Linear mitochondrial genome organization in vivo in the genus Pythium

1995 ◽  
Vol 28 (3) ◽  
pp. 225-234 ◽  
Author(s):  
Frank N. Martin
Keyword(s):  
Mitochondrial Genome ◽  
Genome Organization ◽  
Genus Pythium ◽  
Linear Mitochondrial Genome

scholarly journals Frequent tRNA gene translocation towards the boundaries with control regions contributes to the highly dynamic mitochondrial genome organization of the parasitic lice of mammals

BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Wen-Ge Dong ◽  
Yalun Dong ◽  
Xian-Guo Guo ◽  
Renfu Shao
Keyword(s):  
Mitochondrial Genome ◽  
Control Region ◽  
Genome Organization ◽  
Trna Gene ◽  
Trna Genes ◽  
Single Chromosome ◽  
Gene Translocation ◽  
Sucking Lice ◽  
Different Types ◽  
Mt Genome

Abstract Background The typical single-chromosome mitochondrial (mt) genome of animals has fragmented into multiple minichromosomes in the lineage Mitodivisia, which contains most of the parasitic lice of eutherian mammals. These parasitic lice differ from each other even among congeneric species in mt karyotype, i.e. the number of minichromosomes, and the gene content and gene order in each minichromosome, which is in stark contrast to the extremely conserved single-chromosome mt genomes across most animal lineages. How fragmented mt genomes evolved is still poorly understood. We use Polyplax sucking lice as a model to investigate how tRNA gene translocation shapes the dynamic mt karyotypes. Results We sequenced the full mt genome of the Asian grey shrew louse, Polyplax reclinata. We then inferred the ancestral mt karyotype for Polyplax lice and compared it with the mt karyotypes of the three Polyplax species sequenced to date. We found that tRNA genes were entirely responsible for mt karyotype variation among these three species of Polyplax lice. Furthermore, tRNA gene translocation observed in Polyplax lice was only between different types of minichromosomes and towards the boundaries with the control region. A similar pattern of tRNA gene translocation can also been seen in other sucking lice with fragmented mt genomes. Conclusions We conclude that inter-minichromosomal tRNA gene translocation orientated towards the boundaries with the control region is a major contributing factor to the highly dynamic mitochondrial genome organization in the parasitic lice of mammals.

scholarly journals The linear mitochondrial genome of commensal hydroid Eutima japonica (Cnidaria, Hydrozoa, Eirenidae)

2021 ◽  
Vol 6 (3) ◽  
pp. 1082-1084
Author(s):  
Jung Soo Seo ◽  
Hey-Jin Eom ◽  
Jae-Kwon Cho ◽  
Hyun-Sil Kang ◽  
Jae-Sung Rhee
Keyword(s):  
Mitochondrial Genome ◽  
Linear Mitochondrial Genome

The mitochondrial genome organization of a maize fertile cmsT revertant line is generated through recombination between two sets of repeats.

Genetics ◽  
1990 ◽  
Vol 124 (2) ◽  
pp. 423-428 ◽  
Author(s):  
C M Fauron ◽  
M Havlik ◽  
R I Brettell
Keyword(s):  
Mitochondrial Genome ◽  
Genome Organization ◽  
Callus Tissue ◽  
Mitochondrial Genomes ◽  
Normal Type ◽  
Male Sterile ◽  
Sequence Complexity ◽  
Mtdna Organization ◽  
Callus Tissue Culture ◽  
Fertile Revertant

Abstract The mitochondrial genome (mtDNA) organization from a fertile revertant line (V3) derived from the maize cytoplasmic male sterile type T (cmsT) callus tissue culture has been determined. We report that the sequence complexity can be mapped on to a circular "master chromosome" of 705 kb which includes a duplication of 165 kb of DNA when compared to its male sterile progenitor. Associated with this event is also a 0.423-kb deletion, which removed the cmsT-associated urf13 gene. As found for the maize normal type (N) and cmsT mitochondrial genomes, the V3 master chromosome also exists as a multipartite structure generated by recombination through repeated sequences.

Complete mitochondrial genome organization ofSchizothorax plagiostomus(Heckel, 1838)

2014 ◽  
Vol 27 (1) ◽  
pp. 113-114 ◽  
Author(s):  
Chirag Goel ◽  
Prabhati Kumari Sahoo ◽  
Ashoktaru Barat
Keyword(s):  
Mitochondrial Genome ◽  
Genome Organization ◽  
Complete Mitochondrial Genome

scholarly journals Hyaloraphidium curvatum: A Linear Mitochondrial Genome, tRNA Editing, and an Evolutionary Link to Lower Fungi

2002 ◽  
Vol 19 (3) ◽  
pp. 310-319 ◽  
Author(s):  
Lise Forget ◽  
Jana Ustinova ◽  
Zhang Wang ◽  
Volker A. R. Huss ◽  
B. Franz Lang
Keyword(s):  
Mitochondrial Genome ◽  
Linear Mitochondrial Genome ◽  
Trna Editing

scholarly journals Mitochondrial Development during Life Cycle Differentiation of African Trypanosomes: Evidence for a Kinetoplast-dependent Differentiation Control Point

2002 ◽  
Vol 13 (10) ◽  
pp. 3747-3759 ◽  
Author(s):  
Mark W. Timms ◽  
Frederick J. van Deursen ◽  
Edward F. Hendriks ◽  
Keith R. Matthews
Keyword(s):  
Life Cycle ◽  
Rna Interference ◽  
Mitochondrial Genome ◽  
Topoisomerase Ii ◽  
Developmental Regulation ◽  
Control Point ◽  
Nuclear Genome ◽  
Mitochondrial Activity ◽  
African Trypanosomes

Life cycle differentiation of African trypanosomes entails developmental regulation of mitochondrial activity. This requires regulation of the nuclear genome and the kinetoplast, the trypanosome's unusual mitochondrial genome. To investigate the potential cross talk between the nuclear and mitochondrial genome during the events of differentiation, we have 1) disrupted expression of a nuclear-encoded component of the cytochrome oxidase (COX) complex; and 2) generated dyskinetoplastid cells, which lack a mitochondrial genome. Using RNA interference (RNAi) and by disrupting the nuclear COX VI gene, we demonstrate independent regulation of COX component mRNAs encoded in the nucleus and kinetoplast. However, two independent approaches (acriflavine treatment and RNA interference ablation of mitochondrial topoisomerase II) failed to establish clonal lines of dyskinetoplastid bloodstream forms. Nevertheless, dyskinetoplastid forms generated in vivo could undergo two life cycle differentiation events: transition from bloodstream slender to stumpy forms and the initiation of transformation to procyclic forms. However, they subsequently arrested at a specific point in this developmental program before cell cycle reentry. These results provide strong evidence for a requirement for kinetoplast DNA in the bloodstream and for a kinetoplast-dependent control point during differentiation to procyclic forms.

Sign in / Sign up

Export Citation Format

Share Document