Guard hair length is positively correlated with guard hair diameter and down fiber length, but negatively correlated with variation in guard hair diameter and down fiber diameter.
Dark hair with a red beard likely evolved for camouflage, not attraction.
22 citations
,
January 1999 in “Dermatology” The condition might be caused by genetic changes after birth.
Hairlessness in mammals is due to complex genetic changes in both genes and regulatory regions.
26 citations
,
October 1998 in “Experimental Dermatology” A keratin hHb6 mutation causes a hair disorder with varying severity, influenced by other factors.
3 citations
,
February 1992 in “Journal of veterinary medicine. Series A” The farm-raised blue fox had a delayed winter coat cycle and abnormal hormone levels, but its hair growth and hormone changes were still linked.
28 citations
,
March 2014 in “Biological reviews/Biological reviews of the Cambridge Philosophical Society” The document concludes that hair curvature can be explained by the growth patterns caused by the shape and separation of cells in the hair follicle and is affected by specific molecular pathways.
December 2021 in “Molecular genetics and genomics” Cats with abnormal hair had DSG4 gene changes causing hair problems.
55 citations
,
December 2021 in “BMC Veterinary Research” Certain genes in Iranian sheep are linked to wool production and heat adaptation.
25 citations
,
March 2007 in “The journal of investigative dermatology/Journal of investigative dermatology” A specific gene mutation causes varying hair loss severity in a Pakistani family.
March 2026 in “Journal of Investigative Dermatology”
May 2019 in “Small Animal Dermatology” The dog has Color Dilution Alopecia, causing hair loss and increased risk of skin infections.
1 citations
,
July 2017 in “Skin appendage disorders” A 9-year-old Hispanic girl has Uncombable Hair Syndrome, which may improve with age and biotin treatment.
15 citations
,
May 2014 in “Journal of dermatology” Zouboulis syndrome is a rare condition that helps diagnose monosomy 18p early.
1 citations
,
June 1998 in “Journal of Forestry Research” Mammalian hair scales change from smooth to wavy due to friction.
4 citations
,
February 2025 in “BMC Genomics” Black wool in Qira sheep is linked to specific gene mutations, especially in the TYRP1 gene.
September 2022 in “Indian Journal of Paediatric Dermatology” Clouston syndrome is inherited in an autosomal dominant pattern and caused by a specific gene mutation, with no current treatment available.
Hairlessness in mammals is caused by combined changes in genes and regulatory regions.
Hairless mammals evolved quickly in both gene and non-gene areas related to skin and hair.
75 citations
,
September 2007 in “Journal of Heredity” FGF5 gene mutations cause long hair in domestic cats.
5 citations
,
October 2012 in “Veterinary Pathology” A Doberman Pinscher had a rare form of autoimmune disease causing hair loss and other severe symptoms.
21 citations
,
June 2009 in “Mammalian genome” A new mutation in the Hr gene causes hair loss in mice, similar to a human hair disorder.
December 2023 in “University of Southern Denmark Research Portal (University of Southern Denmark)” Digital access to medical info can help identify rare conditions.
February 2026 in “Small Ruminant Research” The IRF2BP2 gene affects sheep fleece quality by influencing fiber traits.
4 citations
,
December 2013 in “The Journal of Dermatology” A new mutation in the K6b gene caused a girl's late-appearing nail condition.
January 2002 in “Agritrop (Cirad)” The hr gene is linked to hair loss in Valle del Belice sheep.
4 citations
,
September 2016 in “World Rabbit Science” High wool density in Rex rabbits is linked to specific gene activity affecting hair follicle development.
13 citations
,
March 2020 in “Genes” Disrupting the FGF5 gene in rabbits leads to longer hair by extending the hair growth phase.
15 citations
,
October 1976 in “Biochemical Journal” Naked-mouse hair lacks certain proteins and has less soluble fibril.
September 2021 in “Mağallaẗ al-Muẖtar li-l-ʿulūm” Two sisters have rare hair disorders causing short, fragile, kinky hair.