A5037029141- Reproductive biology and impacts on aquatic species
- Animal Genetics and Reproduction
- Fish Ecology and Management Studies
- Aquaculture Nutrition and Growth
- Marine Ecology and Invasive Species
- Protist diversity and phylogeny
- Developmental Biology and Gene Regulation
- CRISPR and Genetic Engineering
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Chromosomal and Genetic Variations
- Genomics and Phylogenetic Studies
- Marine Biology and Environmental Chemistry
- Zebrafish Biomedical Research Applications
- Fish Biology and Ecology Studies
- Virus-based gene therapy research
- Congenital heart defects research
- Marine and coastal plant biology
- Aquaculture disease management and microbiota
- Marine Biology and Ecology Research
- Echinoderm biology and ecology
- RNA Interference and Gene Delivery
- Neurobiology and Insect Physiology Research
- Coral and Marine Ecosystems Studies
- Reproductive Biology and Fertility
- Marine Invertebrate Physiology and Ecology
University of Bergen
2014-2025
Ocean University of China
2018-2019
Norwegian Institute of Marine Research
1999-2007
Fish Physiology and Genomics Institute
1984-2001
Département Génétique Animale
1987-2000
Institut National de la Recherche Agronomique
1979-1998
Abstract Reconstructing the genomes of bilaterian ancestors is central to our understanding animal evolution, where knowledge from ancient and/or slow-evolving lineages critical. Here we report a high-quality, chromosome-anchored reference genome for scallop Patinopecten yessoensis , bivalve mollusc that has with many ancestral features. Chromosome-based macrosynteny analysis reveals striking correspondence between 19 chromosomes and 17 presumed linkage groups at level conservation...
Genomes of animals as different sponges and humans show conservation global architecture. Here we that multiple genomic features including transposon diversity, developmental gene repertoire, physical order, intron-exon organization are shattered in the tunicate Oikopleura, belonging to sister group vertebrates retaining chordate morphology. Ancestral architecture animal genomes can be deeply modified may therefore largely nonadaptive. This rapidly evolving lineage thus offers unique...
Abstract Up to now, temperature sex differentiation has been demonstrated in a single fish species, Menidia menidia . This study analyzes this hypothesis Oreochromis niloticus Treatments at 36°C, covering the hormone sensitive period, increased proportion of males (33% 81%). The male was affected by treatments starting not later than 13 days after fertilization and lasting 10 or more. Survival rates were treatments. Functional masculinization genetic females sex‐ratio analysis...
Abstract The causes and consequences of genome reduction in animals are unclear because our understanding this process mostly relies on lineages with often exceptionally high rates evolution. Here, we decode the compact 73.8-megabase Dimorphilus gyrociliatus , a meiobenthic segmented worm. D. retains traits classically associated larger slower-evolving genomes, such as an ordered, intact Hox cluster, generally conserved developmental toolkit traces ancestral bilaterian linkage. Unlike some...
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A key problem in understanding deuterostome evolution has been the origin of chordate body plan. biphasic life cycle with a sessile adult and free-swimming larva is traditionally considered ancestral chordates subsequent neotenic loss stage. Molecular phylogenies challenged this view, suggesting that primitive was entirely free-living as modern day larvaceans. Here, we report precise cell lineage fate map normal embryo larvacean Oikopleura dioica , using 4D microscopy technique transmission...
Gynogenetic rainbow trout lines can be produced easily with the simple UV sperm irradiation technique detailed in this study. The dose effect on embryonic survival rate is called a pseudo "Hertwig effect" because of major differences results gamma irradiation: Some mixing various karyotypes (from diploid to haploid number) were obtained mean doses, probably weak penetrating power ultraviolet rays. Irradiations lasting 4 minutes more are required produce homogeneous progeny; heat shock...
The pan-global marine appendicularian, Oikopleura dioica, shows considerable promise as a candidate model organism for cross-disciplinary research ranging from chordate genetics and evolution to molecular ecology research. This urochordate, has simplified anatomical organization, remains transparent throughout an exceptionally short life cycle of less than 1 week exhibits high fecundity. At 70 Mb, the compact, sequenced genome ranks among smallest known metazoan genomes, with both gene...
trans splicing of a spliced-leader RNA (SL RNA) to the 5' ends mRNAs has been shown have limited and sporadic distribution among eukaryotes. Within metazoans, only nematodes are known process polycistronic pre-mRNAs, produced from operon units transcription, into mature monocistronic via an SL trans-splicing mechanism. Here we demonstrate that chordate with highly compact genome, Oikopleura dioica, now joins Caenorhabditis elegans in coupling processing transcipts. We identified single which...
Hox cluster organization represents a valuable marker to study the effects of recent genome duplication in salmonid fish (25–100 Mya). Using polymerase chain reaction amplification cDNAs, BAC library screening, and walking, we reconstructed 13 clusters Atlantic salmon containing 118 genes including 8 pseudogenes. paralogs resulting from preceding radiation ray-finned have been much better preserved than other model teleosts. The last lineage has followed by loss 1 4 HoxA clusters. Four...
We report the development of OikoBase (http://oikoarrays.biology.uiowa.edu/Oiko/), a tiling array-based genome browser resource for Oikopleura dioica, metazoan belonging to urochordates, closest extant group vertebrates. facilitates retrieval and mining variety useful genomics information. First, it includes which interrogates 1260 genomic sequence scaffolds features gene, transcript CDS annotation tracks. Second, we annotated gene models with ontology (GO) terms InterPro domains are...
We analyzed the medaka optic tectum (OT) morphogenesis by using 5-bromo-2'-deoxyuridine (BrdU) immunohistochemistry (with a new method we developed for pulse-labeling embryos) and in situ hybridization with three probes, two recently cloned homeobox genes (Ol-Prx3 [Paired-Related-Homeobox3] Ol-Gsh1 [Genetic-Screen-Homeobox1]) one Ol-tailless. The tectal anlage first appears as sheet of proliferating cells expressing Ol-tailless but not Ol-Prx3. Cells subsequently cease to proliferate...
Dietary administration of various estrogens for three months from swim-up stage resulted in excess females, the remainder treated groups consisting males and hermaphrodites. Mature hermaphrodites were self-fertilized or mated with standard females. These some estrogen-treated females proved to be genetic males; frequencies obtained their ova averaged 76.6%, suggesting viability YY genotype. Four nine tested those progenies provided all male offspring when