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Different signals work together to change gene activity and guide hair follicle stem cells to become specific cell types.

Overactive Stat3 in mouse skin causes hair loss and cell structure damage.

Mutations in the Whn gene affect hair keratin gene expression differently.

HPV8 E6 gene causes growth of certain skin stem cells.

Scientists discovered a unique hair protein, KAP24.1, with a special structure, found only in the upper part of hair cuticles.

Mutations in the DSG4 gene cause fragile, sparse hair in humans, mice, and rats.

The hairless (hr) gene is essential for normal hair follicle function and its mutation leads to hair loss.

The hairy ear mutation in mice is linked to changes in gene expression affecting hair growth.

Keratin gene regulation is similar across mammals, affecting hair follicle differentiation.

Keratin structure in hair is stable at pH 5-6 but disrupts between pH 6-7.

Autophagy helps control skin inflammation and cancer responses and regulates hair growth by affecting stem cell activity.

Polyamines are important in deciding hair follicle stem cell behavior, affecting hair growth and loss.

Stem cell behavior varies with stimuli, and lineage changes can happen without affecting stem cell division.

Vitamin D receptor can control the hairless gene linked to hair loss even without vitamin D.

Histamine and its enzyme may help start hair regrowth.

A mutation in the KRT71 gene causes a hair disorder by disrupting hair follicle structure and texture.

Hair proteins change location and structure as hair cells mature.

Keratin-associated proteins are crucial for hair strength and structure.

PBX1 helps hair stem cells grow and change by turning on certain cell signals and preventing cell death, which may be useful for hair regrowth treatments.

Hairless protein reduces Msx2 gene activity, affecting hair follicle development.

The enzymes Tet2 and Tet3 are important for skin cell development and hair growth.

Kdm6b is crucial for skin cell differentiation.

Hirosaki hairless rats have sparse, twisted hair due to missing hair keratin genes.

Increasing mir-302 turns human hair cells into stem cells by changing gene regulation and demethylation.

Copper and iron cause keratin damage in hair by converting methionine to homocysteine.

High temperatures and certain chemicals can significantly change the amino acid content in human hair.

Hair follicle stem cells change states with age, affecting hair growth and aging.

Most mouse hair keratin genes are on chromosomes 11 and 15.