NDLI: Characterization and prevalence of a circular mitochondrial plasmid in senescence-prone isolates of Neurospora intermedia

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Characterization and prevalence of a circular mitochondrial plasmid in senescence-prone isolates of Neurospora intermedia

Content Provider	Springer Nature Link
Author	D’Souza, Anthony D. Sultana, Shahana Maheshwari, Ramesh
Copyright Year	2005
Abstract	Genetic and molecular analyses of the phenomenon of senescence—i.e., irreversible loss of growth and reproductive potential upon subculturing—in Neurospora intermedia strain M1991-60A, collected from Maddur in southern India, showed the presence of plasmid pMaddur1, which is homologous to the senescence-inducing circular mitochondrial plasmid, pVarkud. Maternal inheritance of senescence in M1991-60A correlated to the formation of variant pMaddur1, its subsequent insertion into mitochondrial (mt)DNA and the accumulation of defective mtDNA with the pMaddur1insert. PCR-based analyses for similar plasmids in 147 natural isolates of Neurospora from Maddur showed that nearly 40% of the strains had pMaddur1 or pMaddur2 that shared 97–98% sequence homology with pVarkud and pMauriceville. Nearly 50% of the strains that harbored either pMaddur1 or pMaddur2, also contained a circular Varkud satellite plasmid (pVS). Size polymorphism maps to the cluster of PstI sites in the non-coding region. Whereas senescence of nearly 40% of N. intermedia strains may be due to pMaddur, the presence in seven strains of pVS but not pMaddur and the absence of either of these two plasmids in other senescence-prone isolates suggests yet undiscovered mechanisms of senescence in the Maddur strains.
Starting Page	182
Ending Page	193
Page Count	12
File Format	PDF
ISSN	01728083
Journal	Current Genetics
Volume Number	47
Issue Number	3
e-ISSN	14320983
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-02-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Senescence Neurospora Mitochondria Plasmids Circular retroplasmids pMaddur
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine

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