[Progress on polydactyly character of vertebrate]

Area of Science:

• Developmental biology
• Genetics
• Comparative genomics

Background:

• Polydactyly is a frequent limb abnormality observed across diverse vertebrate species.
• The limb phenotype and underlying developmental mechanisms of polydactyly show remarkable conservation among species.
• Homologous genes are implicated in controlling polydactyly traits across different vertebrate lineages.

Purpose of the Study:

• To review the developmental mechanisms controlling polydactyly in vertebrates.
• To discuss the homologous genes involved in the manifestation of polydactyly.
• To highlight recent findings on the genetic basis of preaxial polydactyly (PPD).

Main Methods:

• Review of existing scientific literature on polydactyly.
• Analysis of genetic and developmental studies in human and mouse models.
• Comparative analysis of limb development across vertebrate species.

Main Results:

• Evidence suggests a conserved developmental mechanism for polydactyly across vertebrates.
• Homologous genes play a crucial role in the genetic control of polydactyly.
• Latest research implicates disruptions in a long-range cis-acting regulator for Shh within the Lmbr1 intron in causing PPD.

Conclusions:

• Polydactyly development is governed by conserved genetic pathways in vertebrates.
• The Lmbr1 gene region contains critical regulatory elements for limb development, with disruptions leading to PPD.
• Understanding these genetic mechanisms provides insights into limb malformations and evolutionary developmental biology.