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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

Breeds

Gene

Organ

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

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