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- W2128624375 abstract "Abstract Background The nuclear receptor superfamily currently consists of seven gene subfamilies that encompass over 80 distinct receptor proteins. These transcription factors typically share a common five-domain structure with a highly conserved DNA-binding domain. Some nuclear receptors are ubiquitous among the metazoans, while others are unique to specific phylogenetic groups. Crustaceans represent the second largest group of arthropods with insects being the largest. However, relative to insects, little is known about the nuclear receptors of crustaceans. The aim of this study was to identify putative nuclear receptors from the first assembled genome of a crustacean Daphnia pulex http://wFleaBase.org . Nuclear receptor expression was evaluated and receptors were subjected to phylogenetic analyses to gain insight into evolution and function. Results Twenty-five putative nuclear receptors were identified in D. pulex based on the presence of a conserved DNA-binding domain. All of the nuclear receptor protein sequences contain a highly homologous DNA-binding domain and a less conserved ligand-binding domain with the exception of the NR0A group. These receptors lack a ligand-binding domain. Phylogenetic analysis revealed the presence of all seven receptor subfamilies. The D. pulex genome contains several nuclear receptors that have vertebrate orthologs. However, several nuclear receptor members that are represented in vertebrates are absent from D. pulex . Notable absences include receptors of the 1C group (peroxisome proliferators-activated receptors), the 3A group (estrogen receptor), and the 3C group (androgen, progestogen, mineralcorticoid, and glucocorticoid receptors). The D. pulex genome also contains nuclear receptor orthologs that are present in insects and nematodes but not vertebrates, including putative nuclear receptors within the NR0A group. A novel group of receptors, designated HR97, was identified in D. pulex that groups with the HR96/CeNHR8/48/DAF12 clade, but forms its own sub-clade. Gene products were detected in adult female D. pulex for 21 of the 25 receptors. Conclusion Nuclear receptors are ancient proteins with highly conserved DNA-binding domains. The DNA-binding domains of the nuclear receptors of D. pulex contain the same degree of conservation that is typically found within nuclear receptors of other species. Most of the receptors identified in D. pulex have orthologs within the vertebrate and invertebrate lineages examined with the exception of the novel HR97 group and the Dappu-HR10 and potentially the Dappu-HR11 receptors found in D. pulex . These groups of receptors may harbour functions that are intrinsic to crustacean physiology." @default.
- W2128624375 created "2016-06-24" @default.
- W2128624375 creator A5012272194 @default.
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- W2128624375 date "2009-10-28" @default.
- W2128624375 modified "2023-10-06" @default.
- W2128624375 title "Annotation, phylogenetics, and expression of the nuclear receptors in Daphnia pulex" @default.
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- W2128624375 doi "https://doi.org/10.1186/1471-2164-10-500" @default.
- W2128624375 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2774871" @default.
- W2128624375 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19863811" @default.
- W2128624375 hasPublicationYear "2009" @default.
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