Bigelowiella natans (Bigna1)

Bigelowiella natans Assembly and Gene Annotation

About the Bigelowiella natans genome

Bigelowiella natans belongs to the eukaryotic 'supergroup' Rhizaria and it is a chlorarachniophyte alga. The chlorarachniophyte alga still possess the nucleomorph, nucleus from the endosymbiotic event in a highly reduced and simplified form. Proteins that function in the plastid of Bigelowiella natans are encoded in 3 separate genomes: the nucleus, the nucleomorph, and the plastid itself. The B.natans genome help in better understanding of the secondary endosymbiotic event.


The nuclear genomes of B. natans is approximately 95 megabase pairs (Mb) in size. The genome was assembled by Joint Genome Institute (JGI) into 3736 contigs which are then assembled into 302 scaffolds. It is estimated to have 3.5% sequence bases in the gap.


The genome is gene rich with more than 21,000 predicted protein, 229 genes per Mbp scaffold. The average gene length is ~2800nt with average of 8.9 exon per gene. 86% of the genes have intron. 92%of the gene models have start and stop codons.


  1. Algal genomes reveal evolutionary mosaicism and the fate of nucleomorphs.
    Curtis BA, Tanifuji G, Burki F, Gruber A, Irimia M, Maruyama S, Arias MC, Ball SG, Gile GH, Hirakawa Y et al. 2012. Nature. 492:59-65.

Picture credit: Image courtesy of Dr. Geoff McFadden, University of Melbourne, Australia

More information

General information about this species can be found in Wikipedia.



AssemblyBigna1, INSDC Assembly GCA_000320545.1, Nov 2012
Database version100.1
Base Pairs94,701,163
Golden Path Length94,701,163
Genebuild byJGI
Genebuild methodImport
Data sourceJoint Genome Institute

Gene counts

Coding genes21,706
Non coding genes608
Small non coding genes608
Gene transcripts22,320

About this species