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Saunders's framework for understanding limb development as a platform for investigating limb evolution.

Abstract：

:John W. Saunders, Jr. made seminal discoveries unveiling how chick embryos develop their limbs. He discovered the apical ectodermal ridge (AER), the zone of polarizing activity (ZPA), and the domains of interdigital cell death within the developing limb and determined their function through experimental analysis. These discoveries provided the basis for subsequent molecular understanding of how vertebrate limbs are induced, patterned, and differentiated. These mechanisms are strongly conserved among the vast diversity of tetrapod limbs suggesting that relatively minor changes and tweaks to the molecular cascades are responsible for the diversity observed in nature. Analysis of the pathway systems first identified by Saunders in the context of animals displaying limb reduction show how alterations in these pathways have resulted in multiple mechanisms of limb and digit loss. Other classes of modification to these same patterning systems are seen at the root of other, novel limb morphological alterations and elaborations.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Young JJ,Tabin CJ

doi

10.1016/j.ydbio.2016.11.005

subject

Has Abstract

pub_date

2017-09-15 00:00:00

pages

401-408

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012-1606(16)30605-4

journal_volume

429

pub_type

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