Gene/Protein Disease Symptom Drug Enzyme Compound
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Specimens from cattle and sheep suspected of having cerebrocortical necrosis (CCN) were studied. Rumenal contents were examined for thiaminase-producing bacteria. Thiaminase activity was assessed in rumenal contents. The thiamine concentration of liver, brain and heart was determined and erythrocyte transketolase assessed. Diagnosis in each case, whether positive or negative for CCN, was decided by histopathological examination. There was a substantial agreement between the biochemical findings and the histological diagnosis indicating that a provisional diagnosis may be made on clinical and biochemical data alone. The findings are discussed in relation to other diseases which have the same neuropathological features. Attempts to isolate thiaminase-producing bacteria, which may be implicated in the aetiology of CCN, were inconclusive.
Vet Rec 1979 Jan 06
PMID:Diagnostic aspects of cerebrocortical necrosis. 43 5

In the latter part of 1991 an unusual neurological disease was recognised on several farms in England. This report describes the case histories and clinical, biochemical and pathological findings in six calves and two lambs aged from two to 44 weeks obtained from five of these farms. Laminar cerebrocortical necrosis and severe bilateral necrosis of the thalamus and/or striatum progressing to cavitation were recognised in their brains. These changes are similar to those of experimental sulphate toxicity. Morbidity rates of 16 to 48 per cent and mortality rates of 0 to 8 per cent were recorded. The affected animals did not respond to vitamin B1 treatment; the erythrocyte transketolase levels of in-contact cattle and of one untreated affected calf and one untreated lamb were within the normal range. All five farms had recently introduced a proprietary concentrate ration containing ammonium bicarbonate. After this ration was withdrawn no new cases of nervous clinical disease were observed. It is suggested that, in at least some cases, the morphology and topography of lesions may distinguish sulphate induced polioencephalomalacia from that of sporadic thiamine-dependent cerebrocortical necrosis.
Vet Rec 1994 Apr 02
PMID:Polioencephalomalacia associated with the ingestion of ammonium sulphate by sheep and cattle. 794 Dec 72