blastoderm
A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula.{{cite book|last1=Gilbert|first1=Scott F.|title=Developmental Biology |date=2000|publisher=Sinauer Associates|location=Sunderland MA|edition=6th |chapter=Early Drosophila Development |chapter-url=https://www.ncbi.nlm.nih.gov/books/NBK10081/ |id=NBK10081 |isbn=0-87893-243-7}} It encloses the fluid-filled blastocoel. Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm.{{cite web|title=blastoderm|url=https://medical-dictionary.thefreedictionary.com/blastoderm|website=The Free Dictionary|access-date=20 April 2018}}File:Blastula (PSF) en rotate 05.jpg
Formation
In [[oviparous]] animals
In chicken eggs, the blastoderm represents a flat disc after embryonic fertilization.{{cite web|title=Tutorial on chick early development|url=https://www.ucl.ac.uk/biosciences/departments/cdb/people/claudio-stern/stern_lab/tutorial|website=www.ucl.ac.uk|date=27 March 2019 |publisher=University College London|language=en}} At the edge of the blastoderm is the site of active migration by most cells.{{cite book|last1=Bellairs|first1=Ruth|last2=Osmond|first2=Mark|title=Atlas of Chick Development|publisher=Academic Press|pages=15–28|edition=3rd |chapter=3. Early Stages |chapter-url={{GBurl|JAjGAgAAQBAJ|p=15}} |date=2014 |isbn=978-0-12-384952-6 }}
DNA repair genes are highly expressed in chicken blastoderms.{{cite journal |vauthors=Rengaraj D, Won S, Jung KM, Woo SJ, Lee H, Kim YM, Kim H, Han JY |title=Chicken blastoderms and primordial germ cells possess a higher expression of DNA repair genes and lower expression of apoptosis genes to preserve their genome stability |journal=Sci Rep |volume=12 |issue=1 |pages=49 |date=January 2022 |pmid=34997179 |pmc=8741993 |doi=10.1038/s41598-021-04417-y |bibcode=2022NatSR..12...49R }}
See also
References
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- {{cite book |first1=Neil A. |last1=Campbell |first2=Jane B. |last2=Reece |title=Biology |publisher=Pearson Publishing |edition=7th |date=2005 |isbn=978-0-8053-7171-0 }}
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