Foals affected with CA appear normal at birth, but develop symptoms at a young age. As soon as six weeks after birth, the disease may cause the death of neurons in the cerebellum of affected foals. This leads to symptoms such as head tremor and a lack of balance equilibrium (ataxia). They tend to startle easily and often fall. In several cases, the neurological symptoms may not even be apparent to owners. Symptoms of CA vary in severity.
Test specific information
In January 2011, the mutation for Cerebellar Abiotrophy (CA) in horses was described in the scientific literature. As a result, since 15 February 2011 DNA-tests for CA are based on the mutation-test.
Older results based on tests performed prior to 15 February 2011 have been based on a genetic test for CA that was not completely finished, as the specific mutation that causes the disease was not available. Instead, a group of genetic DNA-markers next to the disease gene was used as an indirect test.
Please contact us if you have any questions about the transition from indirect DNA-test to mutation-test.
Symptoms will develop at a young age. Within a few hours to a maximum of several weeks after birth, the characteristics that go with these genetic effects will become visible.
The Turnaround Time (TAT) depends on various factors, such as the shipment time of your sample to the test location, the test method(s) and whether the tests are performed completely or partially by a Partner Lab or Patent owner.
The TAT of tests performed at our facilities is normally 10 working days after receipt of the sample at the testing laboratory (VHL, VHP or Certagen). For tests performed by a Partner Laboratory (so-called "partner lab test") or patent owner, the TAT is at least 20 working days after receipt of your sample. Because the shipment time to our Partner Labs or patent owner may vary due to factors we cannot influence, the mentioned 20 working days are therefore an estimate.
Sometimes it is necessary to re-run your sample. We call this a retest. In that case, the TAT will of course be extended.
Location of disease or trait
This DNA test is available for the following breeds: Arabians. Additional information is available in the Frequently Asked Questions (FAQ).
For this DNA test we accept the following materials: Hair, Blood EDTA, Blood Heparin. Please contact Dr. Van Haeringen Laboratorium if you wish to submit other material as listed.
An animal can be free and has in that situation two healthy alleles. When used in breeding this animal will not become ill due to the disease. It cannot spread the disease in the population.
An animal can be carrier and has in that situation one healthy and one disease allele. When used in breeding 50 percent of the offspring will receive the disease allele. Carriers will not become ill.
An animal can be affected and has in that situation two disease alleles. When used in breeding all offspring will also receive the disease allele. Affected will become ill.
This genetic factor is inherited in an autosomal, recessive, mode. This means, that the individual can be free of the disease (homozygote normal), affected (homozygous affected) or carrier (heterozygous).
Carriers may spread the mutation in a population without showing symptoms themselves. Because of this, it is extremely important to identify carriers correctly to prevent spreading of a mutation.
Severity of Disease