Name: how organelles are split during cytokinesis
Uploaded: 2021-04-07T12:12:02.000Z
Duration: 2 min 33 s
Channel: JoVE

K12 Standards

Next Generation Science Standards

High School

Life Science

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms: Structures and Processes

HS-LS1-4

Distribution of Cytoplasmic Content

Bir hücrenin sitoplazması birçok farklı organel içerir. Her organel yapısı, işlevi ve kopya sayısı bakımından farklılık gösterir; Bu nedenle, bir hücre, her bir organel tipini yavru hücrelerine düzgün bir şekilde ayırmak için farklı stratejiler kullanmak zorundadır.
Nükleer zarf ve endoplazmik retikulum doğrudan bağlantılıdır ve bu nedenle yavru hücrelere dağılımları birleştirilir.
Profazda, nükleer zarf ve ilişkili proteinler endoplazmik retikulum ile birleşir. Tabaka benzeri endoplazmik retikulum, boru şeklinde bir yapıya dönüşür ve metafaz sırasında hücre korteksinin yakınında kendini yeniden düzenler.
Kromozom ayrışmasından sonra, endoplazmik retikulum kardeş kromatitleri çevreler ve nükleer zarfı yeniden şekillendirir.
Mitozda mitokondri, hücre boyunca yayılan parçalanmış mitokondri üretmek için fisyona uğrar.
Hücre bölünmesi sırasında, bu parçalanmış mitokondrinin, stokastik veya rastgele bir süreçle yavru hücrelere dağıtıldığına ve daha sonra şekillerini ve boyutlarını yeniden kazanmak için füzyona uğradığına inanılmaktadır.
Golgi cisimciğinin tek bir kopyası hücrede bulunur ve eşit dağılımı hücrenin hayatta kalması için hayati önem taşır. Golgi cisimciği, yavru hücrelere ayrılmadan önce adım adım parçalarına ayrılır.
Yığılmış sarnıç içeren Golgi şeridi, birden fazla mini yığına ayrılır ve bunlar daha sonra veziküllere ayrılır.
Anafazda, Golgi vezikülleri cistranae oluşturmak için füzyona uğrar ve daha sonra yeniden istiflenir. Daha sonra, telofazda sırasıyla orta gövde ve sentrozomun yakınında küçük ve büyük boyutlu ikiz Golgis oluşur.
Son olarak, sitokinez sırasında, daha küçük ikiz Golgi cisimleri, her bir yavru hücrede tek Golgi cisimciğini oluşturmak için daha büyük olanlarla birleşir.
Simetrik bölünme, bir hücrenin aynı kadere sahip iki özdeş yavru hücre ürettiği çoğu hücrede meydana gelir.
Bazı hücrelerde, hücre kaderi belirleyicilerinin eşit olmayan bir kalıtımının olduğu yerlerde asimetrik bölünme meydana gelir ve bu da aynı olmayan yavru hücrelerin üretilmesine neden olur.
Örneğin, kök hücreler, ana kök hücre gibi davranan bir yavru hücre üretmek için asimetrik hücre bölünmesine uğrayabilirken, diğer yavru hücre farklı bir hücre soyunu takip edebilir.

<ol>
	<li>Rabouille, Catherine ve Eija Jokitalo. "Hücre bölünmesi sırasında Golgi aygıtı bölünmesi." Moleküler zar biyolojisi 20, hayır. 2 (2003): 117-127.</li>
	<li>Yamano, Koji ve Richard J. Youle. "Mitokondriyal ve hücre bölünmesinin birleştirilmesi." Doğa hücre biyolojisi 13, hayır. 9 (2011): 1026.</li>
	<li>McCullough, Simon ve John Lucocq. "Mitotik HeLa hücrelerinde endoplazmik retikulum konumlandırma ve bölümleme." Anatomi Dergisi 206, hayır. 5 (2005): 415-425.</li>
</ol>

