Antennapedia
Antennapedia is a homeotic gene first discovered in the fruit fly Drosophila melanogaster. It is part of the Hox gene family, which plays a crucial role in the development of the anterior-posterior axis and the segmentation of the body during embryonic development. The gene is named for its ability to cause the transformation of antennae into legs when mutated.
Function
Antennapedia is a transcription factor that binds to specific DNA sequences, regulating the expression of other genes. It is involved in the development of the thoracic segments of the fly, particularly influencing the formation of the second thoracic segment (T2), which gives rise to the legs and wings.
Mutations
Mutations in the Antennapedia gene can lead to dramatic changes in the body plan of Drosophila. The most famous mutation causes the transformation of the antennae into legs, a phenomenon that underscores the gene's role in segment identity. This mutation is a classic example of a homeotic transformation, where one body part is replaced by another.
Homology
The Antennapedia gene is highly conserved across different species, indicating its fundamental role in development. Homologs of Antennapedia have been found in a wide range of organisms, from insects to vertebrates, highlighting the evolutionary importance of Hox genes in body plan organization.
Research
Research on Antennapedia has provided significant insights into the mechanisms of developmental biology and evolutionary biology. Studies have shown how changes in Hox gene expression can lead to the diversity of body plans observed in the animal kingdom.
Related Genes
Antennapedia is part of the Antennapedia complex (ANT-C), which includes other important homeotic genes such as Ultrabithorax (Ubx) and Sex combs reduced (Scr). These genes work together to specify the identity of different body segments.
See Also
References
External Links
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