Gossypium arboreum (A2) 'ZB-1' genome ZSTU_v1

Overview
Analysis NameGossypium arboreum (A2) 'ZB-1' genome ZSTU_v1
MethodPacBio; Illumina NovaSeq; MECAT2 v. 1.0; SOAPdenovo v. 1.0 (MECAT2 v. 1.0; SOAPdenovo v. 1.0)
Source (v1)
Date performed2026-03-26

About the assembly

Recent advancements in plant regeneration and synthetic polyploid creation have been documented in Gossypium arboreum ZB-1. These developments make ZB-1 a potential model within the Gossypium genus for investigating gene function and polyploidy. This work generated the sequence and annotation of the ZB-1 genome. The contig-level genome was constructed using the PacBio high-fidelity reads, encompassing 81 contigs with an N50 length of 112.12 Mb. The Hi-C data assisted the construction of the chromosome-level genome, which consists of 13 pseudo-chromosomes and 39 un-anchored contigs, with a total length of about 1.67 Gb. Repetitive sequences accounted for about 69.7% of the genome in length. Based on ab initio and evidence-based prediction, we have identified 48,021 protein-coding genes in the ZB-1 genome. Comparative genomics analysis revealed conserved gene content and arrangement between ZB-1 and G. arboreum SXY1. The single nucleotide polymorphism occurrence rate between ZB-1 and SXY1 was about 0.54 per 1,000 nucleotides. This study enriched the genomic resources for further exploration into cotton regeneration and polyploidy mechanisms.

Table 1. Statistics of the Gossypium arboreum ZB-1 genome assembly

 Features  Metric
 Contig-level assembly
 Number of contigs  81
 Total length of contigs  1,667,622,968 bp
 Longest contig  149,263,857 bp
 Contig N50  112,123,399 bp (contig number = 7)
 Contig N60  97,033,785 bp (contig number = 9)
 Contig N70  63,206,004 bp (contig number = 11)
 Contig N80  53,605,035 bp (contig number = 14)
 Contig N90  41,967,933 bp (contig number = 17)
 Chromosome-level assembly
 Number of scaffolds  52
 Total length of scaffolds  1,667,433,246 bp
 Longest scaffold  149,494,948 bp
 Scaffold N50   137,589,794 bp (scaffold number = 6)
 Scaffold N60   125,121,100 bp (scaffold number = 8)
 Scaffold N70   124,213,643 bp (scaffold number = 9)
 Scaffold N80   117,719,896 bp (scaffold number = 10)
 Scaffold N90   102,940,630 bp (scaffold number = 12)
 GC content  35.30%

Publication

Sun R et al.,  Chromosome-level genome assembly and annotation of a potential model organism Gossypium arboreum ZB-1. Scientific Data. 2024 Jun 12;11(1):620.

 

Assembly

The chromosomes (pseudomolecules) and scaffolds for Gossypium arboreum (A2) 'ZB-1' genome. This file belongs to the ZSTU G. arboreum Assembly v1.0

Chromosomes & scaffolds (FASTA format) G.arboreum_ZSTU.fa.gz
Contact

Sun, Yu-Qiang; Yu, Dong-Liang

Functional Analysis

Functional annotation files for the Gossypium arboreum 'ZB-1' ZSTU v1.0.a1 protein sequences are available for download below. Protein sequences were analyzed using InterProScan v5.72 to assign InterPro domains and Gene Ontology (GO) terms. Pathway analysis was performed using the KEGG Automatic Annotation Server (KAAS) v2.1.