sitoplazmik İçeriğin dağılımı

Sitokinez, bir hücrenin kromozomlarını ve organellerini yavru hücrelere ayırır. Organeller hücre bölünmesinden önce bölünür ve büyürler ancak yeniden sentezlenemezler; bu nedenle hücrelerin hayatta kalabilmesi için her organelin en az bir kopyasını alması gerekir. Şu anda organellerin nasıl dağıldığına ilişkin ayrıntıların çoğu henüz tam olarak aydınlatılamamıştır. <h4>Sitoplazmik belirleyicilerin dağılımı</h4> Sitoplazmada çeşitli organellerin yanı sıra tuzlar, proteinler ve su bulunur. Peroksizomlar ve lizozomlar gibi küçük organellerin dağılımı basit difüzyonla açıklanabilir. Her hücre, her organelin birden fazla kopyasına sahip olduğundan, yavru hücrelerin organelin en az bir kopyasını alma olasılığı yüksektir. Bununla birlikte, ER veya kloroplast gibi büyük organellerin dağılımı, evrimsel olarak korunan daha karmaşık mekanizmalar gerektirir. <h4>Golgi aygıtlarının dağılımındaki son gelişmeler</h4> Hücreler mitoza girerken Golgi aygıtı parçalanır. Golgi aygıtının kardeş hücrelere dağılımını iki olası model açıklayabilir. İlk modele göre, profaz sırasında Golgi tübülleri yarılır ve küçük Golgi yığınları serbest bırakılır. Bunlar ayrıca veziküllere ve tübüllere parçalanır. Bu mitotik Golgi kümeleri (MGC) sitoplazmaya dağılır ve anafaz sırasında bölünen hücrelere ayrılır. İğ mikrotübülleri MGC'nin dağılımını düzenli bir şekilde yönlendirir. İkinci model, Golgi proteinlerinin ve zarlarının mitozun başlangıcında ER'de yeniden emildiğini ve Golgi'nin ER ile bölünmesine izin verdiğini varsayar. <h4>Mitokondri dağılımındaki son gelişmeler</h4> Mitokondriler, hücrenin hayatta kalması ve büyümesi için kritik organellerdir. Mitoz sırasında mitokondri daha küçük parçalara bölünür ve bunlar daha sonra yavru hücreler arasında ayrılabilir. Korunmuş bir protein DRP1, dış mitokondriyal zarı daraltır ve mitokondriyal fisyona neden olur. İki mitotik kinaz olan Cyclin B-Cdk1 ve Aurora-A, DRP1'in aktivasyonunu düzenler. <h4>Endoplazmik retikulumun dağılımındaki son gelişmeler</h4> İnterfaz endoplazmik retikulum (ER), Golgi aygıtları, endolizozomlar, kesecikler ve plazma zarı için zarları sentezleyen sürekli bir zardır. Mitoz sırasında ER parçalanabilir veya sarnıç olarak kalabilir. HeLa hücrelerinde ER, sarnıç olarak korunur ve hücre korteksiyle sınırlıdır. ER düzgün olmayan bir şekilde dağılmıştır ve merkezi sarnıçlar iğ ile ilişkilidir. ER, yavru hücrelere dağıtılmadan önce mitotik hücre korteksinin duvarlarına bağlanabilir.

Sitoplazmik İçeriğin Dağılımı

Sitokinez, bir hücrenin kromozomlarını ve organellerini yavru hücrelerine ayırır. Organeller hücre bölünmesinden önce bölünür ve büyür, ancak ...

Education

JoVE Core

Molecular Biology

Moleküler Biyoloji

Unit 2

Ünite 2

Cell Division

Hücre Bölünmesi

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

how organelles are split during cytokinesis

Cytokinesis splits a cell’s chromosomes and organelles into two daughter cells. Before cell division, organelles grow and divide. They cannot be made from scratch, so each daughter cell must inherit at least one copy to survive. Many details of this organelle sorting process are still not fully known.

