DNA polymorphism analysis of hereditary multiple exostoses in horses

Area of Science:

• Genetics
• Oncology
• Veterinary Medicine

Background:

• Hereditary multiple exostoses is a skeletal disorder in horses.
• Oncogenes are genes that can potentially cause cancer.
• Understanding genetic factors in equine diseases is crucial for diagnosis and treatment.

Purpose of the Study:

• To investigate genomic DNA polymorphisms in horses with and without hereditary multiple exostoses.
• To identify specific oncogenes and their variations associated with the condition.

Main Methods:

• Restriction fragment-length polymorphism (RFLP) analysis was performed on equine genomic DNA.
• DNA samples were digested with 12 restriction enzymes.
• Digested DNA was hybridized with 6 isotopically labeled oncogene probes.

Main Results:

• The viral oncogene v-ras was not detected in the equine genome.
• Cellular oncogenes (c-raf-1, c-fes, c-myb, c-myc, c-sis) were present in all samples.
• Similar hybridization patterns for most oncogenes were observed between healthy horses and those with hereditary multiple exostoses.
• Unique restriction fragment-length polymorphisms were identified specifically with the c-raf-1 probe in BamHI- and PstI-digested DNA.

Conclusions:

• The viral oncogene v-ras is absent in the equine genome.
• While most oncogenes showed no significant differences, specific polymorphisms in the c-raf-1 gene were found in horses with hereditary multiple exostoses.
• These c-raf-1 gene variations may be associated with the development of hereditary multiple exostoses in horses.