Ralf Janssen

Summary

Affiliation: Uppsala University
Country: Sweden

Publications

  1. Janssen R, Le Gouar M, Pechmann M, Poulin F, Bolognesi R, Schwager E, et al. Conservation, loss, and redeployment of Wnt ligands in protostomes: implications for understanding the evolution of segment formation. BMC Evol Biol. 2010;10:374 pubmed publisher
    ..This requires further analysis of the expression and function of these genes in a wider range of taxa...
  2. Janssen R, Damen W, Budd G. Expression of collier in the premandibular segment of myriapods: support for the traditional Atelocerata concept or a case of convergence?. BMC Evol Biol. 2011;11:50 pubmed publisher
    ....
  3. Janssen R, Eriksson B, Budd G, Akam M, Prpic N. Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan-arthropods. Evol Dev. 2010;12:363-72 pubmed publisher
    ..The reversed hth and exd patterns in chelicerates and myriapods are therefore an apomorphy for this group, the Myriochelata, lending support to the Myriochelata and Tetraconata clades in arthropod phylogeny. ..
  4. Janssen R, Damen W, Budd G. Expression of pair rule gene orthologs in the blastoderm of a myriapod: evidence for pair rule-like mechanisms?. BMC Dev Biol. 2012;12:15 pubmed publisher
    ..Despite the derived developmental modes, it appears more likely that conserved mechanisms can be found in anterior patterning...
  5. Janssen R. Diplosegmentation in the pill millipede Glomeris marginata is the result of dorsal fusion. Evol Dev. 2011;13:477-87 pubmed publisher
    ..If the former is the case, my work may provide an impressive example of Haeckel's recapitulation theory...
  6. Janssen R, Jorgensen M, Lagebro L, Budd G. Fate and nature of the onychophoran mouth-anus furrow and its contribution to the blastopore. Proc Biol Sci. 2015;282: pubmed publisher
    ..The new data from the onychophorans thus remove one of the key pieces of evidence for the amphistomy theory. Rather, in line with other recent results, it suggests that ancestral bilaterian development was deuterostomic. ..
  7. Janssen R, Budd G. Investigation of endoderm marker-genes during gastrulation and gut-development in the velvet worm Euperipatoides kanangrensis. Dev Biol. 2017;427:155-164 pubmed publisher
    ....
  8. Janssen R, Budd G, Damen W. Gene expression suggests conserved mechanisms patterning the heads of insects and myriapods. Dev Biol. 2011;357:64-72 pubmed publisher
    ..This finding implies that the anterior patterning mechanism already existed in the last common ancestor of insects and myriapods...
  9. Schwager E, Sharma P, Clarke T, Leite D, Wierschin T, Pechmann M, et al. The house spider genome reveals an ancient whole-genome duplication during arachnid evolution. BMC Biol. 2017;15:62 pubmed publisher
    ....

Detail Information

Publications9

  1. Janssen R, Le Gouar M, Pechmann M, Poulin F, Bolognesi R, Schwager E, et al. Conservation, loss, and redeployment of Wnt ligands in protostomes: implications for understanding the evolution of segment formation. BMC Evol Biol. 2010;10:374 pubmed publisher
    ..This requires further analysis of the expression and function of these genes in a wider range of taxa...
  2. Janssen R, Damen W, Budd G. Expression of collier in the premandibular segment of myriapods: support for the traditional Atelocerata concept or a case of convergence?. BMC Evol Biol. 2011;11:50 pubmed publisher
    ....
  3. Janssen R, Eriksson B, Budd G, Akam M, Prpic N. Gene expression patterns in an onychophoran reveal that regionalization predates limb segmentation in pan-arthropods. Evol Dev. 2010;12:363-72 pubmed publisher
    ..The reversed hth and exd patterns in chelicerates and myriapods are therefore an apomorphy for this group, the Myriochelata, lending support to the Myriochelata and Tetraconata clades in arthropod phylogeny. ..
  4. Janssen R, Damen W, Budd G. Expression of pair rule gene orthologs in the blastoderm of a myriapod: evidence for pair rule-like mechanisms?. BMC Dev Biol. 2012;12:15 pubmed publisher
    ..Despite the derived developmental modes, it appears more likely that conserved mechanisms can be found in anterior patterning...
  5. Janssen R. Diplosegmentation in the pill millipede Glomeris marginata is the result of dorsal fusion. Evol Dev. 2011;13:477-87 pubmed publisher
    ..If the former is the case, my work may provide an impressive example of Haeckel's recapitulation theory...
  6. Janssen R, Jorgensen M, Lagebro L, Budd G. Fate and nature of the onychophoran mouth-anus furrow and its contribution to the blastopore. Proc Biol Sci. 2015;282: pubmed publisher
    ..The new data from the onychophorans thus remove one of the key pieces of evidence for the amphistomy theory. Rather, in line with other recent results, it suggests that ancestral bilaterian development was deuterostomic. ..
  7. Janssen R, Budd G. Investigation of endoderm marker-genes during gastrulation and gut-development in the velvet worm Euperipatoides kanangrensis. Dev Biol. 2017;427:155-164 pubmed publisher
    ....
  8. Janssen R, Budd G, Damen W. Gene expression suggests conserved mechanisms patterning the heads of insects and myriapods. Dev Biol. 2011;357:64-72 pubmed publisher
    ..This finding implies that the anterior patterning mechanism already existed in the last common ancestor of insects and myriapods...
  9. Schwager E, Sharma P, Clarke T, Leite D, Wierschin T, Pechmann M, et al. The house spider genome reveals an ancient whole-genome duplication during arachnid evolution. BMC Biol. 2017;15:62 pubmed publisher
    ....