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Related Concept Videos

Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...
Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...

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Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing
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Genetic code prediction for metazoan mitochondria with GenDecoder.

Federico Abascal1, Rafael Zardoya, David Posada

  • 1Departamento de Genética, Bioquímica e Inmunología, Facultad de Biología, Universidad de Vigo, Vigo, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|April 21, 2009
PubMed
Summary
This summary is machine-generated.

Understanding genetic code variations is crucial for analyzing protein-coding genes. This study details a reliable method for characterizing variant genetic codes, particularly in metazoan mitochondrial genomes, using comparative sequence analysis.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Bioinformatics

Background:

  • Most organisms use a standard genetic code, but exceptions exist where codons have different meanings.
  • Characterizing an organism's genetic code is essential for accurate protein-coding gene analysis.
  • Metazoan mitochondrial genomes are particularly important due to frequent variant codes and use in evolutionary studies.

Purpose of the Study:

  • To describe the rationale behind the GenDecoder web server's method for genetic code characterization.
  • To provide a guide for using GenDecoder with worked examples.
  • To highlight potential challenges in genetic code analysis.

Main Methods:

  • Comparative sequence analysis of protein alignments to identify variant codon meanings.
  • Hypothesizing codon translation based on amino acid frequency at specific positions across taxa.
  • Implementation of the method in the GenDecoder web server.

Main Results:

  • The comparative sequence analysis method is reliable when sufficient taxa and positions are included.
  • GenDecoder provides a practical tool for genetic code characterization.
  • Potential issues in analysis were identified and will be discussed.

Conclusions:

  • Accurate genetic code characterization is vital for understanding gene function and evolution.
  • The GenDecoder method offers a robust approach to identifying variant genetic codes.
  • Awareness of potential analytical problems is key for reliable results.