The cotton 1R-MYB transcription factor GhMYS1 promotes fiber cell elongation by inhibiting secondary cell wall synthesis.
Yang X, Xia J, Zhang T, Lin J, Luo S
Crispr
Cotton fibers are essentially single cells that must stretch to extraordinary lengths before they harden — and a newly decoded molecular timer inside each one determines whether the fabric touching your skin ends up soft and fine or coarse and stiff.
Each cotton fiber is a single, hair-like cell that must first grow as long as possible before its walls harden into the structure that gives fabric its strength. Researchers found a protein that acts like a brake on the hardening process, keeping the fiber in growth mode longer. When they switched that protein off using gene editing, fibers ended up shorter and stiffer, proving this molecular brake is key to producing the long, fine fibers prized in high-quality textiles.
Key Findings
CRISPR knockout of GhMYS1 significantly shortened fiber length, increased cell wall thickness, and raised micronaire value (a measure of fiber coarseness), confirming its role in controlling fiber quality.
GhMYS1 directly binds the promoters of cellulose-building genes GhCESA4 and GhCESA8, repressing them during the fiber elongation window of 5–15 days post-anthesis to delay premature wall hardening.
A three-component regulatory chain — GhHOX3 activates GhMYS1, which in turn suppresses GhCESA4 and GhCESA8 — governs the developmental transition from fiber elongation to secondary cell wall synthesis.
chevron_right Technical Summary
Scientists identified a gene in cotton called GhMYS1 that acts as a molecular timer, keeping fibers growing longer by suppressing the genetic switch that triggers cell wall hardening. Deleting this gene shortened fibers and stiffened them, revealing a clear target for breeding higher-quality cotton.
Abstract Preview
Enhancing cotton fiber quality is essential for improving textile production. The transition from fiber elongation to secondary cell wall (SCW) synthesis is a critical developmental phase that dete...
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