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Limbless: a new genetic mutant in the chick.

K V Prahlad, G Skala, D G Jones

The Journal of Experimental Zoology

|September 1, 1979

Summary

A mutation causing total amelia (limblessness) in chickens is identified as an autosomal recessive gene. This genetic mutation affects limb development by causing the absence of the apical ectodermal ridge in embryos.

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Area of Science:

Developmental biology
Genetics
Avian biology

Background:

Limb development is a complex process involving precise genetic regulation.
Mutations can lead to severe developmental abnormalities, such as limb agenesis.

Purpose of the Study:

To describe a novel mutation in chickens that results in complete amelia (absence of limbs).
To genetically characterize the mutation responsible for the limbless condition.

Main Methods:

Phenotypic observation of affected chicken embryos.
Genetic analysis to determine the mode of inheritance.

Main Results:

A mutation causing total amelia in chickens was identified.
Genetic analysis revealed the limbless condition is controlled by an autosomal recessive gene.
Affected embryos lack the apical ectodermal ridge, a critical structure for limb outgrowth.

Conclusions:

The identified autosomal recessive gene is crucial for apical ectodermal ridge formation and subsequent limb development in chickens.
This mutation provides a model for studying the genetic basis of amelia.

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