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Related Concept Videos

Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Chromosome Structure02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...

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Associated Chromosome Trap for Identifying Long-range DNA Interactions
14:49

Associated Chromosome Trap for Identifying Long-range DNA Interactions

Published on: April 23, 2011

Chromosome kissing.

Giacomo Cavalli1

  • 1Institute of Human Genetics, CNRS, 141, rue de la Cardonille, 34396 Montpellier, France. Giacomo.Cavallli@igh.cnrs.fr

Current Opinion in Genetics & Development
|October 16, 2007
PubMed
Summary
This summary is machine-generated.

Chromosome territories in eukaryotic cells rarely mix, but "chromosome kissing" allows distant DNA regions to contact. These interactions, detected by new methods, influence gene expression and may cause rearrangements.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Eukaryotic chromosomes reside in distinct nuclear territories with limited intermingling.
  • Chromosome kissing, the contact between different chromosomal loci, has been observed.
  • These contacts can be incidental or possess regulatory functions.

Purpose of the Study:

  • To investigate the phenomenon of chromosome kissing and its implications.
  • To understand the mechanisms and functional significance of inter-chromosomal contacts.
  • To explore the role of chromosome kissing in gene regulation and chromosomal rearrangements.

Main Methods:

  • Utilized recent unbiased approaches to detect chromosome kissing events.
  • Analyzed chromatin folding patterns and locus-specific features.
  • Investigated the frequency and nature of cis and trans chromosomal contacts.

Main Results:

  • Chromatin folding favors cis contacts but allows for contacts with remote chromosomal regions and other chromosomes.
  • Chromosome kissing events are modulated by specific chromatin features.
  • Evidence suggests chromosome kissing plays roles in gene expression regulation.

Conclusions:

  • Chromosome kissing is a significant nuclear phenomenon with diverse origins and functions.
  • These interactions are crucial for understanding genome organization and function.
  • Chromosome kissing may contribute to the etiology of chromosomal rearrangements.