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A little winning streak: The reptilian‐eye view of gastrulation in birds
Author(s) -
Bertocchini Federica,
Alev Cantas,
Nakaya Yukiko,
Sheng Guojun
Publication year - 2013
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/dgd.12014
Subject(s) - gastrulation , primitive streak , epiblast , biology , mesoderm , endoderm , ingression , germ layer , brachyury , intermediate mesoderm , amniote , anatomy , embryo , microbiology and biotechnology , embryogenesis , vertebrate , genetics , embryonic stem cell , induced pluripotent stem cell , gene
The primitive streak is where the mesoderm and definitive endoderm precursor cells ingress from the epiblast during gastrulation. It is often described as an embryological feature common to all amniotes. But such a feature has not been associated with gastrulation in any reptilian species. A parsimonious model would be that the primitive streak evolved independently in the avian and mammalian lineages. Looking beyond the primitive streak, can one find shared features of mesoderm and endoderm formation during amniote gastrulation? Here, we survey the literature on reptilian gastrulation and provide new data on B rachyury RNA and laminin protein expression in gastrula‐stage turtle ( P elodiscus sinensis ) embryos. We propose a model to reconcile the primitive streak‐associated gastrulation in birds and the blastopore‐associated gastrulation in extant reptiles.