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Chapitre 6
Réplication chez les procaryotes
DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to…
Réplication chez les eucaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity…
Paire de bases d'ADN
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a…
La fourche de réplication de l'ADN
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a…
Proofreading
Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA…
Synthèse du brin retardé
During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading…
ADN Hélicases et protéines de liaison à l'ADN simple brin
DNA unwinding enzyme helicases are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from…
Le Réplisome
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together…
Réparation des mésappariements
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires…
ADN Topoisomérases
Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These…
Télomère et Télomérase
In eukaryotic DNA replication, a single-stranded DNA fragment remains at the end of a chromosome after the removal of the final primer. This section…
Héritage extranucléaire
Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and…
Génome mitochondrial animal
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded,…
Comparaison des génomes mitochondriaux, chloroplastiques et procaryotiques
The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired…
Exportation de gènes mitochondriaux et chloroplastiques
A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have…
Kinetics of Lagging-strand DNA Synthesis <em>In Vitro</em> by the Bacteriophage T7 Replication Proteins
Here we provide protocols for the kinetic examination of lagging-strand DNA synthesis in vitro by the replication proteins of bacteriophage T7. The…
Telomere Length and Telomerase Activity; A Yin and Yang of Cell Senescence
Telomeres are repeating DNA sequences at the tip ends of the chromosomes that are diverse in length and in humans can reach a length of 15,000 base…
Proofreading and DNA Repair Assay Using Single Nucleotide Extension and MALDI-TOF Mass Spectrometry Analysis
The maintenance of the genome and its faithful replication is paramount for conserving genetic information. To assess high fidelity replication, we…

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