cat coat – color, pattern and genetics · cat coat – color, pattern and genetics sonja prohaska...
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Cat Coat – Color, Pattern and Genetics
Sonja Prohaska
Computational EvoDevo
University of Leipzig
June 10, 2016
Cat Coat – Color, Pattern and Genetics
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Cat Coat Color, Pattern and Genetics
Cat Coat – Color, Pattern and Genetics
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How Hair Gets Color
◮ melanoblasts derive from neural crest
◮ dorso-ventral migration (back to belly)
◮ differentiation into melanocytes
◮ melanocytes move into epidermis and
to the basis of hair folicle
◮ production of melanin
◮ formation of melanosomes
Cat Coat – Color, Pattern and Genetics
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How Hair Gets Color – melanocytes
Melanine, the pigment, is produced by melanocytes and stored inmelanosomes.
Cat Coat – Color, Pattern and Genetics
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Excursion into Genetics
◮ locus vs. gene
◮ allele
◮ diploidy
◮ homozygote – heterozygote
◮ dominant – recessive
◮ autosome – sex chromosome
◮ female X,(inactive)X – male X,Y
◮ epistatic – hypostatic
◮ pleiotrophic effect
Cat Coat – Color, Pattern and Genetics
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The W “White” Locus
◮ “dominant white” (W-locus)
or “piebald-spotted” (S-locus)
◮ dorso-ventral migration ofmelanoblasts
◮ allels: W, ws , w+
◮ W – (dominant) white
◮ piebald spotted phenotypes
wsws – more than 50% white
wsw+ – less than 50% white
◮ w+w+ – completely pigmented
Dysfunction in dorso-ventral melanoblast migration is the source ofwhite spotts and patches.
Cat Coat – Color, Pattern and Genetics
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Molecular Basis of “white” Alleles
◮ gene kit: tyrosine-protein kinase and transmembrane receptor
◮ ligand: stem cell factor (MGF)
◮ relevant for skin and eye color, hearing ability
◮ temporal and tissue-specific expression
◮ retrovirus FERV (feline endogenous retrovirus)
◮ ws – retrovirus insertion in intron 1 of kit
◮ W – only LTR of retrovirus in intron 1 of kit
Cat Coat – Color, Pattern and Genetics
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Piebald-Spotted Phenotypes in Rats (H locus)
“irish” “berkshire” “hooded”
Cat Coat – Color, Pattern and Genetics
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“Dominant white” Phenotype and Eye ColorHair, skin and eye color depend on the function of kit.
“blue-eyed” “odd-eyed” “orange-eyed”
Dominant White cats with odd-eye color are usually deaf on theear close the the blue eye.
Cat Coat – Color, Pattern and Genetics
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How Hair Gets Color – Pigment Chemistry
Eumelanin
Pheomelanin
Cat Coat – Color, Pattern and Genetics
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The B “black” Locus
◮ eumelanin production
◮ alleles: B, b, bl
◮ B – black
◮ bb – brown, “chocolate”
◮ blbl – light brown, “cinnamon”
Solid black cats might get a brownishtinge to their fur if the diet is deficient intyrosine.
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the O “orange” Locus◮ pheomelanin production
◮ alleles: O, o
◮ O is located on the X chromosome
→ sex-linked
◮ males are XY
XOY – orange (no “black”)
XoY – no orange (“black”)
◮ females are XX
◮ one X is inactivated
◮ X inactivation differs from cell tocell
XOXO – orange (no “black”)
XoXo – no orange (“black”)
XOXo – orange - black mixed
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“Gluckskatzen” und Co.
Tortoiseshell
◮ a XOXo female cat
◮ solid color, no spotting
◮ orange where Xo inactive
◮ black where XO is inactive
Calico
◮ an XOXo female cat
and piebald-spotted
◮ shows patches of orange
◮ and patches of black
◮ where she is not white
◮ “Gluckskatze”
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The D “dilution” Locus
◮ pigment density
◮ alleles: D, d
◮ D – full density
◮ dd – diluted
◮ dilution turns
black → blue
chocolate → lilac
cinnamon → fawn
orange → cream
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Summary of Solid Colors
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The C “color” Locus
◮ codes the tyrosinase gene
first step in melanin synthesis
◮ allels: C, cb, cs , c
◮ temerature-sensitive variants
◮ C is completely dominant
◮ C > cb = cs > c
◮ C – full color
◮ cscs – Siamese/Pointed
◮ cbcs – Tonkinese/Mink
◮ cbcb – Burmese/Seal
◮ cc – albino white
Complete dysfunction of tyrosinase on both alleles results in nopigment at all. An albino white cat has pale blue or pinkish eyes.
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The A “agouti” Locus◮ transient inhibition of pigment
production
◮ during hair growth
◮ causes bands of lighter color alongthe hair
◮ allele: A, a
◮ A – agouti bands
◮ aa – no agouti bands
◮ undercoat has color of bands
◮ banding pattern◮ smoked◮ shaded◮ tipped◮ tabby
Agouti hair banding is required to make patterns visible.
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The I “inhibition” Locus
◮ Melanin inhibition
◮ seen in agouti banding of tabbies
◮ allele: I, i
◮ bands of lighter color
◮ I – white bands
◮ ii – yellow bands
◮ undercoat has color of bands
tabby shaded
yellow brown goldenwhite grey silver
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The Ta “tabby” and Ti “ticked” Locus
◮ alternate ticked and solid color hair
◮ causing formation of patterns
◮ alleles: TaM , tab
◮ TaM – mackerel (getigert)
◮ tab,tab – bloched (gestromt)
◮ alleles: Tia, Ti+
◮ Tia – Abyssinian (ticked allover)
◮ Tia,Ti+ (stripes on face, legs andtail)
◮ Ti+ – non-Abyssinian
◮ Ti is epistatic to Ta
These cats are back/brown (B), agouti (A), golden (ii) tabbies.
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Modifier of Tabby◮ tagpep and Edr3
◮ allel
◮ mackerel → dots
◮ bloched → spots
◮ bloched → rosetted
cheetah (Gepard) and king cheetah
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References
David et al. Endogenous Retrovirus Insertion in the KIT Oncogene
Determines White and White spotting in Domestic Cats. G3(Bethesda). 2014; 4(10):1881-91.
Eizirik et al. Defining and Mapping Mammalian Coat Pattern
Genes: Multiple Genomic Regions Implicated in Domestic Cat
Stripes and Spots. Genetics. 2010; 184:267-275.
Kaelin et al. Specifying and Sustaining Pigmentation Patterns in
Domestic and Wild Cats. Science. 2012; 337(6101):1536-1541.
Cat Coat – Color, Pattern and Genetics