June 28, 2021
Let's Talk Color!
Genetics can be complicated, partially because geneticist are still looking to locate and isolate specific traits we know exist, but cannot test for (i.e.graying/fading/irish spotting).
*I will touch on Fade at a future date.
Genetics, is one of my favorite parts of (behind the scene) my breeding program. I can easily forget to switch
from thinking bb (Tyrosinase Related Protein 1 (TYRP1)) to brown. Then Brown is the correct terminology, BUT many breeds(ers)
and families use the term Chocolate, and if you have an Aussie (AussieDoodle) this will be referenced as Red. Brown/Chocolate/Red are
ALL visually the same pigment its read as: Gene/Tyrosinase Related Protein 1 (TYRP1) with is the pigment of black or brown on the B
locus. I find preferences in speaking in both Locus & correct terminology, but will also use breed/breeder/terminology.
Let's back up...and start simpler:
BASICS OF COLOR TRAITS IN BERNEDOODLES:
K LOCUS DOMINANT BLACK // Gene: Canine Beta-Defensin 103 (CBD103) // Coat Modifier
The K Locus = pattern visibility(hidden pattern)
Tied to the A Locus
A LOCUS AGOUTI //Gene: Agouti Signalling Protein (ASIP) // Coat Modifier
The A Locus = pattern
Determinations Tied to K Locus & E Locus
B LOCUS BROWN // Gene: (Tyrosinase Related Protein 1 (TYRP1) // BASE COAT COLOR
The B Locus: Pigmentation
Determinations Tied to E Locus & M Locus;
*AND The untestable "fade; with linkage to I Locus
E LOCUS EXTENSION // Gene: Melanocortin Receptor 1 (MC1R) // BASE COAT COLOR
// Coat Modifier
The E Locus: Extension determining capability of pigmentation.
Where eumelanin/phaeomelanin are produced.
Determination Tied to K,A,B,M,I
S LOCUS WHITE SPOTTING// Gene: MITF // Coat Modifier
The S Locus: Determinate to most white marking
Let's Talk Color!
Bernedoodle Basics & The Power of Recessive RED "ee"
June 29, 2021
K LOCUS
KB (DOM) = No Pattern Expressed from A Locus
or SOLID
Kbr (DOM) = Brindle
KY = Pattern Expressed from A Locus
Dominance descending
Ay = Sable
aw = Agouti
at = Tan points
a = Recessive Black
Dominance descending
B = Black Pigment
b = Brown Pigment
E LOCUS
Dominance descending
Em = Masked
E = Normal Extension
EgEhEg = Grizzle
ee = recessive red
A LOCUS
B LOCUS
S LOCUS
There is not One, but Two...
S = no white or minimal
sp = "parti"
si = Irish Spotting
One from DAD
One from MOM
ky
kyky
ky
at
ata
a
< This Dog would be patterned according in accordance to A locus
Since She > is kyky she can show pattern assigned to A locus-- ata would be tan point carrying for recessive black
B
Bb
b
< She has Black (B) pigment and carry for brown (b). Her nose is black.
e
ee
e
We cannot test for Irish Spotting sisi. However, she is visibly Irish Spotted, Not to be confused with Psuedo.
si
sisi
si
^^So genetically she should be visible tan point (atat or ata). But.... The E locus shows ee, which is recessive red. Recessive red does NOT allow for Tan points to be visible.
Notes_________________________
- if she was "Ee" or "EE", Miss Bernedoodle would be a Black/Rust/White Traditional Tri.
-Pared with Bb or bb brown pups would be produced.
-Paired with a kyky atat EE would produce 100% tan pointed puppies.
---kyky ata would have the potential to have 25% solid pups "aa"
---Ee paring would produce 75% recessive red
---ee pairing 100% recessive red.
--KbKb paring 0% visible tan points. Kbky 50% visible
---Kbrky Brindle Pointed Tan Points.
- ALL "ee" BERNEDOODLES DOGS SHOULD BE TESTED FOR MERLE prior to breeding (whether you plan to breed to Merle or not). "ee" HIDES MERLE
kyky
ata
Bb
ee
sisi
GENETIC
COLOR TRAIT
Red Tuxedo
**STAR FOR LATER