The cytoplasm contains organelles, salts, proteins, and water. Small organelles such as peroxisomes and lysosomes can be shared by simple diffusion. Because cells contain many copies of these organelles, each daughter cell has a high chance of getting at least one. Larger organelles, such as the endoplasmic reticulum (ER) and chloroplasts, need more complex and conserved mechanisms.

The Golgi apparatus shows one of the best-studied cases. As cells enter mitosis, the Golgi breaks down. One model says the Golgi tubules are cut during prophase, and small stacks are released. These stacks are broken into vesicles and tubules, forming mitotic Golgi clusters, or MGCs, that spread through the cytoplasm and divide during anaphase with help from spindle microtubules. A second model suggests that Golgi proteins and membranes are taken back into the ER at the start of mitosis, so the Golgi is partitioned with the ER.

Mitochondria also change form before they are passed to daughter cells. These organelles are important for cell survival and growth. During mitosis, mitochondria break into smaller pieces by fission, which is the splitting of one organelle into two. The protein DRP1 constricts the outer mitochondrial membrane and drives this process. Two mitotic kinases, Cyclin B-Cdk1 and Aurora-A, regulate DRP1 activity.

The ER can also follow different patterns during mitosis. In interphase, the ER is a continuous membrane that helps make membranes for Golgi bodies, endolysosomes, vesicles, and the plasma membrane. During mitosis, it may fragment or stay as cisternae, which are flattened membrane sacs. In HeLa cells, the ER stays as cisternae and is kept near the cell cortex. The ER is not spread evenly, and the cisternae in the center are linked to the spindle. The ER may be tethered to the cortex wall before it is sorted into the daughter cells.

How Organelles Are Split During Cytokinesis

how-organelles-are-split-during-cytokinesis

mitosis and cytokinesis

Mitosis and Cytokinesis Stages

Mitosis and cytokinesis are the two main steps of cell division. Mitosis is the process that divides the nucleus, while cytokinesis splits the rest of the cell. During mitosis, the cell’s genetic material is separated into two sets. This helps form two new nuclei with the same genetic information. Cytokinesis then completes division by separating the cytoplasm, which creates two daughter cells. These stages work together to make cell division possible in growing and repairing tissues.

duplication of chromatin structure

Chromatin Rebuilding During DNA Replication

Chromatin rebuilding during DNA replication helps cells copy DNA and pass on chromosome structure to daughter cells. During cell division, the genome must be disrupted and then reassembled across the whole chromosome. This process allows chromatin to be inherited, rebuilt, and maintained in new cells. The basic unit of chromatin is the nucleosome. A nucleosome contains DNA wrapped around an octamer of histone proteins, with short linker DNA between neighboring nucleosomes. The histone proteins...

cohesins

Cohesins in Meiosis and Genetic Disorders

Cohesin protein complexes act like molecular glue that keeps sister chromatids together. They are important in both mitosis and meiosis. In mitosis, cohesin complexes are removed from chromosomes before anaphase begins. Meiosis has two rounds of chromosome separation. Meiosis I separates homologous chromosomes, while Meiosis II separates sister chromatids. This process produces four daughter cells. The Meiosis I cohesin complex is made of four subunits: Smc1, Smc3, Rec8, and Scc3. Rec8...

condensins

How Condensins Shape Mitotic Chromosomes

Condensins shape chromosomes during mitosis, the stage when a cell divides. These large protein complexes use ATP, the cell’s energy molecule, to help turn loose post-interphase DNA into compact, separate chromosomes. They organize and segregate chromosomal DNA so it can be passed on correctly. Plant and animal cells contain two condensin complexes: condensin I and condensin II. Each complex has five subunits. Two are SMC, or Structural Maintenance of Chromosomes, subunits. One is a kleisin...

the mitotic spindle

How the Mitotic Spindle Separates Chromosomes

The mitotic spindle is a microtubule-based structure that helps separate chromosomes during cell division. It forms in eukaryotic cells and moves sister chromatids to opposite ends of the parent cell. This leaves each new cell nucleus with the correct genetic material. A bipolar spindle has two poles, and that shape is important for chromosome segregation. In many animal cells, two centrosomes are present when mitosis begins. Each centrosome helps organize a circular set of microtubules at one...

