scholarly journals Pérdida secundaria de la fotosíntesis: el caso de las algas incoloras y de algunos parásitos

2017 ◽  
pp. 59
Author(s):  
Emma Berta Gutiérrez-Cirios-Madrid
Keyword(s):  
Mitochondrial Dna ◽  
Plastid Dna ◽  
Mitochondrial Genes ◽  
Interesting Phenomenon ◽  
Secondary Loss ◽  
Photosynthetic Proteins ◽  
Energetic Demand

This review  pretends  to  illustrate a very interesting phenomenon  in  nature: the  secondary loss of the  photosynthetic function and its effects in chloroplast and mitochondrial  DNA. Here it is described how plastid  DNA has been reduced loosing those genes which encode for photosynthetic proteins. An example of the  mitochondrial DNA of a colouress alga is also explained. An hypothesis is proposed where the  number o f mitochondrial genes is maintained in  this  colourless organisms due to the energetic demand  on the organelle.

Limitations of Allotopic Expression of Mitochondrial Genes in Mammalian Cells

Genetics ◽  
2003 ◽  
Vol 165 (2) ◽  
pp. 707-720
Author(s):  
Jose Oca-Cossio ◽  
Lesley Kenyon ◽  
Huiling Hao ◽  
Carlos T Moraes
Keyword(s):  
Mitochondrial Dna ◽  
Mammalian Cells ◽  
Mitochondrial Genes ◽  
Terminal Segment ◽  
Universal Genetic Code ◽  
Apocytochrome B ◽  
Dna Mutations ◽  
C Terminus ◽  
Cytoplasmic Compartment ◽  
Allotopic Expression

Abstract The possibility of expressing mitochondrial DNA-coded genes in the nuclear-cytoplasmic compartment provides an attractive system for genetic treatment of mitochondrial disorders associated with mitochondrial DNA mutations. In theory, by recoding mitochondrial genes to adapt them to the universal genetic code and by adding a DNA sequence coding for a mitochondrial-targeting sequence, one could achieve correct localization of the gene product. Such transfer has occurred in nature, and certain species of algae and plants express a number of polypeptides that are commonly coded by mtDNA in the nuclear-cytoplasmic compartment. In the present study, allotopic expression of three different mtDNA-coded polypeptides (ATPase8, apocytochrome b, and ND4) into COS-7 and HeLa cells was analyzed. Among these, only ATPase8 was correctly expressed and localized to mitochondria. The full-length, as well as truncated forms, of apocytochrome b and ND4 decorated the periphery of mitochondria, but also aggregated in fiber-like structures containing tubulin and in some cases also vimentin. The addition of a hydrophilic tail (EGFP) to the C terminus of these polypeptides did not change their localization. Overexpression of molecular chaperones also did not have a significant effect in preventing aggregations. Allotopic expression of apocytochrome b and ND4 induced a loss of mitochondrial membrane potential in transfected cells, which can lead to cell death. Our observations suggest that only a subset of mitochondrial genes can be replaced allotopically. Analyses of the hydrophobic patterns of different polypeptides suggest that hydrophobicity of the N-terminal segment is the main determinant for the importability of peptides into mammalian mitochondria.

scholarly journals PERIPHERAL BLOOD MITOCHONDRIAL DNA ALTERATION DURING SYSTEMIC LUPUS NEPHRITIS

2021 ◽  
Vol 10 (19) ◽  
pp. 416-421
Author(s):  
Ruchi Upadhyay ◽  
Ratika Srivastava
Keyword(s):  
Mitochondrial Dna ◽  
Lupus Nephritis ◽  
Lupus Erythematosus ◽  
Peripheral Blood ◽  
Normal Subjects ◽  
Mitochondrial Genes ◽  
Systemic Lupus ◽  
Mt Dna ◽  
Mitochondrial Dna Copy Number ◽  
Genes Encoding

The investigation of mitochondrial DNA (Mt-DNA) alterations could impart light on the involvement of mitochondria in the pathophysiology of Systemic Lupus Erythematosus. The purpose of this study is to examine the peripheral blood mitochondrial DNA copy number variation in Lupus Nephritis patients and also to find out it’s correlation with amount of protein present in urine. The significant correlation could aid in the inspection of mitochondrial involvement, particularly in Lupus Nephritis. Two mitochondrial genes encoding MT-CYT and MT-TL1 were measured quantitatively by qRT-PCR in whole blood of 17 SLE patients and 15 healthy subjects with similar gender (female: male ratio) and age group. The amount of mitochondrial genes MT-CYT and MT-TL1 was 1.69 and 1.26 fold higher respectively in patients. The significantly higher amount of protein detected in lupus nephritis patients (129.4±116.4 mg/dl) in comparison to normal subjects (25.3 ±10.7 mg/dl). No significant correlation was established between Mt-DNA quantity and proteinuria. Alteration in mitochondrial genes reflects the possibilities of altered mitophagy or mitochondrial biosynthesis during SLE. These findings are required to be further validated by studying mitophagy and biogenesis during SLE in details.

