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Related Concept Videos

Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Determination01:51

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...

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Related Experiment Video

Updated: May 19, 2026

Modeling Human Cerebellar Development In Vitro in 2D Structure
06:14

Modeling Human Cerebellar Development In Vitro in 2D Structure

Published on: September 16, 2022

Heterochronic protein expression patterns in the developing embryonic chick cerebellum.

E A Gilbert1, Y H Lim, M K Vickaryous

  • 1Department of Biomedical Sciences, Ontario Veterinary College, University of Guelph, 50 Stone Road, Guelph, Ontario, Canada.

Anatomical Record (Hoboken, N.J. : 2007)
|August 7, 2012
PubMed
Summary

The embryonic chick is a valuable model for neural development research. Chick cerebellar development, including Purkinje cell formation and protein expression, occurs earlier than in mice, highlighting heterochrony in neurodevelopment.

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

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Last Updated: May 19, 2026

Modeling Human Cerebellar Development In Vitro in 2D Structure
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Electroporation of the Hindbrain to Trace Axonal Trajectories and Synaptic Targets in the Chick Embryo
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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

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Comparative Anatomy

Background:

  • The embryonic chick offers advantages for studying neural development due to cost and rapid development.
  • Chick cerebellar development shares similarities with mice, featuring a comparable embryonic period.

Purpose of the Study:

  • To investigate in ovo cerebellar development in the chick.
  • To analyze the expression patterns of Calbindin (CB), Zebrin II (ZII), and Calretinin (CR) during chick cerebellar development.

Main Methods:

  • In ovo investigation of chick cerebellar development.
  • Immunohistochemical analysis of Calbindin, Zebrin II, and Calretinin expression during embryonic development.

Main Results:

  • Asynchronous expression patterns of CB, ZII, and CR were observed during cerebellar development.
  • Purkinje cells showed distinct expression timelines for CB, ZII, and CR.
  • Chick cerebellar development events, including Purkinje cell maturation, initiate approximately 5-7 days earlier than in mice.

Conclusions:

  • The sequence of Purkinje cell development and protein expression is conserved between chicks and mice.
  • Precocial development in the chick cerebellum suggests a significant role for heterochrony in neurodevelopment.