Blar i Sars International Centre for Marine Molecular Biology på forfatter "Hejnol, Andreas"
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Active mode of excretion across digestive tissues predates the origin of excretory organs
Andrikou, Carmen; Thiel, Daniel; Ruiz-Santiesteban, Juan A.; Hejnol, Andreas (Journal article; Peer reviewed, 2019)Most bilaterian animals excrete toxic metabolites through specialized organs, such as nephridia and kidneys, which share morphological and functional correspondences. In contrast, excretion in non-nephrozoans is largely ... -
An ancient FMRFamide-related peptide-receptor pair induces defense behavior in a brachiopod larva
Thiel, Daniel; Bauknecht, Philipp; Jékely, Gáspár; Hejnol, Andreas (Journal article; Peer reviewed, 2017)Animal behaviour often comprises spatially separated sub-reactions and even ciliated larvae are able to coordinate sub-reactions of complex behaviours (metamorphosis, feeding). How these sub-reactions are coordinated is ... -
Ciliary photoreceptors in the cerebral eyes of a protostome larva
Passamaneck, Yale J.; Furchheim, Nina; Hejnol, Andreas; Martindale, Mark Q.; Lüter, Carsten (Peer reviewed; Journal article, 2011-03-01)Background: Eyes in bilaterian metazoans have been described as being composed of either ciliary or rhabdomeric photoreceptors. Phylogenetic distribution, as well as distinct morphologies and characteristic deployment of ... -
Cleavage modification did not alter blastomere fates during bryozoan evolution
Vellutini, Bruno Cossermelli; Martin Duran, Jose Maria; Hejnol, Andreas (Journal article; Peer reviewed, 2017-04-28)Background: Stereotypic cleavage patterns play a crucial role in cell fate determination by precisely positioning early embryonic blastomeres. Although misplaced cell divisions can alter blastomere fates and cause embryonic ... -
Combinatorial Wnt signaling landscape during brachiopod anteroposterior patterning
Vellutini, Bruno Cossermelli; Martin Duran, Jose Maria; Børve, Aina; Hejnol, Andreas (Journal article; Peer reviewed, 2024)Background Wnt signaling pathways play crucial roles in animal development. They establish embryonic axes, specify cell fates, and regulate tissue morphogenesis from the early embryo to organogenesis. It is becoming ... -
Conservative route to genome compaction in a miniature annelid
Martin-Duran, José M.; Vellutini, Bruno Cossermelli; Marletaz, Ferdinand; Cetrangolo, Viviana; Cvetesic, Nevena; Thiel, Daniel; Henriet, Simon; Grau-Bové, Xavier; Carrillo-Baltodano, Allan M.; Gu, Wenjia; Kerbl, Alexandra; Marquez, Yamile; Bekkouche, Nicolas; Chourrout, Daniel; Gómez-Skarmeta, José Luis; Irimia, Manuel; Lenhard, Boris; Worsaae, Katrine; Hejnol, Andreas (Journal article; Peer reviewed, 2021)The causes and consequences of genome reduction in animals are unclear because our understanding of this process mostly relies on lineages with often exceptionally high rates of evolution. Here, we decode the compact ... -
Coordinated spatial and temporal expression of Hox genes during embryogenesis in the acoel Convolutriloba longifissura
Hejnol, Andreas; Martindale, Mark Q. (Journal article; Peer reviewed, 2009-10-01)Background: Hox genes are critical for patterning the bilaterian anterior-posterior axis. The evolution of their clustered genomic arrangement and ancestral function has been debated since their discovery. As acoels appear ... -
Detailed reconstruction of the musculature in Limnognathia maerski (Micrognathozoa) and comparison with other Gnathifera
Bekkouche, Nicolas; Kristensen, Reinhardt M.; Hejnol, Andreas; Sørensen, Martin V.; Worsaae, Katrine (Journal article; Peer reviewed, 2014-10-01)Introduction: Limnognathia maerski is the single species of the recently described taxon, Micrognathozoa. The most conspicuous character of this animal is the complex set of jaws, which resembles an even more intricate ... -
Development and juvenile anatomy of the nemertodermatid Meara stichopi (Bock) Westblad 1949 (Acoelomorpha)
Børve, Aina; Hejnol, Andreas (Journal article; Peer reviewed, 2014-07-07)Introduction: Nemertodermatida is the sister group of the Acoela, which together form the Acoelomorpha, a taxon that comprises bilaterally symmetric, small aquatic worms. While there are several descriptions of the embryology ... -
Development of the larval anterior neurogenic domains of Terebratalia transversa (Brachiopoda) provides insights into the diversification of larval apical organs and the spiralian nervous system