scholarly journals Molecular phylogeny of the Taeniapterini (Diptera: Micropezidae) using nuclear and mitochondrial DNA, with a reclassification of the genus Taeniaptera Macquart

2015 ◽  
Vol 46 (5) ◽  
pp. 411-430 ◽  
Author(s):  
Morgan D. Jackson ◽  
Stephen A. Marshall ◽  
Jeffrey H. Skevington
Keyword(s):  
Mitochondrial Dna ◽  
Bayesian Inference ◽  
Molecular Phylogeny ◽  
Maximum Parsimony ◽  
New World ◽  
Molecular Data ◽  
Species Group ◽  
Mitochondrial Genes ◽  
Paraphyletic Group ◽  
Total Dna

DNA molecular data are used to generate a phylogeny for the micropezid subfamily Taeniapterinae. Thirty-two taeniapterine species were sampled, including 10 of the 20 New World genera recognized by Steyskal, as well as one genus formerly treated as a synonym of Poecilotylus Hennig (Hemichaeta Steyskal). Five species from the Micropezinae were included as outgroups. A total DNA dataset of 4705 bp, including mitochondrial genes (12S and cytochrome c oxidase I (COI)) and nuclear coding genes (wingless and CAD), was analysed using maximum parsimony and Bayesian inference. The genus Taeniaptera Macquart was found to be non-monophyletic with respect to the remainder of the Taeniapterini analysed here. Taeniaptera is restricted to the Taeniaptera trivittata Macquart species group, Mitromyia Cresson is resurrected to contain the Taeniaptera grata (Wulp) species group, and Paragrallomyia Hendel is resurrected to contain most species previously considered Taeniaptera. Poecilotylus is recognized as a paraphyletic group awaiting further research.

scholarly journals The Alterations in Mitochondrial DNA Copy Number and Nuclear-Encoded Mitochondrial Genes in Rat Brain Structures after Cocaine Self-Administration

2016 ◽  
Vol 54 (9) ◽  
pp. 7460-7470 ◽  
Author(s):  
Anna Sadakierska-Chudy ◽  
Agnieszka Kotarska ◽  
Małgorzata Frankowska ◽  
Joanna Jastrzębska ◽  
Karolina Wydra ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Rat Brain ◽  
Copy Number ◽  
Brain Structures ◽  
Mitochondrial Genes ◽  
Self Administration ◽  
Dna Copy Number ◽  
Mitochondrial Dna Copy Number

Inheritance of mitochondrial DNA in interspecific crosses of Piceaglauca and Piceaomorika

1996 ◽  
Vol 26 (3) ◽  
pp. 428-432 ◽  
Author(s):  
Andrew J. David ◽  
Daniel E. Keathley
Keyword(s):  
Mitochondrial Dna ◽  
Interspecific Hybrids ◽  
Maternal Inheritance ◽  
White Spruce ◽  
Mitochondrial Genes ◽  
Interspecific Crosses ◽  
Length Polymorphisms ◽  
Dna Restriction ◽  
Total Dna ◽  
Serbian Spruce

Fifteen interspecific hybrids of Serbian spruce (Piceaomorika (Panc) Purkyne) and white spruce (Piceaglauca (Moench) Voss) representing five separate crosses, including reciprocals, were used to demonstrate maternal inheritance of mitochondrial DNA. Total DNA was extracted from foliage samples of Serbian spruce (S), white spruce (W), and both S(♂) × W(♀) and W(♂) × S(♀) hybrids, digested and probed with one of two maize mitochondrial genes, ATPaseα or COXII. ATPaseα generated diagnostic Serbian and white spruce genotypes for all five enzymes tested, while COXII differentiated between the two species for four of five enzymes. Maternal inheritance was indicated in all hybrids for every diagnostic enzyme–probe combination. No paternal or nonparental bands were detected. A dilution experiment indicated that the Serbian and white spruce mitochondrial DNA restriction fragment length polymorphisms could be detected in as little as 60 and 500 ng of total DNA, respectively. It appears that the mechanism that controls the inheritance of mitochondria in Picea is still functional in wide interspecific crosses.

