Ensembl mobile site help

Things to know when navigating the Ensembl mobile site

Search box

Use the search box at the top right of all Ensembl views to search for a gene, phenotype, sequence variant, and more.

Top navigation

Touch MENU button to open the main menu and touch again to close.

Touch MENU

Left hand side menu

Touch the left menu icon () or swipe right to open the side menu and touch anywhere outside the menu or touch the cross icon or swipe left to close.

The ? icon

Touch the icon to get help

And don't forget to send us your comments using the feedback link inside the main menu.

EnsemblEnsembl Home

Opossum assembly and gene annotation


The ASM229v1 assembly was submitted by The Genome Sequencing Platform, The Genome Assembly Team on May 2011. The assembly is on chromosome level, consisting of 72,811 contigs assembled into 5,137 scaffolds. From these sequences, 9 chromosomes have been built. The N50 size is the length such that 50% of the assembled genome lies in blocks of the N50 size or longer. The N50 length for the contigs is 107,990 while the scaffold N50 is 527,952,102.

Gene annotation

The gene annotation process was carried out using a combination of protein-to-genome alignments, annotation mapping from a suitable reference species and RNA-seq alignments (where RNA-seq data with appropriate meta data were publicly available). For each candidate gene region, a selection process was applied to choose the most appropriate set of transcripts based on evolutionary distance, experimental evidence for the source data and quality of the alignments.
Small ncRNAs were obtained using a combination of BLAST and Infernal/RNAfold.
Pseudogenes were calculated by looking at genes with a large percentage of non-biological introns (introns of <10bp), where the gene was covered in repeats, or where the gene was single exon and evidence of a functional multi-exon paralog was found elsewhere in the genome.
lincRNAs were generated via RNA-seq data where no evidence of protein homology or protein domains could be found in the transcript.

In accordance with the Fort Lauderdale Agreement, please check the publication status of the genome/assembly before publishing any genome-wide analyses using these data.

More information

General information about this species can be found in Wikipedia.



AssemblyASM229v1, INSDC Assembly GCA_000002295.1, Jan 2007
Base Pairs3,600,504,728
Golden Path Length3,600,504,728
Annotation providerEnsembl
Annotation methodFull genebuild
Genebuild startedJan 2019
Genebuild releasedApr 2007
Genebuild last updated/patchedMay 2019
Database version100.1

Gene counts

Coding genes21,384
Non coding genes12,735
Small non coding genes1,832
Long non coding genes10,869
Misc non coding genes34
Gene transcripts58,883


Genscan gene predictions43,478
Short Variants1,196,696

About this species