TY  - JOUR
A1  - Biltueva, Larisa S.
A1  - Prokopov, Dmitry Yu.
A1  - Romanenko, Svetlana A.
A1  - Interesova, Elena A.
A1  - Schartl, Manfred
A1  - Trifonov, Vladimir A.
T1  - Chromosome distribution of highly conserved tandemly arranged repetitive DNAs in the Siberian sturgeon (Acipenser baerii)
JF  - Genes
N2  - Polyploid genomes present a challenge for cytogenetic and genomic studies, due to the high number of similar size chromosomes and the simultaneous presence of hardly distinguishable paralogous elements. The karyotype of the Siberian sturgeon (Acipenser baerii) contains around 250 chromosomes and is remarkable for the presence of paralogs from two rounds of whole-genome duplications (WGD). In this study, we applied the sterlet-derived acipenserid satDNA-based whole chromosome-specific probes to analyze the Siberian sturgeon karyotype. We demonstrate that the last genome duplication event in the Siberian sturgeon was accompanied by the simultaneous expansion of several repetitive DNA families. Some of the repetitive probes serve as good cytogenetic markers distinguishing paralogous chromosomes and detecting ancestral syntenic regions, which underwent fusions and fissions. The tendency of minisatellite specificity for chromosome size groups previously observed in the sterlet genome is also visible in the Siberian sturgeon. We provide an initial physical chromosome map of the Siberian sturgeon genome supported by molecular markers. The application of these data will facilitate genomic studies in other recent polyploid sturgeon species.
KW  - Acipenser baerii
KW  - sturgeon karyotype
KW  - whole-genome duplication
KW  - paralogs
KW  - polyploidy
KW  - acipenserid minisatellite
KW  - satellite DNA
KW  - tandem repeats
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-219371
SN  - 2073-4425
VL  - 11
IS  - 11
ER  - 
TY  - JOUR
A1  - Zhang, Yonghong
A1  - Zheng, Lanlan
A1  - Zheng, Yan
A1  - Zhou, Chao
A1  - Huang, Ping
A1  - Xiao, Xiao
A1  - Zhao, Yongheng
A1  - Hao, Xincai
A1  - Hu, Zhubing
A1  - Chen, Qinhua
A1  - Li, Hongliang
A1  - Wang, Xuanbin
A1  - Fukushima, Kenji
A1  - Wang, Guodong
A1  - Li, Chen
T1  - Assembly and Annotation of a Draft Genome of the Medicinal Plant Polygonum cuspidatum
JF  - Frontiers in Plant Science
N2  - Polygonum cuspidatum (Japanese knotweed, also known as Huzhang in Chinese), a plant that produces bioactive components such as stilbenes and quinones, has long been recognized as important in traditional Chinese herbal medicine. To better understand the biological features of this plant and to gain genetic insight into the biosynthesis of its natural products, we assembled a draft genome of P. cuspidatum using Illumina sequencing technology. The draft genome is ca. 2.56 Gb long, with 71.54% of the genome annotated as transposable elements. Integrated gene prediction suggested that the P. cuspidatum genome encodes 55,075 functional genes, including 6,776 gene families that are conserved in the five eudicot species examined and 2,386 that are unique to P. cuspidatum. Among the functional genes identified, 4,753 are predicted to encode transcription factors. We traced the gene duplication history of P. cuspidatum and determined that it has undergone two whole-genome duplication events about 65 and 6.6 million years ago. Roots are considered the primary medicinal tissue, and transcriptome analysis identified 2,173 genes that were expressed at higher levels in roots compared to aboveground tissues. Detailed phylogenetic analysis demonstrated expansion of the gene family encoding stilbene synthase and chalcone synthase enzymes in the phenylpropanoid metabolic pathway, which is associated with the biosynthesis of resveratrol, a pharmacologically important stilbene. Analysis of the draft genome identified 7 abscisic acid and water deficit stress-induced protein-coding genes and 14 cysteine-rich transmembrane module genes predicted to be involved in stress responses. The draft de novo genome assembly produced in this study represents a valuable resource for the molecular characterization of medicinal compounds in P. cuspidatum, the improvement of this important medicinal plant, and the exploration of its abiotic stress resistance.
KW  - genome assembly
KW  - resveratrol biosynthesis
KW  - whole-genome duplication
KW  - medicinal plant
KW  - stress tolerance
KW  - Polygonum  cuspidatum
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-189279
SN  - 1664-462X
VL  - 10
ER  -