Nucleotide Sequence of a 28-kbp Portion of Rice Mitochondrial DNA: the Existence of Many Sequences That Correspond to Parts of Mitochondrial Genes in Intergenic Regions

1994 ◽  
Vol 35 (8) ◽  
pp. 1239-1244 ◽  
Author(s):  
Hiraku Itadani ◽  
Tatsuya Wakasugi ◽  
Mamoru Sugita ◽  
Masahiro Sugiura ◽  
Mikio Nakazono ◽  
...  
Keyword(s):  
Mitochondrial Dna ◽  
Nucleotide Sequence ◽  
Mitochondrial Genes ◽  
Intergenic Regions

scholarly journals Phylogenetic Analysis of Mitochondrial Genes of Malaysian Tupaia Reveals Composite Species in Tupaia Glis

2021 ◽  
Vol 3 (1) ◽  
pp. 197-203
Author(s):  
Jayaraj Vijaya Kumaran ◽  
Ahmad Sofiman Othman ◽  
Shahrul-Anuar Mohd Sah ◽  
Seri Intan Mokhtar
Keyword(s):  
Phylogenetic Analysis ◽  
Mitochondrial Dna ◽  
Dna Sequences ◽  
Phylogenetic Trees ◽  
Mitochondrial Genes ◽  
Peninsular Malaysia ◽  
Universal Primers ◽  
Cyt B ◽  
Southern Thailand ◽  
Tupaia Glis

Recent morphometric analysis on T. glis in Peninsular Malaysia indicates that there were more than one morphotypes in this species. Thus this study attempts to examine this phenomenon using mitochondrial DNA sequences of Cyt b and CO1 genes. A total of 74 DNA sequences for both genes were generated using available universal primers. Samples from Southern Thailand were found to be misidentified as T. glis when in fact these samples clustered with T. belangeri while one T. tana from Borneo was miss-identified as T. minor. The phylogenetic trees showed that there are at least one confirmed morphotype of Tupaia (new Tupaia sp.) that have yet to be described. The results also showed that the separation of T. glis morphotype 1 and 11 were visible in the combined genes tree, congruent with the morphometric phylogeny but had poor phylogenetic support.

Molecular phylogeny of the spoonbills (Aves: Threskiornithidae) based on mitochondrial DNA

Zootaxa ◽  
2010 ◽  
Vol 2603 (1) ◽  
pp. 53 ◽  
Author(s):  
R. TERRY CHESSER ◽  
CAROL K. L. YEUNG ◽  
CHENG-TE YAO ◽  
XIU-HUA TIAN ◽  
SHOU-HSIEN LI
Keyword(s):  
Mitochondrial Dna ◽  
Maximum Likelihood ◽  
Molecular Phylogeny ◽  
Phylogenetic Trees ◽  
Strong Support ◽  
Sister Group ◽  
Molecular Data ◽  
Mitochondrial Genes ◽  
Bayesian Analyses ◽  
Limited Sampling

Spoonbills (genus Platalea) are a small group of wading birds, generally considered to constitute the subfamily Plataleinae (Aves: Threskiornithidae). We reconstructed phylogenetic relationships among the six species of spoonbills using variation in sequences of the mitochondrial genes ND2 and cytochrome b (total 1796 bp). Topologies of phylogenetic trees reconstructed using maximum likelihood, maximum parsimony, and Bayesian analyses were virtually identical and supported monophyly of the spoonbills. Most relationships within Platalea received strong support: P. minor and P. regia were closely related sister species, P. leucorodia was sister to the minor-regia clade, and P. alba was sister to the minor-regia-leucorodia clade. Relationships of P. flavipes and P. ajaja were less well resolved: these species either formed a clade that was sister to the four-species clade, or were successive sisters to this clade. This phylogeny is consistent with ideas of relatedness derived from spoonbill morphology. Our limited sampling of the Threskiornithinae (ibises), the putative sister group to the spoonbills, indicated that this group is paraphyletic, in agreement with previous molecular data; this suggests that separation of the Threskiornithidae into subfamilies Plataleinae and Threskiornithinae may not be warranted.

scholarly journals Changes in DNA damage, molecular integrity, and copy number for plastid DNA and mitochondrial DNA during maize development

2014 ◽  
Vol 65 (22) ◽  
pp. 6425-6439 ◽  
Author(s):  
Rachana A. Kumar ◽  
Delene J. Oldenburg ◽  
Arnold J. Bendich
Keyword(s):  
Dna Damage ◽  
Mitochondrial Dna ◽  
Copy Number ◽  
Plastid Dna
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