centrosome duplication

Centrosome Duplication in the Cell Cycle

Centrosome duplication is a key part of the animal cell cycle. The centrosome is the main microtubule organizing center, or MTOC, in animal cells. It contains two cylindrical centrioles at its core. Each centriole has nine sets of three microtubules held together by proteins. The two centrioles sit at right angles and are surrounded by the pericentriolar matrix, or PCM, a shapeless protein cloud. Duplication starts early in the cell cycle so each daughter cell can receive a centrosome after...

microtubule instability

Microtubule Growth and Shrinkage

Microtubules are hollow, cylindrical filaments in the cell. They are about 25 nm wide and can range from 200 nm to 25 μm in length. Their main building blocks are GTP-bound tubulin subunits that form αβ-heterodimers, which then assemble into protofilaments. These protofilaments join by lateral bonds to create stable microtubule cylinders. Microtubules are highly dynamic because they repeatedly assemble and break down. They can even grow on one end while shrinking on the other at the same time.

spindle assembly

How the Mitotic Spindle Forms

The mitotic spindle forms through centrosome-mediated, chromatin-mediated, and microtubule-mediated pathways. These pathways often work at the same time. Together, they build a strong spindle apparatus for cell division. In most cells, centrosomes are the main sites where microtubules begin to grow. During the G2 to prophase transition, centrosomes mature and make more microtubules. The growing microtubules extend from both centrosomes, and their plus-ends search for chromosomes by attaching...

attachment of sister chromatids

Kinetochore-Microtubule Binding in Mitosis

Kinetochore-microtubule binding helps chromosomes line up and separate during mitosis. After the nuclear envelope breaks down, condensed chromosomes are exposed to the bipolar microtubules of the mitotic spindle. The kinetochore is a large, disc-shaped protein complex at the centromere region of each sister chromatid, and it serves as the microtubule binding site. Usually, the plus-end of a single microtubule inserts into the kinetochore. In some cases, a kinetochore first makes lateral...

forces acting on chromosomes

Chromosome Movement During Mitosis

Chromosome movement during mitosis depends on several small forces that act at different times and positions in the cell. In prometaphase, these forces help chromosomes move to the equatorial plane and line up at the metaphase plate. Because the forces change with location and stage, chromosome behavior also changes as mitosis continues. Microtubules and motor proteins create two main kinds of force on chromosomes: poleward force and anti-poleward force, also called polar-ejection force.

separation of sister chromatids

Anaphase Start and Chromatid Release

Anaphase starts when sister chromatids are released from one another and pulled toward opposite spindle poles. Before that happens, cohesion along the chromosomal arms is reduced from prophase to metaphase, which helps the sister chromatids resolve. A residual cohesin link still holds them together until the metaphase-to-anaphase transition. This leftover connection helps prevent early separation and reduces the risk of aneuploidy, or the wrong number of chromosomes, in daughter cells. At the...

the spindle assembly checkpoint

How Cells Safeguard Chromosome Separation

The spindle assembly checkpoint helps cells safeguard chromosome separation during anaphase. It acts as a molecular surveillance system. The checkpoint checks whether the steps needed for chromosome segregation are complete before the cell moves on. Many proteins work together to control this checkpoint. If mutations affect these proteins, a cell may enter anaphase too early. Chromosomes can then separate before the needed steps are finished. When this happens, the daughter cells may receive...

anaphase a and b

Chromatid Movement by Microtubule Forces

Chromatid movement during anaphase depends on microtubule forces at the spindle. Kinetochore microtubules grow from the spindle poles, and their plus ends attach to kinetochores on sister chromatids. The kinetochore protein complex Ndc80 makes low-affinity links with the microtubule plus end.

