Complete Genome Sequence of the Soybean Symbiont Bradyrhizobium japonicum Strain USDA6T.
Complete Genome Sequence of the Soybean Symbiont Bradyrhizobium japonicum Strain USDA6T.
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DOI：
10.3390/genes2040763
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发表时间：
2011-10-28
期刊：
影响因子：
3.5
通讯作者：
Sato S
中科院分区：
文献类型：
--
作者：
Kaneko T;Maita H;Hirakawa H;Uchiike N;Minamisawa K;Watanabe A;Sato S
测定了大豆共生体日本慢生根瘤菌USDA6T的全基因组核苷酸序列。USDA6T基因组是一条长9,207,384 bp的单圆形染色体。基因组大小与另一种大豆共生体B. japonicum USDA110的基因组相似（9,105,828 bp）。对USDA6T和USDA110的全基因组序列进行比较，发现两个基因组的主要区域共线性，尽管它们之间存在较大的反转。在每个基因组的三个区域检测到显著高水平的序列保守性。这三个区域的基因构成和核苷酸序列特征表明它们可能来源于一个共生岛。一个祖先的大型共生岛，总大小约为860 kb，似乎已经被未知的大规模基因组重排分裂成这三个区域。导致这种情况的两个整合事件似乎是独立发生的，但通过类似的机制，在两个基因组中。
The complete nucleotide sequence of the genome of the soybean symbiont Bradyrhizobium japonicum strain USDA6T was determined. The genome of USDA6T is a single circular chromosome of 9,207,384 bp. The genome size is similar to that of the genome of another soybean symbiont, B. japonicum USDA110 (9,105,828 bp). Comparison of the whole-genome sequences of USDA6T and USDA110 showed colinearity of major regions in the two genomes, although a large inversion exists between them. A significantly high level of sequence conservation was detected in three regions on each genome. The gene constitution and nucleotide sequence features in these three regions indicate that they may have been derived from a symbiosis island. An ancestral, large symbiosis island, approximately 860 kb in total size, appears to have been split into these three regions by unknown large-scale genome rearrangements. The two integration events responsible for this appear to have taken place independently, but through comparable mechanisms, in both genomes.
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