The marine bacterium Pseudoalteromonas haloplanktis has a complex genome structure composed of two separate genetic units.

Abstract:

:The genome size of Pseudoalteromonas haloplanktis, a ubiquitous and easily cultured marine bacterium, was measured as a step toward estimating the genome complexity of marine bacterioplankton. To determine total genome size, we digested P. haloplanktis DNA with the restriction endonucleases Notl and Sfil, separated the fragments using pulsed-field gel electrophoresis (PFGE), and summed the sizes of the fragments. The P. haloplanktis genome was 3512 +/- 112 kb by Notl digestion and 3468 +/- 54.1 kb by Sfil digestion. P. haloplanktis is also shown to have a complex genome structure, composed of two large replicons of approximately 2700 and 800 kb. Three pieces of evidence support this conclusion: (1) Two separate bands are always seen in PFGE of undigested P. haloplanktis DNA; (2) restriction digests of the larger band are missing a band of approximately 650 kb compared with restriction digests of total genomic DNA; and (3) a 16S rDNA probe hybridized to the larger replicon but not to the smaller. To our knowledge, P. haloplanktis is the first marine bacterium shown to have a complex genome structure.

journal_name

Genome Res

journal_title

Genome research

authors

Lanoil BD,Ciuffetti LM,Giovannoni SJ

doi

10.1101/gr.6.12.1160

subject

Has Abstract

pub_date

1996-12-01 00:00:00

pages

1160-9

issue

12

eissn

1088-9051

issn

1549-5469

journal_volume

6

pub_type

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