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| DATE | 2016-11-21 |
| FROM | Ruben Safir
|
| SUBJECT | Subject: [Learn] Fwd: [dinosaur] Eoconfuciusornis feather keratin and
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From learn-bounces-at-nylxs.com Mon Nov 21 22:08:41 2016
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Subject: [Learn] Fwd: [dinosaur] Eoconfuciusornis feather keratin and
melanosomes detected
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Found more feathers, like the Keritin, not fossil, from Dinosaur fossils
-------- Forwarded Message --------
Subject: [dinosaur] Eoconfuciusornis feather keratin and melanosomes
detected
Date: Mon, 21 Nov 2016 13:41:02 -0800
From: Ben Creisler
Reply-To: Ben Creisler
To: dinosaur-l-at-usc.edu
Ben Creisler
bcreisler-at-gmail.com
A new paper:
Yanhong Pan, Wenxia Zheng, Alison E. Moyer, Jingmai K. O=E2=80=99Connor, Mi=
n Wang,
Xiaoting Zheng, Xiaoli Wang, Elena R. Schroeter, Zhonghe Zhou, and Mary H.
Schweitzer (2016)
Molecular evidence of keratin and melanosomes in feathers of the Early
Cretaceous bird Eoconfuciusornis.
Proceedings of the National Academy of Sciences (advance online publication)
doi: 10.1073/pnas.1617168113
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.pnas.org_content_=
early_2016_11_16_1617168113.abstract-3Fsid-3D91906a2b-2Da658-2D4c64-2D9aa0-=
2Da211ab04a29f&d=3DDgIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=
=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DSCH7sbt63QaHY7P5YcpK1HmL=
C5rPvsty4oNY7yyP0yI&s=3D4tlvwtY57uB4s-ZV4JJws7JYa-q7DITYEMXKZeWJSGg&e=3D
Significance
We report fossil evidence of feather structural protein (beta-keratin) from
a 130-My-old basal bird (Eoconfuciusornis) from the famous Early Cretaceous
Jehol Biota, which has produced many feathered dinosaurs, early birds, and
mammals. Multiple independent molecular analyses of both microbodies and
associated matrix recovered from the fossil feathers confirm that these
microbodies are indeed melanosomes. We use transmission electron microscopy
and immunogold to show localized binding of antibodies raised against
feather protein to matrix filaments within these ancient feathers. Our work
sheds new light on molecular constituents of tissues preserved in fossils.
Abstract
Microbodies associated with feathers of both nonavian dinosaurs and early
birds were first identified as bacteria but have been reinterpreted as
melanosomes. Whereas melanosomes in modern feathers are always surrounded
by and embedded in keratin, melanosomes embedded in keratin in fossils has
not been demonstrated. Here we provide multiple independent molecular
analyses of both microbodies and the associated matrix recovered from
feathers of a new specimen of the basal bird Eoconfuciusornis from the
Early Cretaceous Jehol Biota of China. Our work represents the oldest
ultrastructural and immunological recognition of avian beta-keratin from an
Early Cretaceous (~130-Ma) bird. We apply immunogold to identify protein
epitopes at high resolution, by localizing antibody=E2=80=93antigen complex=
es to
specific fossil ultrastructures. Retention of original keratinous proteins
in the matrix surrounding electron-opaque microbodies supports their
assignment as melanosomes and adds to the criteria employable to
distinguish melanosomes from microbial bodies. Our work sheds new light on
molecular preservation within normally labile tissues preserved in fossils.
=3D=3D
News
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__phys.org_news_2016-2D=
11-2Dkeratin-2Dmelanosomes-2Dmillion-2Dyear-2Dold-2Dbird-2Dfossil.html&d=3D=
DgIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Y=
l9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DSCH7sbt63QaHY7P5YcpK1HmLC5rPvsty4oNY7yyP0yI=
&s=3DEpLph-sfE-JBK8dnl-3RtxgGuq29CLADfjj_KP6xopA&e=3D
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.scmp.com_news_chi=
na_policies-2Dpolitics_article_2047947_chinese-2Dfeather-2Dfossil-2Dsuggest=
s-2Danswer-2D130-2Dmillion-2Dyear&d=3DDgIFaQ&c=3DclK7kQUTWtAVEOVIgvi0NU5BOU=
HhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=3DSCH7s=
bt63QaHY7P5YcpK1HmLC5rPvsty4oNY7yyP0yI&s=3Dw-ZnYa-GQl4POnDMMF1eT-58v5gE4CuX=
8H4SerPFiAs&e=3D
https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.dailymail.co.uk_s=
ciencetech_article-2D3957800_Dinosaurs-2Dfinally-2Dtrue-2Dcolours-2DOldest-=
2Dred-2Dpigment-2D130-2Dmillion-2Dyear-2Dold-2Dfeather.html&d=3DDgIFaQ&c=3D=
clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=3DRy_mO4IFaUmGof_Yl9MyZgecRCK=
Hn5g4z1CYJgFW9SI&m=3DSCH7sbt63QaHY7P5YcpK1HmLC5rPvsty4oNY7yyP0yI&s=3DKAvM-1=
XC1BrFn4kWUfON4wil966h3WJ2hfYclSU_v4c&e=3D
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