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根瘤菌属和土壤杆菌属中的重复DNA序列

Reiterated DNA sequences in Rhizobium and Agrobacterium spp.

作者信息

Flores M, González V, Brom S, Martínez E, Piñero D, Romero D, Dávila G, Palacios R

机构信息

Centro de Investigación sobre Fijación de Nitrógeno, Universidad Nacional Autónoma de México, Cuernay Morelos.

出版信息

J Bacteriol. 1987 Dec;169(12):5782-8. doi: 10.1128/jb.169.12.5782-5788.1987.

DOI:10.1128/jb.169.12.5782-5788.1987
PMID:3450286
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC214138/
Abstract

Repeated DNA sequences are a general characteristic of eucaryotic genomes. Although several examples of DNA reiteration have been found in procaryotic organisms, only in the case of the archaebacteria Halobacterium halobium and Halobacterium volcanii [C. Sapienza and W. F. Doolittle, Nature (London) 295:384-389, 1982], has DNA reiteration been reported as a common genomic feature. The genomes of two Rhizobium phaseoli strains, one Rhizobium meliloti strain, and one Agrobacterium tumefaciens strain were analyzed for the presence of repetitive DNA. Rhizobium and Agrobacterium spp. are closely related soil bacteria that interact with plants and that belong to the taxonomical family Rhizobiaceae. Rhizobium species establish a nitrogen-fixing symbiosis in the roots of legumes, whereas Agrobacterium species is a pathogen in different plants. The four strains revealed a large number of repeated DNA sequences. The family size was usually small, from 2 to 5 elements, but some presented more than 10 elements. Rhizobium and Agrobacterium spp. contain large plasmids in addition to the chromosomes. Analysis of the two Rhizobium strains indicated that DNA reiteration is not confined to the chromosome or to some plasmids but is a property of the whole genome.

摘要

重复DNA序列是真核生物基因组的一个普遍特征。虽然在原核生物中也发现了一些DNA重复的例子，但只有在嗜盐古菌盐生盐杆菌和火山嗜盐杆菌的情况下[C. 萨皮恩扎和W. F. 杜利特尔，《自然》（伦敦）295:384 - 389，1982]，DNA重复才被报道为一种常见的基因组特征。分析了两株菜豆根瘤菌、一株苜蓿根瘤菌和一株根癌土壤杆菌菌株的基因组中是否存在重复DNA。根瘤菌属和土壤杆菌属是与植物相互作用的密切相关的土壤细菌，属于根瘤菌科。根瘤菌在豆科植物的根中建立固氮共生关系，而土壤杆菌是不同植物中的病原体。这四株菌株显示出大量的重复DNA序列。家族大小通常较小，从2到5个元件，但有些含有超过10个元件。根瘤菌属和土壤杆菌属除了染色体外还含有大质粒。对两株根瘤菌菌株的分析表明，DNA重复并不局限于染色体或某些质粒，而是整个基因组的一个特性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/d93f84194af7/jbacter00202-0464-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/42acb85e62db/jbacter00202-0462-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/e5a0161ad4b7/jbacter00202-0463-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/d93f84194af7/jbacter00202-0464-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/42acb85e62db/jbacter00202-0462-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/e5a0161ad4b7/jbacter00202-0463-a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dcd6/214138/d93f84194af7/jbacter00202-0464-a.jpg

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