The molecular genetics of human appendicular skeleton

Area of Science:

• Human genetics
• Developmental biology
• Orthopedics

Background:

• Appendicular skeletal abnormalities result from disrupted limb and digit development.
• These inherited conditions significantly impact locomotion and movement.
• Existing classifications, like the 2019 revision, categorize these genetic skeletal disorders.

Purpose of the Study:

• To review the embryology, developmental pathways, and molecular genetics of human appendicular skeletal malformations.
• To focus on specific conditions: polydactyly, syndactyly, brachydactyly, split-hand-foot malformation, and clubfoot.
• To consolidate current knowledge on the genetic basis of these rare skeletal disorders.

Main Methods:

• Systematic review of published literature on appendicular skeletal malformations.
• Analysis of genetic data related to identified genes and their role in disease pathophysiology.
• Compilation of information on embryology and developmental pathways.

Main Results:

• Identified genes involved: 9 for polydactyly, 5 for split-hand-foot malformation, 9 for syndactyly, 8 for brachydactyly, and 1 for clubfoot.
• Current molecular genetic understanding is limited but growing for these conditions.
• The review synthesizes existing knowledge on genetic causes.

Conclusions:

• Understanding the molecular genetics of appendicular skeletal malformations is crucial for rare disease research.
• This synthesized knowledge will aid in genetic counseling and molecular diagnosis for affected individuals.
• Further research into the identified genes and pathways is warranted.