Hedgehog Signal and Genetic Disorders

Area of Science:

• Developmental Biology
• Molecular Biology
• Genetics

Background:

• The hedgehog (Hh) signaling pathway, comprising sonic hedgehog (Shh), Indian hedgehog (Ihh), and desert hedgehog (Dhh), is crucial for diverse biological events.
• These signaling molecules are vital from embryogenesis through adult stages, influencing cell differentiation, proliferation, survival, and body plan formation.

Purpose of the Study:

• To comprehensively review the signaling mediators of the Hh pathway.
• To elucidate the functions of Hh pathway components at cellular and organismal levels.
• To discuss the implications of Hh pathway malfunction in human genetic disorders.

Main Methods:

• Review of existing literature on Hh signaling mediators.
• Analysis of Hh pathway signal transduction mechanisms at the cellular level.
• Examination of the spatiotemporal expression patterns of Hh pathway molecules.
• Description of phenotypes in mutant mouse models.
• Discussion of human genetic disorders linked to Hh pathway dysfunction.

Main Results:

• Hh signaling mediators orchestrate complex cellular networks.
• Aberrant expression or mutations in Hh pathway genes and their downstream factors are associated with numerous genetic disorders.
• The review details the roles of Hh pathway components in tissue and organ development and function.

Conclusions:

• Understanding the intricate Hh signaling system is essential due to its broad biological roles.
• Malfunction of Hh signaling-related molecules contributes to a spectrum of human genetic disorders.
• This review provides a comprehensive overview of Hh pathway mediators and their significance.