Santagata, Scott; Resh, Carlee; Hejnol, Andreas; Martindale, Mark Q.; Passamaneck, Yale J. (Peer reviewed; Journal article, 2012-01-24)Background: Larval features such as the apical organ, apical ciliary tuft, and ciliated bands often complicate the evaluation of hypotheses regarding the origin of the adult bilaterian nervous system. Understanding how ... -
Embracing the comparative approach: How robust phylogenies and broader developmental sampling impacts the understanding of nervous system evolution
Hejnol, Andreas; Lowe, Christopher J. (Journal article; Peer reviewed, 2015-11-09)Molecular biology has provided a rich dataset to develop hypotheses of nervous system evolution. The startling patterning similarities between distantly related animals during the development of their central nervous system ... -
Embryonic chirality and the evolution of spiralian left - right asymmetries
Martin Duran, Jose Maria; Vellutini, Bruno Cossermelli; Hejnol, Andreas (Journal article; Peer reviewed, 2016-12)The group Spiralia includes species with one of the most significant cases of left–right asymmetries in animals: the coiling of the shell of gastropod molluscs (snails). In this animal group, an early event of embryonic ... -
Embryonic expression of priapulid Wnt genes
Hogvall, Mattias; Vellutini, Bruno Cossermelli; Martin-Duran, José M.; Hejnol, Andreas; Budd, Graham E.; Janssen, Ralf (Journal article; Peer reviewed, 2019-07)Posterior elongation of the developing embryo is a common feature of animal development. One group of genes that is involved in posterior elongation is represented by the Wnt genes, secreted glycoprotein ligands that signal ... -
Evolution and development of the adelphophagic, intracapsular Schmidt's larva of the nemertean Lineus ruber
Martin Duran, Jose Maria; Vellutini, Bruno Cossermelli; Hejnol, Andreas (Journal article; Peer reviewed, 2015-09-28)Background: The life cycle of many animals includes a larval stage, which has diversified into an astonishing variety of ecological strategies. The Nemertea is a group of spiralians that exhibits a broad diversity of larval ... -
Evolutionary Implications of the microRNA- and piRNA Complement of Lepidodermella squamata (Gastrotricha)
Fromm, Bastian; Tosar, Juan Pablo; Aguilera, Felipe; Friedlaender, Marc R.; Bachmann, Lutz; Hejnol, Andreas (Journal article; Peer reviewed, 2019-02-22)Gastrotrichs—’hairy bellies’—are microscopic free-living animals inhabiting marine and freshwater habitats. Based on morphological and early molecular analyses, gastrotrichs were placed close to nematodes, but recent ... -
Expression of segment polarity genes in brachiopods supports a non-segmental ancestral role of engrailed for bilaterians
Vellutini, Bruno Cossermelli; Hejnol, Andreas (Journal article; Peer reviewed, 2016-08-26)The diverse and complex developmental mechanisms of segmentation have been more thoroughly studied in arthropods, vertebrates and annelids—distantly related animals considered to be segmented. Far less is known about the ... -
Gene expression in bryozoan larvae suggest a fundamental importance of pre-patterned blastemic cells in the bryozoan life-cycle
Fuchs, Judith; Martindale, Mark Q.; Hejnol, Andreas (Peer reviewed; Journal article, 2011-06-06)Background: Bryozoa is a clade of aquatic protostomes. The bryozoan life cycle typically comprises a larval stage, which metamorphoses into a sessile adult that proliferates by asexual budding to form colonies. The homology ... -
Getting to the bottom of anal evolution
Hejnol, Andreas; Martin Duran, Jose Maria (Journal article; Peer reviewed, 2015-02-27)The digestive tract is an essential organ system that allows animals to efficiently digest food and take up nutrients to maintain growth and sustain the body. While some animal groups possess a sack-like gut, others possess ... -
Hox gene expression in postmetamorphic juveniles of the brachiopod Terebratalia transversa
Gasiorowski, Ludwik; Hejnol, Andreas (Journal article; Peer reviewed, 2019-01-08)Background: Hox genes encode a family of homeodomain containing transcription factors that are clustered together on chromosomes of many Bilateria. Some bilaterian lineages express these genes during embryogenesis in spatial ... -
Increased taxon sampling reveals thousands of hidden orthologs in flatworms
Martin Duran, Jose Maria; Ryan, Joseph Francis; Vellutini, Bruno Cossermelli; Pang, Kevin Scott; Hejnol, Andreas (Journal article; Peer reviewed, 2017)Gains and losses shape the gene complement of animal lineages and are a fundamental aspect of genomic evolution. Acquiring a comprehensive view of the evolution of gene repertoires is limited by the intrinsic limitations ...