Connective Tissue Disorders in Domestic Animals

Area of Science:

• Veterinary Pathology
• Connective Tissue Diseases
• Animal Genetics

Background:

• Soft tissue disorders are rare in domestic animals, hindering diagnostic and pathogenetic understanding.
• Ehlers-Danlos syndrome (EDS) in dogs and cats presents with limited skin issues, unlike human forms.
• Dermatosparaxis in cattle and sheep, and Marfan syndrome (MFS) in cattle, show genetic links to connective tissue defects.

Purpose of the Study:

• To review current knowledge on uncommon soft tissue disorders in animals.
• To highlight genetic causes and clinical manifestations of EDS, dermatosparaxis, MFS, HERDA, WFFS, and DSLD.
• To present novel findings on proteoglycan and collagen gene expression in Degenerative Suspensory Ligament Desmitis (DSLD).

Main Methods:

• Literature review of animal soft tissue disorders.
• Analysis of clinical presentations and diagnostic features (histopathology).
• Genetic analysis (gene mutations) and molecular studies (proteoglycan and collagen gene expression).

Main Results:

• EDS in canines and felines has minor clinical impact compared to humans.
• Dermatosparaxis is linked to ADAMTS2 gene mutations; MFS in cattle involves FBN1 mutations.
• HERDA in horses involves cyclophilin B mutations; WFFS presents with skin fragility and joint hyperextensibility.
• DSLD shows excessive proteoglycan accumulation, increased BMP2, abnormal decorin, and altered collagen/proteoglycan gene expression.

Conclusions:

• Animal connective tissue disorders share genetic bases with human conditions but exhibit varying clinical severity.
• Further research into the pathogenesis of these rare diseases is crucial for improved diagnostics and treatments.
• Novel findings in DSLD suggest complex molecular mechanisms involving proteoglycans and collagens.