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Describe the molecular composition and arrangement of the components in the nucleosome.
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Ch. 11 - Chromosome Structure and DNA Sequence Organization
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
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Klug 10th EditionCh. 11 - Chromosome Structure and DNA Sequence OrganizationProblema 10
Klug 10th EditionCh. 11 - Chromosome Structure and DNA Sequence OrganizationProblema 10Capitolo 11, Problema 10
Describe the transitions that occur as nucleosomes are coiled and folded, ultimately forming a chromatid.
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Begin by understanding that DNA is initially wrapped around histone proteins to form nucleosomes, which resemble 'beads on a string.' This is the first level of chromatin organization.
Next, recognize that these nucleosomes coil further into a 30 nm fiber, often described as a solenoid or zigzag structure, which compacts the DNA more tightly.
Then, the 30 nm fiber forms looped domains by attaching to a protein scaffold, creating loops that further condense the chromatin.
Following this, the looped domains themselves coil and fold into even higher-order structures, increasing the level of compaction necessary for chromosome formation.
Finally, these highly condensed and folded chromatin fibers form the visible chromatid, which is one half of a duplicated chromosome, ready for cell division.
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Nucleosome Structure
Nucleosomes are the fundamental units of chromatin, consisting of DNA wrapped around histone protein octamers. This structure compacts DNA and regulates its accessibility, serving as the first level of DNA packaging in the nucleus.
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07:10
Chromosome Structure
Chromatin Fiber Formation
Nucleosomes coil into a 30-nanometer chromatin fiber through interactions between histone tails and linker DNA. This secondary structure further compacts DNA and organizes it into a more condensed form, preparing it for higher-order folding.
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04:35Chromatin
Higher-Order Chromatin Folding into Chromatids
The 30-nanometer fiber loops and folds into larger loops attached to a protein scaffold, forming the highly condensed chromatid structure seen during mitosis. This hierarchical folding ensures efficient DNA segregation during cell division.
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04:35Chromatin
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