As of 1 April 2026, the PSJD database will become an archive and will no longer accept new data. Current publications from Polish scientific journals are available through the Library of Science: https://bibliotekanauki.pl
Severe combined immunodeficiency disease (SCID) is an autosomal recessive disease occurring in Arabian horses. A recent discovery of a five base pair deletion in the gene encoding DNA-PK catalytic subunit has led to a PCR based test to screen for carriers of this disease. It has been suggested that the origin of this mutation arose from a stallion that originated in Poland. For this reason the occurrence of the SCID allele was tested on a representative sample of Polish horses. None of the 271 horses tested were carriers for this mutated allele.