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  4. Organization of lin genes and IS6100 among different strains of hexachlorocyclohexane-degrading Sphingomonas paucimobilis: Evidence for horizontal gene transfer
 
research article

Organization of lin genes and IS6100 among different strains of hexachlorocyclohexane-degrading Sphingomonas paucimobilis: Evidence for horizontal gene transfer

Dogra, C.
•
Raina, V.
•
Pal, R.
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2004
Journal Of Bacteriology

The organization of lin genes and IS6100 was studied in three strains of Sphingomonas paucimobilis (1390A, Sp+, and UT26) which degraded hexachlorocyclohexane (HCH) isomers but which had been isolated at different geographical locations. DNA-DNA hybridization data revealed that most of the lin genes in these strains were associated with IS6100, an insertion sequence classified in the IS6 family and initially found in Mycobacterium fortuitum. Eleven, six, and five copies of IS6100 were detected in B90A, Sp+, and UT26, respectively. IS6100 elements in B90A were sequenced from five, one, and one regions of the genomes of 1390A, Sp+, and UT26, respectively, and were found to be identical. DNA-DNA hybridization and DNA sequencing of cosmid clones also revealed that S. paucimobilis B90A contains three and two copies of linX and linA, respectively, compared to only one copy of these genes in strains Sp+ and UT26. Although the copy number and the sequence of the remaining genes of the HCH degradative pathway (linB, linC, linD, and linE) were nearly the same in all strains, there were striking differences in the organization of the linA genes as a result of replacement of portions of DNA sequences by IS6100, which gave them a strange mosaic configuration. Spontaneous deletion of linD and linE from B90A and of IinA from Sp+ occurred and was associated either with deletion of a copy of IS6100 or changes in IS6100 profiles. The evidence gathered in this study, coupled with the observation that the G+C contents of the linA genes are lower than that of the remaining DNA sequence of S. paucimobilis, strongly suggests that all these strains acquired the linA gene through horizontal gene transfer mediated by IS6100. The association of IS6100 with the rest of the lin genes further suggests that IS6100 played a role in shaping the current lin gene organization.

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Type
research article
DOI
10.1128/JB.186.8.2225-2235.2004
Web of Science ID

WOS:000220673800001

Author(s)
Dogra, C.
Raina, V.
Pal, R.
Suar, M.
Lal, S.
Gartemann, K. H.
Holliger, C.  
van der Meer, J. R.
Lal, R.
Date Issued

2004

Published in
Journal Of Bacteriology
Volume

186

Issue

8

Start page

2225

End page

2235

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LBE  
Available on Infoscience
October 18, 2005
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/217866
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