Ralf Janssen

Publications

Recent publications

• New insights into mesoderm and endoderm development, and the nature of the onychophoran blastopore (2024)
• Single-cell RNA sequencing of mid-to-late stage spider embryos (2024)
• Hox genes in spiders (2024)
• Evolution of the Spider Homeobox Gene Repertoire by Tandem and Whole Genome Duplication (2023)
• Comment on "The lower Cambrian lobopodian Cardiodictyon resolves the origin of euarthropod brains" (2023)

All publications

Articles

• New insights into mesoderm and endoderm development, and the nature of the onychophoran blastopore (2024)
• Single-cell RNA sequencing of mid-to-late stage spider embryos (2024)
• Hox genes in spiders (2024)
• Evolution of the Spider Homeobox Gene Repertoire by Tandem and Whole Genome Duplication (2023)
• Comment on "The lower Cambrian lobopodian Cardiodictyon resolves the origin of euarthropod brains" (2023)
• Expression of netrin and its receptors uncoordinated-5 and frazzled in arthropods and onychophorans suggests conserved and diverged functions in neuronal pathfinding and synaptogenesis (2023)
• Expression of posterior Hox genes and opisthosomal appendage development in a mygalomorph spider (2023)
• Embryonic expression patterns of Wnt genes in the RTA-clade spider Cupiennius salei (2022)
• A comprehensive study of arthropod and onychophoran Fox gene expression patterns (2022)
• Lack of evidence for conserved parasegmental grooves in arthropods (2022)
• Phylogenetic analysis of forkhead transcription factors in the Panarthropoda (2022)
• Review of extra-embryonic tissues in the closest arthropod relatives, onychophorans and tardigrades (2022)
• Molecular evidence for a single origin of ultrafiltration-based excretory organs (2021)
• Widespread retention of ohnologs in key developmental gene families following whole-genome duplication in arachnopulmonates (2021)
• Oscillating waves of Fox, Cyclin and CDK gene expression indicate unique spatiotemporal control of cell cycling during nervous system development in onychophorans (2021)
• A chelicerate Wnt gene expression atlas (2021)
• Panarthropod tiptop/teashirt and spalt orthologs and their potential role as "trunk"-selector genes (2021)
• The forkhead box containing transcription factor FoxB is a potential component of dorsal-ventral body axis formation in the spider Parasteatoda tepidariorum (2020)
• The embryonic expression pattern of a second, hitherto unrecognized, paralog of the pair-rule gene sloppy-paired in the beetle Tribolium castaneum (2020)
• Expression of the zinc finger transcription factor Sp6-9 in the velvet worm Euperipatoides kanangrensis suggests a conserved role in appendage development in Panarthropoda (2020)
• FoxB, a new and highly conserved key factor in arthropod dorsal-ventral (DV) limb patterning (2019)
• Embryonic expression of priapulid Wnt genes (2019)
• The last common ancestor of Ecdysozoa had an adult terminal mouth (2019)
• Phylogenetic analysis and embryonic expression of panarthropod Dmrt genes (2019)
• Gene expression analysis of potential morphogen signalling modifying factors in Panarthropoda (2018)
• Embryonic expression patterns and phylogenetic analysis of panarthropod sox genes (2018)
• Embryonic expression of a Long Toll (Loto) gene in the onychophorans Euperipatoides kanangrensis and Cephalofovea clandestina (2018)
• Gene expression reveals evidence for EGFR-dependent proximal-distal limb patterning in a myriapod (2017)
• A molecular view of onychophoran segmentation (2017)
• Comparative analysis of gene expression patterns in the arthropod labrum and the onychophoran frontal appendages, and its implications for the arthropod head problem (2017)
• Investigation of endoderm marker-genes during gastrulation and gut-development in the velvet worm Euperipatoides kanangrensis (2017)
• Origin and Evolution of the Panarthropod Head - a Deep Time Perspective (2017)
• Origin and evolution of the panarthropod head (2017)
• The house spider genome reveals an ancient whole-genome duplication during arachnid evolution (2017)
