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Determination

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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: Jul 17, 2026

Dissection of Larval CNS in Drosophila Melanogaster

Dissection of Larval CNS in Drosophila Melanogaster

Published on: November 9, 2006

Segmental determination in Drosophila central nervous system.

A Ghysen, L Y Jan, Y N Jan

|April 1, 1985

Summary

Mutations in the bithorax complex affect specific neural structures in Drosophila larvae. Even mild genetic changes, like haploinsufficiency, significantly impact the central nervous system development.

Area of Science:

Developmental biology
Neuroscience
Genetics

Background:

The central nervous system (CNS) of Drosophila larvae exhibits segment-specific features.
The bithorax complex is known to regulate segment identity in Drosophila development.
Understanding the genetic control of neural development is crucial for deciphering complex biological processes.

Purpose of the Study:

To investigate the role of the bithorax complex in controlling segment-specific neural structures in Drosophila larvae.
To analyze the effects of bithorax complex mutations on both neural and epidermal development.
To assess the sensitivity of the Drosophila larval CNS to genetic perturbations within the bithorax complex.

Main Methods:

Analysis of segment-specific neural features in Drosophila larvae.

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Dissection and Immunofluorescent Staining of Mushroom Body and Photoreceptor Neurons in Adult Drosophila melanogaster Brains

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Genetic analysis of mutations within the bithorax complex.

Comparative study of neural and epidermal phenotypes.

Main Results:

Two distinct segment-specific neural features were identified and analyzed.
Mutations in the bithorax complex demonstrated parallel yet independent effects on neural structures and larval epidermis.
The central nervous system was found to be highly sensitive to mild perturbations of the bithorax complex, including haploinsufficiency.

Conclusions:

The bithorax complex plays a significant role in patterning segment-specific neural elements in Drosophila larvae.
Neural development in Drosophila is sensitive to genetic dosage, as shown by the effects of haploinsufficiency.
These findings highlight the intricate relationship between genetic regulation, neural development, and segment identity.