A Track Record on SHOX: From Basic Research to Complex Models and Therapy.

Area of Science:

• Genetics
• Developmental Biology
• Endocrinology

Background:

• Short stature is frequently linked to SHOX deficiency, a genetic disorder with diverse clinical presentations.
• Mutations in the SHOX gene cause isolated short stature, Léri-Weill dyschondrosteosis, Langer mesomelic dysplasia, and contribute to Turner syndrome skeletal features.
• SHOX gene expression is tightly regulated, with pathogenic mutations often impacting regulatory enhancers.

Purpose of the Study:

• To summarize recent findings on the molecular and cellular functions of the SHOX gene.
• To provide insight into the role of SHOX in the etiopathogenesis of short stature and limb development.
• To review the use of animal models and cell cultures in studying SHOX function.

Main Methods:

• Analysis of causative SHOX mutations and their link to molecular lesions.
• Utilizing chicken and zebrafish models, along with micromass cultures and primary cell lines, to investigate SHOX function.
• Employing pathway and network analyses to identify SHOX interactors, target genes, and regulators.

Main Results:

• SHOX acts as a transcription factor crucial for bone development, growth plate biology, and apoptosis.
• Nearly half of pathogenic mutations affect SHOX enhancers, influencing gene expression levels.
• Clinical severity of SHOX deficiency varies by gender, ranging from normal stature to severe skeletal dysplasia.

Conclusions:

• SHOX deficiency is a significant genetic cause of short stature with complex molecular underpinnings.
• Understanding SHOX function is critical for diagnosing and potentially treating various forms of short stature.
• Ongoing research using diverse models continues to elucidate the intricate roles of SHOX in skeletal development.