• Gene expression analysis reveals that Delta/Notch signalling is not involved in onychophoran segmentation (2016)
• Fate and nature of the onychophoran mouth-anus furrow and its contribution to the blastopore (2015)
• Aspects of dorso-ventral and proximo-distal limb patterning in onychophorans (2015)
• The evolution and expression of panarthropod frizzled genes (2015)
• Analysis of the Wnt gene repertoire in an onychophoran provides new insights into the evolution of segmentation (2014)
• Gene expression suggests double-segmental and single-segmental patterning mechanisms during posterior segment addition in the beetle Tribolium castaneum (2014)
• Onychophoran Hox genes and the evolution of arthropod Hox gene expression (2014)
• Identification and embryonic expression of Wnt2, Wnt4, Wnt5 and Wnt9 in the millipede Glomeris marginata (Myriapoda: Diplopoda) (2014)
• Expression of arthropod distal limb-patterning genes in the onychophoran Euperipatoides kanangrensis (2014)
• A curious abnormally developed embryo of the pill millipede Glomeris marginata (Villers, 1789) (2013)
• Developmental abnormalities in Glomeris marginata (Villers 1789) (Myriapoda: Diplopoda) (2013)
• Deciphering the onychophoran 'segmentation gene cascade' (2013)
• Segment polarity gene expression in a myriapod reveals conserved and diverged aspects of early head patterning in arthropods (2012)
• Expression of pair rule gene orthologs in the blastoderm of a myriapod (2012)
• Deuterostomic Development in the Protostome Priapulus caudatus (2012)
• Diplosegmentation in the pill millipede Glomeris marginata is the result of dorsal fusion (2011)
• An abnormally developed embryo of the pill millipede Glomeris marginata that lacks dorsal segmental derivatives (2011)
• Gene expression suggests conserved mechanisms patterning the heads of insects and myriapods (2011)
• Expression of myriapod pair rule gene orthologs (2011)
• Expression of collier in the premandibular segment of myriapods (2011)
• Head patterning and Hox gene expression in an onychophoran and its implications for the arthropod head problem (2010)
• Gene expression suggests conserved aspects of Hox gene regulation in arthropods and provides additional support for monophyletic Myriapoda (2010)
• Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan-arthropods (2010)
• Conservation, loss, and redeployment of Wnt ligands in protostomes (2010)
• Genome Sequence of the Pea Aphid Acyrthosiphon pisum (2010)
• Comprehensive survey of developmental genes in the pea aphid, Acyrthosiphon pisum (2010)
• Embryonic development and the understanding of the adult body plan in myriapods (2009)
• The hatching larva of the priapulid worm Halicryptus spinulosus (2009)
• Hatching and earliest larval stages of the priapulid worm Priapulus caudatus (2009)
• Evidence for Wg-independent tergite boundary formation in the millipede Glomeris marginata (2008)
• Diverged and conserved aspects of heart formation in a spider (2008)
• The T-box genes H15 and optomotor-blind in the spiders Cupiennius salei, Tegenaria atrica and Achaearanea tepidariorum and the dorsoventral axis of arthropod appendages (2008)
• Early embryonic development of the priapulid worm Priapulus caudatus (2008)
• The ten Hox genes of the millipede Glomeris marginata (2006)
• Dorso-ventral differences in gene expression in Glomeris marginata Villers, 1789 (Myriapoda: Diplopoda) (2006)
• A review of the correlation of tergites, sternites, and leg pairs in diplopods (2006)
• Pair rule gene orthologs in spider segmentation (2005)
• Evolution of dorsal–ventral axis formation in arthropod appendages (2005)
• Gene expression suggests decoupled dorsal and ventral segmentation in the millipede Glomeris marginata (Myriapoda: Diplopoda) (2004)
• Gene expression in spider appendages reveals reversal of exd/hth spatial specificity, altered leg gap gene dynamics, and suggests divergent distal morphogen signaling (2003)
• A simple dissociation protocol for single-cell RNA sequencing of spider embryos
• Single-cell sequencing reveals novel insights into spider eye development