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関連する概念動画

Distribution of Cytoplasmic Content02:33

Distribution of Cytoplasmic Content

4.4K
Cytokinesis segregates a cell’s chromosomes and organelles into its daughter cells. Organelles divide and grow prior to cell division but cannot be synthesized de novo; therefore, cells must receive at least one copy of each organelle to survive. Currently, many of the details of how the organelles are distributed are not yet fully elucidated.
Distribution of cytoplasmic determinants
The cytoplasm contains various organelles, as well as salts, proteins, and water. The distribution of...
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Centrosome Duplication02:25

Centrosome Duplication

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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
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Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Cellular Differentiation00:57

Cellular Differentiation

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How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...
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Brainstem01:19

Brainstem

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The brainstem, located inferior to the brain and superior to the spinal cord, serves as a bridge between the cerebrum and the spinal cord. It plays a vital role in relaying information and controlling critical life functions. It comprises three primary regions: the midbrain, pons, and medulla oblongata.
The Midbrain
The midbrain is located beneath the diencephalon and connects the cerebrum with the lower parts of the brain. The cerebral peduncles are prominent midbrain structures that house the...
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Cerebellum: Anatomical Regions01:17

Cerebellum: Anatomical Regions

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The cerebellum, also known as the "little brain," is located in the posterior cranial fossa, inferior to the tentorium cerebelli and dorsal to the brainstem. It plays a significant role in motor control, coordination, and proprioception.
Cerebellar Structure
Externally, the cerebellum features a highly convoluted surface with numerous folia (narrow ridges) separated by shallow sulci (grooves). The cerebellum is divided into two hemispheres by a thin median structure known as the vermis. The...
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Updated: Nov 25, 2025

Ex Vivo Culture of Chick Cerebellar Slices and Spatially Targeted Electroporation of Granule Cell Precursors
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保存された細胞型集合を繰り返し複製することによって進化した小脳核

Justus M Kebschull1, Ethan B Richman1,2,3, Noam Ringach1

  • 1Department of Biology, Stanford University, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|December 18, 2020
PubMed
まとめ

複合的な脳進化は 保存された細胞型の集合を 脳の核で複製することを含みます この過程で シンプルな回路が 複雑な脳領域に 進化する過程が説明されます

さらに関連する動画

Isolation of Distinct Cell Populations from the Developing Cerebellum by Microdissection
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Isolation of Distinct Cell Populations from the Developing Cerebellum by Microdissection

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Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark
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Isolation and Cultivation of Neural Progenitors Followed by Chromatin-Immunoprecipitation of Histone 3 Lysine 79 Dimethylation Mark

Published on: January 26, 2018

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関連する実験動画

Last Updated: Nov 25, 2025

Ex Vivo Culture of Chick Cerebellar Slices and Spatially Targeted Electroporation of Granule Cell Precursors
10:02

Ex Vivo Culture of Chick Cerebellar Slices and Spatially Targeted Electroporation of Granule Cell Precursors

Published on: December 14, 2015

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Isolation of Distinct Cell Populations from the Developing Cerebellum by Microdissection
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Isolation of Distinct Cell Populations from the Developing Cerebellum by Microdissection

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科学分野:

  • 神経科学
  • 進化生物学
  • ゲノミクス

背景:

  • 単純な回路から複雑な脳の進化は 神経科学の根本的な問題です
  • 脳の領域の進化を促す 細胞と分子のメカニズムを理解することは 極めて重要です

研究 の 目的:

  • 脳の領域の進化を,小脳核内の細胞タイプレベルで調査する.
  • 種間の保存と分岐の細胞集団と 脳進化におけるその役割を特定する.

主な方法:

  • 単核RNA配列解析はマウス,鶏,ヒトで行われました.
  • STARmapの空間トランスクリプトーム解析と中枢神経系全体のプロジェクショントレーシングが利用された.
  • 小脳核の細胞型組成と接続性の比較分析

主要な成果:

  • 2つの領域特有の刺激性ニューロンクラスと3つの領域不変性抑制性ニューロンクラスを含む,保存された細胞タイプが小脳核で特定されました.
  • この保存されたセットは,新しい領域を生成するために複製された原型小脳核を形成します.
  • マウスの側頭前皮質に発射する特定の刺激性細胞クラスは,拡張した人間の側頭核に優勢である.

結論:

  • 脳の領域の進化は 細胞型全体の複製と分岐によってモデル化できます
  • 発見は小脳と機能的な組織の進化的拡大の洞察を提供します.
  • この研究は,神経回路の進化を理解するための細胞型の解像度枠組みを提供します.