Molecular investigation of larval development and metamorphosis in the American Lobster, Homarus americanus
Notice bibliographique
Résumé
The American lobster, Homarus americanus, is a marine decapod crustacean that\noccurs naturally in the coastal waters o f eastern North America. High concentrations of\nlobster in the Gulf of Maine to the Gulf of St. Lawrence support a significant fishing\nindustry in Atlantic Canada and the northeastern United States. A hard exoskeleton\ncovers and protects H. americanus, which they periodically moult to facilitate growth. H.\namericanus has a complex life history, including a pelagic larval phase and a benthic\nadult phase. The larval phase is divided into three morphologically distinct stages,\nfollowed by metamorphosis to the postlarval phase. Larvae must moult to progress\nthrough each developmental stage. Previous studies have described several\nmorphological, physiological, biochemical and behavioural changes associated with\nmoult, growth and development o f H. americanus. However, the mechanisms that\nregulate these changes are not fully elucidated. This was the first study to use a 14,592 feature, spotted oligonucleotide microarray, to investigate global gene expression changes during H. americanus larval\ndevelopment. Public molecular databases were used to functionally annotate -40% o f\nthe EST sequences. A reference design was used to compare stage specific gene\nexpression profiles of larvae and postlarvae from two year classes. A two-way ANOVA\nwas used to determine significant differences in gene expression levels among the stages\nand year classes. This study found that the expression of 1,851 genes was significantly\ndifferent among larval stages, although 771 genes had significant interaction between\nyear classes and larval stages. Among the differentially expressed genes, functional\nannotations indicated that several genes were involved with the immune system, energy regulation and development. Ten target genes of interest were selected, based on functional annotations, for expression verification using a complementary measurement method, reverse transcriptase quantitative polymerase chain reaction (RT-qPCR). Genes\nwith functional annotations related to immunity, energy regulation, gene expression,\ntranslation and neural or basement membrane remodeling were selected. Two\nPhosphoenolpyruvate carboxykinases, Argonaute 2, Ecdysone inducible protein 75 and\nProcollagen-lysine 2-oxoglutarate 5-dioxygenase 3, were significantly different (P <\n0.05) genes of interest among stages when assayed using RT-qPCR. These genes are\ninvolved with processes that may greatly impact development such as, translation\nregulation, gene expression, morphological development and energy metabolism.\nWith increasing interest in the sustainability of the American lobster fishery, this\nstudy has provided an important foundation for future investigations of processes\nregarding signaling, morphological re-modeling, energy metabolism, and the immune\nsystem as they pertain to larval development. Understanding the mechanisms that\nregulate larval development may give insight into the effects factors such as climate\nchange and anthropomorphic environmental impacts have on early life stages of H.\namericanus.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».