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StatusReference proteome
Proteinsi <p>Number of protein entries associated with this proteome: UniProtKB entries for regular proteomes or UniParc entries for redundant proteomes (<a href="/help/proteome_redundancy">more...</a>)</p> 23,552
Gene counti <p>This is the total number of unique genes found in the proteome set, algorithmically computed. For each gene, a single representative protein sequence is chosen from the proteome. Where possible, reviewed (Swiss-Prot) protein sequences are chosen as the representatives.</p> - Download one protein sequence per gene (FASTA)
Proteome IDi <p>The proteome identifier (UPID) is the unique identifier assigned to the set of proteins that constitute the <a href="">proteome</a>. It consists of the characters ‘UP’ followed by 9 digits, is stable across releases and can therefore be used to cite a UniProt proteome.<p><a href='/help/proteome_id' target='_top'>More...</a></p>UP000002279
Taxonomy9258 - Ornithorhynchus anatinus
Last modifiedNovember 5, 2019
Genome assembly and annotationi <p>Identifier for the genome assembly (<a href="">more...</a>)</p> from Ensembl full

The platypus and the echidna are the only extant examples of monotremes or egg-laying mammals. The platypus is very unusual in appearance, covered in thick brown waterproof fur similar to a mole, with a duck-like beak, beaver tail and otter feet. It weighs between 0.7-2.4kg and has an average length of 50cm. It uses its beak for electro-location of prey as it hunts for worms, larvae and shrimps on the riverbed, mostly at dusk/dawn and night. Its vision is thus, relatively poor. On land it lives in a burrow along the riverbank. Platypuses are unique to Australia although fossil relatives have been found in Argentina. Evolutionary studies suggest that monotremes diverged from the mammal line prior to placentals and marsupials.

The platypus has 10 pairs of sex (XY) chromosomes, and sex determination has significant features in common with the system of ZZ/ZW chromosomes found in birds. The platypus lays 1-3 reptile-like eggs which take around 10 days to hatch after developing in utero for about 28 days. The young suckle milk from grooves on the mother's abdomen as they have no teats. Platypuses represent an evolutionary link between mammals and birds and reptiles.

For the Ensembl build gene models were generated using sets of potential orthologs to genes from other mammalian species as well as chicken. The genome contains 1.9Gb with 21,698 protein-coding genes and 28,002 predicted transcripts.

Componentsi <p>Genomic components encoding the proteome</p>

Component nameGenome Accession(s)
Component representationProteins
Chromosome 1264
Chromosome 2371
Chromosome 3355
Chromosome 4407
Chromosome 5161
Chromosome 6114
Chromosome 7326
Chromosome 10123
Chromosome 1180
Chromosome 1297
Chromosome 1438
Chromosome 1542
Chromosome 1730
Chromosome 1844
Chromosome 2014
Chromosome X1310
Chromosome X217
Chromosome X326
Chromosome X5151


  1. "Genome analysis of the platypus reveals unique signatures of evolution."
    Warren W.C., Hillier L.W., Marshall Graves J.A., Birney E., Ponting C.P., Grutzner F., Belov K., Miller W., Clarke L., Chinwalla A.T., Yang S.P., Heger A., Locke D.P., Miethke P., Waters P.D., Veyrunes F., Fulton L., Fulton B.
    Wilson R.K.
    Nature 453:175-183(2008) [PubMed] [Europe PMC] [Abstract]
  2. "The mitochondrial genome of a monotreme--the platypus (Ornithorhynchus anatinus)."
    Janke A., Gemmell N.J., Feldmaier-Fuchs G., von Haeseler A., Paabo S.
    J. Mol. Evol. 42:153-159(1996) [PubMed] [Europe PMC] [Abstract]
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