Phosphatized Polar Lobe-Forming Embryos from the Precambrian of Southwest China
Abstract
In developing embryos of some extant spiralian animals, polar lobe formation is one of the symmetry-breaking mechanisms for segregation of maternal cytoplasmic substances to certain blastomeres and not others. Polar lobe formation leads to unique early cleavage morphologies that include trilobed, J-shaped, and five-lobed structures. Fossil embryos similar to modern lobeforming embryos are recognized from the Precambrian Doushantuo Formation phosphates, Weng'an, Guizhou Province, China. These embryos are abundant and form a developmental sequence comparable to different developing stages observed in lobe-forming embryos of extant spiralians. These data imply that lobe formation is an evolutionarily ancient process of embryonic specification.
Additional Information
© 2006 American Association for the Advancement of Science. 8 February 2006; Accepted 27 April 2006. Supported by Chinese Academy of Science grant KZCX3-SW-141; National Science Foundation of China grants 42432006, 40302004, 10490190, 60172042, and 10490194; 111 Project and 985-2 Project of Nanjing University, LPS of Nanjing Institute of Geology & Paleontology, NASA/Ames grant NAG2-1541, and an NSC grant. We thank the European Synchrotron Radiation Facility, Taiwan NSRRC, and Beijing Synchrotron Radiation Facility and Photon Factory for provision of synchrotron radiation facilities.Attached Files
Supplemental Material - ChenJ.SOM.pdf
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Additional details
- Eprint ID
- 52046
- DOI
- 10.1126/science.1125964
- Resolver ID
- CaltechAUTHORS:20141121-115203718
- KZCX3-SW-141
- Chinese Academy of Sciences
- 42432006
- National Science Foundation of China
- 40302004
- National Science Foundation of China
- 10490190
- National Science Foundation of China
- 60172042
- National Science Foundation of China
- 10490194
- National Science Foundation of China
- 111 Project
- 985-2
- Nanjing University
- Nanjing Institute of Geology & Paleontology
- NAG2-1541
- NASA
- National Science Council (Taipei)
- Created
-
2014-11-21Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field