Meiotic Arm Cohesion
Meiotic Arm Cohesion - Related Videos
01:07
Cohesion
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2019
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature. On a surface,...
12:49
Measurement of Aggregate Cohesion by Tissue Surface Tensiometry
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Cited by 10 •
2011
We describe a method of measuring binding energy, expressible as tissue surface tension, between cells within 3D tissue-like aggregates. Differences in tissue surface tension have been demonstrated to correlate with invasiveness of lung, muscle, and brain tumors, and are fundamental determinants of establishing spatial relationships between different cell types.
12:46
Using Fluorescence In Situ Hybridization (FISH) to Monitor the State of Arm Cohesion in Prometaphase and Metaphase I Drosophila Oocytes
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Cited by 7 •
2017
This manuscript presents a detailed method for generating X-chromosome arm probes and performing fluorescence in situ hybridization (FISH) to examine the state of sister chromatid cohesion in prometaphase and metaphase I arrested Drosophila oocytes. This protocol is suitable for determining whether meiotic arm cohesion is intact or disrupted in different genotypes.
06:38
Preparation of Meiotic Chromosome Spreads from Mouse Spermatocytes
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Cited by 27 •
2017
Meiosis is the developmental process by which gametes are formed through a single round of DNA replication and two successive rounds of chromosome segregation. Mammalian meiosis can be examined by utilizing a technique to prepare meiotic chromosome spreads. Here, we demonstrate a method of preparing surface-spread nuclei from mouse spermatocytes.
07:18
Live Imaging Characterization of Centromere Movements During Male Meiotic Prophase in Arabidopsis thaliana
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2025
Chromosome movement during meiotic prophase is a poorly understood phenomenon that is fundamental to spore formation. This protocol describes a method to acquire, analyze, and quantify centromere movements during meiotic prophase in Arabidopsis thaliana male meiocytes.
FAQs
Rec8 forms part of the meiosis-specific cohesin complexes that establish sister-chromatid attachment along chromosome arms. This cohesion is maintained while chromosomes pair and recombine, helping preserve the physical organization needed for stable connections between homologous chromosomes. Its activity therefore links early chromosome behavior with the later accuracy of homolog segregation at the first meiotic division.
Staged removal separates homologous chromosomes during anaphase I while retaining sister-chromatid attachment near centromeres until meiosis II. If cohesion disappeared everywhere simultaneously, sister chromatids could separate prematurely. The sequence therefore supports the reduction in chromosome number during meiosis I and preserves the organization required for the second division.
Arm cohesion is released at anaphase I, allowing homologous chromosomes to move apart, whereas cohesion near centromeres is protected until meiosis II. These regions consequently make different contributions to chromosome inheritance: arm cohesion supports the first division’s separation of homologs, while centromeric protection maintains sister-chromatid attachment for the later division.
Proper arm cohesion helps maintain chromosome associations through pairing and recombination and supports the controlled separation of homologs at anaphase I. When this coordination fails, chromosomes may not segregate accurately, producing nondisjunction. Because nondisjunction is a major source of aneuploidy, studying arm cohesion provides a mechanistic route for understanding abnormal chromosome-number outcomes.
Analysis should follow cohesion from its establishment during meiotic prophase through chromosome pairing, recombination, and formation of stable homolog connections. The next critical point is selective arm-cohesion removal at anaphase I, followed by preservation of centromeric attachment until meiosis II. Tracking these stages connects chromosome organization with segregation outcomes.
Meiotic arm cohesion connects the behavior of chromosome arms with accurate chromosome inheritance during gametogenesis, the production of reproductive cells. Its study can therefore clarify how meiotic divisions support fertility and how segregation errors arise. This subject also provides context for reproductive disorders associated with abnormal chromosome numbers, including aneuploidy.