Ancient Gene 'Waist-less' Found Crucial for Spider Body Structure

New research uncovers the role of a long-lost gene in shaping the distinctive narrow waist of spiders.

Scientists identified 12 genes involved in spider embryonic development, focusing on the Texas brown tarantula.
The 'waist-less' gene, part of the Iroquois family, is essential for forming the spider's narrow waist.
This gene was lost in the common ancestor of insects and crustaceans, explaining its previous lack of study.
The discovery highlights the unique evolutionary path of chelicerates, including spiders and mites.
Further research is needed to explore the gene's role in other chelicerates like scorpions and harvestmen.