the contractile ring

How Cells Build the Contractile Ring

Contractile rings are built from microfilaments and help separate daughter cells during cytokinesis. This ring forms as the cell cycle moves forward, but the exact timing and coordination with other cell cycle events are still not fully understood. RhoA, a small GTPase in the Ras superfamily, controls contractile ring assembly and function. The inactive form of RhoA is bound to GDP. A guanine nucleotide exchange factor, or Rho-GEF, is located in the cortex region, where the next cell division...

determining the plane of cell division

How Cells Set the Division Plane

How cells set the division plane during cell division affects daughter cell size and, in many cases, cell fate. The plane of division is perpendicular to the plane of chromosome segregation. Different organisms use different cues to place it, based on their shape and needs. In animal cells, the cleavage furrow forms along the division plane from the cell cortex, the area just below the plasma membrane. The mitotic spindle is the main guide for this position. If the spindle axis changes, the...

the phragmoplast

How Plant Cells Build a New Wall

Plant cells build a new wall during cytokinesis with help from the phragmoplast. This plant structure forms from the central spindle and related cell parts as the cell finishes dividing. In animal cells, the comparable structure is the midbody, but in plants the phragmoplast expands outward to guide new wall formation. The mature phragmoplast has a donut-like shape. It has an outer leading region, a middle transition zone, and an inner lagging region. New microtubules are assembled...

distribution of cytoplasmic content

Cytokinesis splits a cell’s chromosomes and organelles into two daughter cells. Before cell division, organelles grow and divide. They cannot be made from scratch, so each daughter cell must inherit at least one copy to survive. Many details of this organelle sorting process are still not fully known. The cytoplasm contains organelles, salts, proteins, and water. Small organelles such as peroxisomes and lysosomes can be shared by simple diffusion. Because cells contain many copies of these...

anaphase promoting complex

APC Activates Chromosome Separation

The anaphase-promoting complex, or APC, helps control cell cycle progression by destroying specific proteins at the right time. These proteins are tagged with ubiquitin by ubiquitin ligases and then broken down by the proteasome. The SCF (Skp1/Cullin/F-box) complex and APC are two major ubiquitin ligases involved in this process. SCF stays active throughout the cell cycle, but APC turns on during the metaphase-to-anaphase transition. APC becomes active when Cdc20 or Cdh1 binds to it. These...

key terms and concepts

Learn how cells distribute organelles during cytokinesis, including the Golgi apparatus, mitochondria, and endoplasmic reticulum in daughter cells.

How Organelles Are Split During Cytokinesis | JoVE K12

molecular biology

JoVE Core Moleküler Biyoloji, hücrenin moleküler süreçlerini açık ve özlü animasyonlu video dersleriyle sergiler. Buna ek olarak, bilim insanı-eylem videolarında, bu kavramların uygulaması modern laboratuvarlarda gerçek deneylerle gösterilmektedir.

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Inheritance and Variation of Traits

HS-LS1-4.

Characteristics of Life

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Cell Structure

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Cytoplasm

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The Nucleus

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Globular and Fibrous Proteins

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Intrinsically Disordered Proteins

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Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that ...

Protein Complex Assembly

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Proteins: From Genes to Degradation

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Protein Complexes with Interchangeable Parts

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Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins, which carry out the essential functions of life through systems of specialized cells. [Assessment Boundary: Assessment does not include identification of specific cell or tissue types, whole body systems, specific protein structures and functions, or the biochemistry of protein synthesis.]

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Levels of Organization

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Accessory Organs

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Lipid Digestion

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Carbohydrate Digestion

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Overview

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Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms. [Clarification Statement: Emphasis is on functions at the organism system level such as nutrient uptake, water delivery, and organism movement in response to neural stimuli. An example of an interacting system could be an artery depending on the proper function of elastic tissue and smooth muscle to regulate and deliver the proper amount of blood within the circulatory system.] [Assessment Boundary: Assessment does not include interactions and functions at the molecular or chemical reaction level.]

HS-LS1-2

How Organelles Are Split During Cytokinesis

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