Teaching GuideTerm
Faculty of Science
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Grao en Bioloxía
 Subjects
  Xenética molecular
   Contents
Topic Sub-topic
1.- GENOME ORGANIZATION C-value paradox. Prokaryotic and eukaryotic genomes. Single-copy and repetitive DNA sequences. Gene families. Centromeres. Telomeres. Organelle genomes.
2.- DNA REPLICATION Semiconservative DNA replication: the Meselson and Stahl experiment. Modes of replication. Enzymology of the replication. DNA replication in Escherichia coli. DNA replication in eukaryotes. Telomere synthesis. Replication of mithocondrial and cloroplast DNA.
3.- SYNTHESIS AND PROCESSING OF RNA Clases of RNA. RNA polymerases. Promoters and transcriptional appartatus. Transcription in prokaryotes and eukaryotes: initiation, elongation and termination. Interrupted genes: exons and introns. Processing of eukaryotic pre-mRNA. Synthesis and processing of pre-rRNA. Synthesis and processing of pre-tRNA. RNA edition. Revision of gene concept.
4.- TRANSLATION The one gene-one enzyme hypothesis. The genetic code: characteristics and experiments to decipher the code. Initiation of translation. Elongation of the polypeptide chain. Termination of translation. Messenger RNA surveillance.
5.- MUTATION AND DNA REPAIR Molecular basis of spontaneous mutations: replication errors, unequal crossing over, spontaneous chemical changes. Molecular basis of induced mutations: chemical and physical agents. Repair mechanisms: direct reversal of damaged DNA, excision repair, postreplication repair, error-prone repair, repair of double-strand breaks.
6.- MOLECULAR MECHANISM OF GENETIC RECOMBINATION
The role of genetic recombination. Gene conversion. Models of homologous recombination: Holliday model and double-strand break model. Enzymes required for recombination. Site-specific recombination. Inmunoglobulin genes assemble by recombination.
7.- TRANSPOSABLE GENETIC ELEMENTS Transposable elements in prokaryotes: insertion sequences, composite transposons and noncomposite transposons. Replicative and non replicative transposition. Transposable elements in eukaryotes: transposons and retrotransposon. Evolutionary significance of transposable elements.
8.- RECOMBINANT DNA TECHNOLOGY Restriction enzymes. Cloning vectors. DNA libraries: construction and screening. Southern and northern blotting. Restriction maps. Sequencing. PCR. Site-directed mutagenesis.
9.- APPLICATIONS OF RECOMBINANT DNA TECHNOLOGY
Expression of eukaryotic genes in E. coli. DNA transfer to eukaryotic cells. Transgenic animals. Transgenic plants. Gene therapy. Molecular markers. DNA fingerprinting. Genetic diagnosis. Synthetic genomes.
10.- GENOMICS
Physical and genetic mapping. Whole genome sequencing. Genome annotation. DNA microarrays. Reverse Genetics. Comparative genomics. Metagenomics.
11.- REGULATION OF GENE EXPRESSION IN BACTERIA
Jacob and Monod’s operon model for the regulation of lac genes in E. coli. Positive control of the lac operon. The arabinose operon of E. coli: positive and negative control. The triptophan operon of E. coli: negative control and attenuation. Control by RNA molecules.
12.- REGULATION OF GENE EXPRESSION IN EUKARYOTES
Changes in chromatin structure. DNA metilation. Transcriptional control.
RNA processing control. Control of mRNA stability. Control at the level of translation. RNA interference. Epigenetics.
13.- GENETIC CONTROL OF DEVELOPMENT
Basic events of development. Drosophila development stages. Maternal-effect, segmentation and homeotic genes in Drososphila. Homeobox genes in other organisms. General aspects of Caenorhabditis elegans development. Genetic control of flower development in Arabidopsis.
PRACTICE 1: DNA EXTRACTION DNA extraction from Drosophila melanogaster and human cells. Agarose gel electrophoresis of DNA. DNA quantification.
PRACTICE 2: PCR PCR amplification of the locus PV92. Analysis of an insertion polymorphism of Alu sequences
PRACTICE 3: DOT-BLOT Nucleic acids hybridization: detection of microsatellite sequences by dot-blot
PRACTICE 4: BIOINFORMATICS. Database search and comparison of nucleic acid sequences. Primer design. Identification of ORFs.
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