Blue Eyes Directory · blueeyesdirectory.com Record sbc-01, printed 14 September 2026. Every animal on this sheet has its own page and its own source at that address.
Rich Great Joy
prefix Great Joy · Siberian · line: Altai and Barnaul, both suspected · the source records no eye colour · Variant not known
No recorded parent link joins this cat to a founder or to a tested animal. What the record rests on instead is the line recorded on it, Altai and Barnaul, both suspected, which is a source's attribution and not a descent this register can walk; and no recorded parent at all, which is a gap in the sources and not a statement that the cat had none.
No parent is recorded for this cat in the register, so no genealogy can be drawn. That is a gap in the sources, not a statement that the cat had none. Any offspring the register holds are listed below.
Three or more variants could be present in this cat
DBE-ALT and DBE-CEL and Siberian, Altai or Barnaul unconfirmed.More than one variant could be present in this cat: DBE-ALT, DBE-CEL, Siberian, Altai or Barnaul unconfirmed. It is not established that any of them is, and it is not established that two are. A dominant allele comes from a parent, and this cat's recorded ancestry carries an attribution of each. A cat holding two is a compound heterozygote, which this survey records as the state associated with deaf and dead kittens, and nothing but a test distinguishes one from two.
Computed from the recorded parentage at every build, counting both the variants this survey adopts and the ones it records a source claiming and does not adopt. It is an upper bound and not a finding: it says what could be here, never what is.
The record
Register id
sbc-01
Sex
male
Cattery prefix
Great Joy
Breed, as stated
Siberian
Line
Altai and Barnaul, both suspected
Eye status
unknown: the source records no eye colour
Role
offspring
Relations named by the source
full brother of Roy Great Joy, same date; both parents are on the chart, and green-eyed relatives are available as controls
Litter key
greatjoy-2020-07-16
Country
Russia
Year
born 16 July 2020
EMS code
SIB d 03 24
The code read out
Siberian; red; bicolour, spotted tabby
The description held
Suspected carrier of two different unidentified variants. His branch of the chart is annotated 'ALTAI & Barnaul genes?'. This is the compound heterozygote case of this case study, in a living animal with a known pedigree homozygosity in this line is stated to be lethal. Professor Marie abitbol, who identified DBE-ALT and DBE-CEL, states in her 2026 World Cat Federation presentation, on the slide headed 'Malvina line', that this is a dominant blue eye line from Russia, that it was introduced into the Siberian breed, that homozygosity is lethal, that there is no data on deafness, and that the search for the variant is ongoing. This is the researcher's statement and not this survey's finding: the presentation gives the conclusion without the underlying counts, so no number of lost kittens is claimed here. It is recorded against every animal of the line because a breeder looks up an animal and not a line. What it means in practice: mating two carriers of this determinant together is expected to lose the quarter of the litter that inherits two copies, and because those kittens do not survive to be counted, a breeder doing it may see only small litters and conclude nothing is wrong. It is a different and worse harm from the compound heterozygote this register documents elsewhere, which is white and deaf and which lives. The determinant of this line remains unidentified and this note does not attribute one. S_LETHAL_206
Note
The code and the description do not use the same words for this coat. Both are recorded and neither is reconciled to the other.
Evidence grade
Reported asserted, with neither a test nor a traced descent
Blue Eyes Directory, blueeyesdirectory.com. Record sbc-01. This sheet is a snapshot of a register that grows: check the address above for the current version, and for the sources behind every animal named on it.
Source
the DBE Siberian chart. Recommended as a priority cohort: dated, pedigreed, living, with controls; and Abitbol M, 'CORIN and DBE variants in cats: what we know and what remains to be explored', World Cat Federation, 2026. A presentation and not a published paper
This directory is a working aid compiled from published charts, registry documents and breeder statements. It is not a register and it has no standing of any kind. The grade attaches to the animal, not to the line: a cat whose ancestor was genotyped is line-traced, not genotyped.