene Index database. The differentially expressed genes (DEGs) data were also correlated with detailed morphological data for HGs acini. The results identify areas that warrant further study, including those that can be used to improve honey bee breeding techniques and help ensure stable yields of RJ with high quality traits.

ORGANISM(S): Apis mellifera

PROVIDER: GSE47136 | GEO | 2014/05/20

SECONDARY ACCESSION(S): PRJNA203871

REPOSITORIES: GEO

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Transcriptome Sequencing Analysis Reveals the Regulation of the Hypopharyngeal Glands in the Honey Bee, Apis mellifera carnica Pollmann

Project description:Transcriptome sequencing has become the main methodology for analyzing the relationship between genes and characteristics of interests, particularly those associated with diseases and economic traits. Because of its functional superiority, commercial royal jelly (RJ) and its production are major areas of focus in the field of apiculture. Multiple lines of evidence have demonstrated that many factors affect RJ output by activating or inhibiting various target genes and signaling pathways to augment their efficient replication. The coding sequences made available by the Honey Bee Genome Sequencing Consortium have permitted a pathway-based approach for investigating the development of the hypopharyngeal glands (HGs). In the present study, 3573941, 3562730, 3551541, 3524453, and 3615558 clean reads were obtained from the HGs of five full-sister honey bee samples using Solexa RNA sequencing technology. These reads were then assembled into 18378, 17785, 17065, 17105, and 17995 unigenes, respectively, and aligned to the DFCI Honey Bee Gene Index database. The differentially expressed genes (DEGs) data were also correlated with detailed morphological data for HGs acini. The results identify areas that warrant further study, including those that can be used to improve honey bee breeding techniques and help ensure stable yields of RJ with high quality traits. The 5 samples at given time (d3, d6, d9, d12, d16 after adult worker bees emergence from the comb) are in the critical stage of the RJ secretion and HGs developments indicated (triggered) the further caste differentiation (worker bees and queen) and task switch (nurse bees and foragers). 30 pooled heads of each samples were

2014-05-20 | E-GEOD-47136 | biostudies-arrayexpress

Honeybee hypopharyngeal glands LC-MS/MS

Project description:Royal jelly (RJ) is a proteinaceous secretion of the hypopharyngeal glands (HGs) in the head of honeybee workers. It is a critical food for queen bees and young larvae that decides the fate of fertilized eggs in developing into either queen bees or worker bees during the early larval stages. RJ is also widely used in humans for health promotion as agent, such as antibacterial, antioxidant, and antiaging properties. To increase RJ yields, a stock of high RJ producing honeybees (RJBs) has genetically selected from Italian honeybees (ITBs) in China since 1980s. To date, one colony of RJBs can produce more than 10 kg of RJ per year, a yield that is 10-times greater than that produced by a colony of ITBs. To elucidate the mechanism of the enforced gland performance in producing RJ in RJBs, the spatio-temporal HG proteomes of newly emerged bees, nurse bees, and forager bees, were compared between the ITBs and RJBs. Proteins in the critical pathways that are implicated in the secretory activity of RJ in HGs are validated biochemically and biologically by manipulating the NBs into extended nursing periods and the FBs to revert into NBs. This will provide a novel mechanistic insight into the HGs achieving an enhanced biological mission of producing the valuable bee-product, RJ.

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Investigating the Regulation of Hypopharyngeal Gland Activity in Honeybees Under Nutrition and Brood Pheromone Conditions through RNA-seq Transcriptomics

Project description:The hypopharyngeal gland (HG) is the main site of the synthesis and secretion of royal jelly protein (RJP), and shows high plasticity. To identify differentially expressed genes (DEGs) that affect the development of HG and the synthesis and secretion of RJP, we performed a digital gene expression analysis of 9 d Apis mellifera under different conditions of nutrition and exposure to brood pheromone.Six RNA-seq libraries were generated using RNA extracted from 9 d bee HGs. A total of 2801 DEGs were identified on the basis of at least one pairwise comparison, among which 205, 1617 and 2328 genes were differentially expressed in comparisons between the Pollen group and the Honey group, the Brood group and Pollen group and the Brood group and Honey group respectively. The Brood group exhibited the highest number of DEGs, suggesting that brood pheromone plays a key role in the HG ontogeny. A total of 1991 genes were mapped to 129 canonical signaling pathways found in the Kyoto Encyclopedia of Genes and Genomes (KEGG), and the pathways associated with ribosome function and protein processing were significantly enriched. Hypopharyngeal gland mRNA profiles of 9-day old honeybees under three conditions (one control and two treatments) were generated by deep sequencing, in duplicate, using Illumina Hiseq 2500 platform.

2015-08-06 | E-GEOD-71750 | biostudies-arrayexpress

Investigating the Regulation of Hypopharyngeal Gland Activity in Honeybees Under Nutrition and Brood Pheromone Conditions through RNA-seq Transcriptomics

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2015-08-01 | E-MTAB-3544 | biostudies-arrayexpress

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Project description:Our molecular understanding of honey bee cellular stress responses is incomplete. Previously, we sought to identify and began functional characterization of the components of the UPR in honey bees. We observed that UPR stimulation resulted in induction of target genes upon and IRE1 pathway activation, as assessed by splicing of Xbp1 mRNA. However, were not able to determine the relative role of the various UPR pathways in gene activation. Our understanding of honey bee signal transduction and transcriptional regulation has been hampered by a lack of tools. After using RNAseq to expand the known UPR targets in the bee, we use the Drosophila melanogaster S2 cell line and honey bee trans and cis elements to investigate the role of the IRE-1 pathway in the transcriptional activation of one of these targets, the honey bee Hsc70-3 gene. Using a luciferase reporter, we show that honey bee hsc70 promoter activity is inducible by UPR activation. In addition, we show that this activation is IRE1-dependent and relies on specific cis regulatory elements. Experiments using exogenous honey bee or fruit fly XBP1S proteins demonstrate that both factors can activate the Hsc70-3 promoter and further support a role for the IRE-1 pathway in control of its expression in the honey bee. By providing foundational knowledge about the UPR in the honey bee and demonstrating the usefulness of a heterologous cell line for molecular characterization of honey bee pathways, this work stands to improve our understanding of this critical species.

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