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Andreas Hejnol
University of Bergen
AnatomyBilateriaGeneticsEvolutionary biologyBiology
95Publications
31H-index
4,898Citations
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Publications 92
Newest
#1José M. Martín-Durán (University of Bergen)H-Index: 17
#2Bruno Cossermelli Vellutini (University of Bergen)H-Index: 10
Last. Wenjia Gu (QMUL: Queen Mary University of London)
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Animal genomes vary in size by orders of magnitude. While genome size expansion relates to transposable element mobilisation and polyploidisation, the causes and consequences of genome reduction are unclear. This is because our understanding of genome compaction relies on animals with extreme lifestyles, such as parasites, and free-living animals with exceptionally high rates of evolution. Here, we decode the extremely compact genome of the annelid Dimorphilus gyrociliatus, a morphologically min...
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#1Ludwik Gąsiorowski (University of Bergen)H-Index: 1
#1L. Gasiorowski (University of Bergen)
Last. Andreas Hejnol (University of Bergen)H-Index: 31
view all 2 authors...
Background: Phoronida is a small group of marine worm-like suspension feeders, which together with brachiopods and bryozoans form the clade Lophophorata. Although their development is well studied on the morphological level, data regarding gene expression during this process are scarce and restricted to the analysis of relatively few transcription factors. Here, we present a description of the expression patterns of Hox genes during the embryonic and larval development of the phoronid Phoronopsi...
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#1José M. Martín-Durán (University of Bergen)H-Index: 17
#2Andreas Hejnol (University of Bergen)H-Index: 31
Abstract The evolution of nervous systems in animals has always fascinated biologists, and thus multiple evolutionary scenarios have been proposed to explain the appearance of neurons and complex neuronal centers. However, the absence of a robust phylogenetic framework for animal interrelationships, the lack of a mechanistic understanding of development, and a recapitulative view of animal ontogeny have traditionally limited these scenarios. Only recently, the integration of advanced molecular a...
1 CitationsSource
#1Ludwik Gąsiorowski (University of Bergen)H-Index: 1
#1Ludwik Gasiorowski (University of Bergen)
Last. Andreas Hejnol (University of Bergen)H-Index: 31
view all 2 authors...
Background: Phoronida is a small group of marine worm-like suspension feeders, which together with brachiopods and bryozoans form the clade Lophophorata. Although their development is well studied on the morphological level, data regarding gene expression during this process are scarce and restricted to the analysis of relatively few transcription factors. Here we present a description of the expression patterns of Hox genes during the embryonic and larval development of the phoronid Phoronopsis...
1 CitationsSource
#1Carmen Andrikou (University of Bergen)H-Index: 1
#1Carmen Andrikou (University of Bergen)H-Index: 5
Last. Andreas Hejnol (University of Bergen)H-Index: 31
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Background: Answering the question how conserved patterning systems are across evolutionary lineages requires a broad taxon sampling. Phoronid development has previously been studied using fate mapping and morphogenesis, yet molecular descriptions are missing. Here we report the expression patterns of the evolutionarily conserved anterior (otx, gsc, six3/6, nk2.1), posterior (cdx, bra) and endomesodermal (foxA, gata4/5/6, twist) markers in the phoronid Phoronopsis harmeri. Results: The transcrip...
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#1Alex de Mendoza (UWA: University of Western Australia)H-Index: 13
#2William L. Hatleberg (UQ: University of Queensland)H-Index: 4
Last. Ryan Lister (UWA: University of Western Australia)H-Index: 40
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Vertebrates have highly methylated genomes at CpG positions, whereas invertebrates have sparsely methylated genomes. This increase in methylation content is considered a major regulatory innovation of vertebrate genomes. However, here we report that a sponge, proposed as the potential sister group to the rest of animals, has a highly methylated genome. Despite major differences in genome size and architecture, we find similarities between the independent acquisitions of the hypermethylated state...
4 CitationsSource
#1Ludwik Gąsiorowski (University of Bergen)H-Index: 2
#1Ludwik Gąsiorowski (University of Bergen)H-Index: 1
Last. Andreas Hejnol (University of Bergen)H-Index: 31
view all 3 authors...
Monogononta is a large clade of rotifers comprised of diverse morphological forms found in a wide range of ecological habitats. Most monogonont species display cyclical parthenogenesis, where generations of asexually reproducing females are interspaced by mixis events when sexual reproduction occurs between mictic females and dwarf, haploid males. The morphology of monogonont feeding females is relatively well described, however data on male anatomy are very limited. Thus far, male musculature o...
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#1Carmen Andrikou (University of Bergen)H-Index: 5
#1Carmen Andrikou (University of Bergen)H-Index: 1
Last. Andreas Hejnol (University of Bergen)H-Index: 31
view all 4 authors...
Most bilaterian animals excrete toxic metabolites through specialized organs, such as nephridia and kidneys, which share morphological and functional correspondences. In contrast, the excretory mechanisms in non-nephrozoans are largely unknown, and therefore the reconstruction of ancestral excretory mechanisms is problematic. Here, we investigated the excretory mode of members of the Xenacoelomorpha, the sister group to Nephrozoa, and Cnidaria, the sister group to Bilateria. By combining gene ex...
3 CitationsSource
#1Daniel Thiel (University of Bergen)H-Index: 5
#2Philipp Bauknecht (MPG: Max Planck Society)H-Index: 4
Last. Andreas Hejnol (University of Bergen)H-Index: 31
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The trochozoan excitatory peptide (EP) and its ortholog, the arthropod CCHamide, are neuropeptides that are only investigated in very few animal species. Previous studies on different trochozoan species focused on their physiological effect in adult specimens, demonstrating a myo-excitatory effect, often on tissues of the digestive system. The function of EP in the planktonic larvae of trochozoans has not yet been studied. We surveyed transcriptomes from species of various spiralian (Orthonectid...
1 CitationsSource
#1Mattias Hogvall (Uppsala University)H-Index: 2
#2Bruno Cossermelli Vellutini (University of Bergen)H-Index: 10
Last. Ralf Janssen (Uppsala University)H-Index: 22
view all 6 authors...
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 to specific receptors on neighbouring cells and thereby establish cell-to-cell communication. In segmented animals such as annelids and arthropods, Wnt signalling is also likely involved in segment border formation and regionalisation of the segments. Priapulids represent uns...
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