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Occipitoatlantoaxial malformation (OAAM) is a defect whereby the first cervical vertebra (atlas) resembles the base of the skull (occiput) and the second cervical vertebra (axis) resembles the atlas.
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Specifications
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Gene | |
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specimen | Hair, Blood EDTA, Blood Heparin, Semen, Tissue |
Mode of Inheritance | |
Chromosome | |
Also known as | |
Year Published |
General information
Occipitoatlantoaxial malformation (OAAM) is a defect whereby the first cervical vertebra (atlas) resembles the base of the skull (occiput) and the second cervical vertebra (axis) resembles the atlas. The homeobox (HOX) gene is involved in the development of both the axial and skeleton.
Clinical features
Clinical features include abnormal head position, progressive ataxia, extended neck posture and visible unevenness along the cervical spine. OAAM affects the mobility of the neck, which is characterised as loss of extension and flexibility. The affected horses may be found dead or alive. The living horses may develop tetraparesis or progressive ataxia is able to develop.
Additional information
References
Pubmed ID: 28111759
Omia ID: 81