Downloads

Gene Ontology (GO) annotations (InterProScan) A2_ZSTU_ZB1_v1.0.a1_genes2GO.xlsx.gz
InterPro domain annotations (InterProScan) A2_ZSTU_ZB1_v1.0.a1_genes2IPR.xlsx.gz
KEGG Ortholog (KO) assignments A2_ZSTU_ZB1_v1.0.a1_KEGG_orthologs.xlsx.gz
Genes

The predicted gene model, their alignments and proteins etc. for Gossypium arboreum(A2) 'ZB-1' genome. These files belong to the ZSTU G. arboreum Assembly v1.0

Predicted gene models with exons (GFF3 format) G.arboreum_ZSTU.gff3.gz
Coding sequences, CDS (FASTA format) G.arboreum_ZSTU.cds.fa.gz
Protein sequences (FASTA format) G.arboreum_ZSTU.protein.fa.gz
* RNA sequences from genomic (FASTA format) G.arboreum_ZSTU.RNA.fa.gz
* Translated CDS sequences (FASTA format) G.arboreum_ZSTU.transCDS.fa.gz

*_cds_from_genomic.fna.gz & *_rna_from_genomic.fna.gz (info from the link of NCBI): 

FASTA sequences of individual features annotated on the genomic records. The sequences are based solely on the genome sequence and annotated feature at a particular location. They may differ from the product sequences found in the *_rna.fna.gz and *_protein.faa.gz files which may be based on transcript or other data sources and include mismatches, indels, or additional sequence not found at a particular genomic location.

Homology

Homology of the Gossypium arboreum 'ZB-1' ZSTU v1.0.a1 protein sequences was determined by pairwise sequence comparison using the BLASTp algorithm against various protein databases. An E-value cutoff of 10-6 was applied for Arabidopsis thaliana (Araport11, 2022-09), UniProtKB/Swiss-Prot (Release date: 2026-01-28), and UniProtKB/TrEMBL (Release date: 2026-01-28) databases. The best-hit reports are available for download in Excel format.

Protein Homologs

G. arboreum 'ZB-1' ZSTU Araport11 homologs (EXCEL) A2_ZSTU_ZB1_v1.0.a1_Araport11_homology.xlsx
G. arboreum 'ZB-1' ZSTU with Araport11 matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_Araport11_matches.fasta.gz
G. arboreum 'ZB-1' ZSTU without Araport11 matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_Araport11_no_matches.fasta.gz
G. arboreum 'ZB-1' ZSTU SwissProt homologs (EXCEL) A2_ZSTU_ZB1_v1.0.a1_SwissProt_homology.xlsx.gz
G. arboreum 'ZB-1' ZSTU with Swiss-Prot matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_SwissProt_matches.fasta.gz
G. arboreum 'ZB-1' ZSTU without Swiss-Prot matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_SwissProt_no_matches.fasta.gz
G. arboreum 'ZB-1' ZSTU TrEMBL homologs (EXCEL) A2_ZSTU_ZB1_v1.0.a1_TrEMBL_homology.xlsx.gz
G. arboreum 'ZB-1' ZSTU with TrEMBL matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_TrEMBL_matches.fasta.gz
G. arboreum 'ZB-1' ZSTU without TrEMBL matches (FASTA) A2_ZSTU_ZB1_v1.0.a1_TrEMBL_no_matches.fasta.gz
Markers
Marker alignments were performed by the CottonGen Team of the Main Bioinformatics Lab (WSU). The alignment tool 'BLAT' was used to map marker sequences from CottonGen to the Gossypium arboreum 'ZB-1' ZSTU v1.0 assembly. Markers required 90% identity over 97% of their length. For SSRs & RFLPs, gap size was restricted to 1000 bp or less with ewer than 2 gaps. For dbSNPs and indels, gap size was restricted to 2 bp with fewer than 2 gaps. The available files are in GFF3 format. Markers available in CottonGen are linked to JBrowse.
 
CottonGen SNP markers mapped to genome A2_ZSTU_ZB1_v1_SNP
CottonGen RFLP markers mapped to genome A2_ZSTU_ZB1_v1_RFLP
CottonGen SSR markers mapped to genome A2_ZSTU_ZB1_v1_SSR
CottonGen InDel markers mapped to genome A2_ZSTU_ZB1_v1_InDel