rankingiorew.blogg.se - Platypus evolution records

The gestation period of the platypus probably lasts between 15 and 21 d ( Holland and Jackson 2002). The monotremes have features that place them definitively within the class Mammalia but are unique in laying eggs rather than Convergent evolution has repeatedly selected genes coding for proteinsĬontaining specific structural motifs as templates for venom molecules. Have evolved separately in the platypus and reptiles. Here we show that several venom components Trace the evolutionary origins of other components of platypus and reptile venom. Intriguingly, some species of snakesĪnd lizards also produce venoms containing similar molecules called crotamines and crotamine-like peptides. The OvDLP genes are locatedĪdjacent to the beta-defensins and share similar gene organization and peptide structures. We show that gene duplicationĪnd subsequent functional diversification of beta-defensins gave rise to these platypus OvDLPs. Platypus genome for the sequences of antimicrobial defensin genes, we identified three Ornithorhynchus venom defensin-like peptide (OvDLP) genes, which produce the major components of platypus venom. Provides a unique opportunity to unravel the evolutionary history of many of these interesting features. Through a bite, as do snakes and shrews, male platypuses have venomous spurs on each hind leg. It is a most remarkable mammal, not only because it lays eggs but also because it is venomous. When the platypus ( Ornithorhynchus anatinus) was first discovered, it was thought to be a taxidermist’s hoax, as it has a blend of mammalian and reptilian features. 9 Department of Zoology, University of Melbourne, Parkville, Victoria 3010 Australia.8 Centre for Reproduction and Development, Monash Institute of Medical Research, Clayton, Victoria 3168 Australia.Of Oxford, Oxford OX1 3QX, United Kingdom

7 Department of Human Physiology, Anatomy and Genetics, Medical Research Council (MRC) Functional Genetics Unit, University.6 Genome Sequencing Center, Washington University School of Medicine, St.University, Canberra, Australian Capital Territory 0200 Australia

5 Australian Research Council (ARC) Centre for Kangaroo Genomics, Research School of Biological Sciences, The Australian National.

4 Nanoscale Organisation and Dynamics Group, College of Health and Science, University of Western Sydney, Sydney, New South.

3 School of Molecular and Microbial Biosciences, University of Sydney, Sydney, New South Wales 2006, Australia.

2 Bioinformatics Division, The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3050, Australia.

1 Faculty of Veterinary Science, University of Sydney, Sydney, New South Wales 2006, Australia.