[dinosaur] Avian flight feather bioarchitecture (free pdf)

Ben Creisler
[email protected]

A new paper with free pdf (for now):



Wei-Ling Chang, Hao Wu, Yu-Kun Chiu, Shuo Wang,Ting-Xin Jiang, Zhong-Lai
Luo, Yen-Cheng Lin, Ang Li, Jui-Ting Hsu, Heng-Li Huang, How-Jen Gu, Tse-Yu
Lin, Shun-Min Yang, Tsung-Tse Lee, Yung-Chi Lai, Mingxing Lei, Ming-You
Shie, Cheng-Te Yao, Yi-Wen Chen, J.C. Tsai, Shyh-Jou Shieh, Yeu-Kuang Hwu,
Hsu-Chen Cheng, Pin-Chi Tang, Shih-Chieh Hung, Chih-Feng Chen, Michael
Habib, Randall B. Widelitz, Ping Wu, Wen-Tau Juan & Cheng-Ming Chuong (2019)
The Making of a Flight Feather: Bio-architectural Principles and Adaptation.
Cell 179(6): P1409-1423.E17
DOI: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.cell.2019.11.008&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nOr-kN64LbWjI-S2Fm1G0r_otF-3MN9PETXrGfQ8654&s=kqZ3ITeJPyzdV90lYKEgIJzHTRYW-DBwY-tKEmZk_rE&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cell.com_cell_fulltext_S0092-2D8674-2819-2931229-2D2&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nOr-kN64LbWjI-S2Fm1G0r_otF-3MN9PETXrGfQ8654&s=NRdpz_D-rjVgmU2OCswK1i5ogmfy_HE9ndDIF0VwzSw&e= 

Free pdf:
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cell.com_action_showPdf-3Fpii-3DS0092-2D8674-252819-252931229-2D2&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nOr-kN64LbWjI-S2Fm1G0r_otF-3MN9PETXrGfQ8654&s=w240wCsZOofqjDufJMZ__CgAu1-AJLUta3OWgWuxLPA&e= 

Highlights

A cortex/medulla composite beam organization allows rachides to adapt
flexibly
Polarized adhesion and keratin expression lead to hooklet barbules that
form vanes
With-dermal papilla WNT signaling controls barbule shape along the feather
P-D axis
3D feathers embedded in amber show primitive vanes formed by overlapping
barbules

Summary

The evolution of flight in feathered dinosaurs and early birds over
millions of years required flight feathers whose architecture features
hierarchical branches. While barb-based feather forms were investigated,
feather shafts and vanes are understudied. Here, we take a
multi-disciplinary approach to study their molecular control and
bio-architectural organizations. In rachidial ridges, epidermal progenitors
generate cortex and medullary keratinocytes, guided by Bmp and transforming
growth factor β (TGF-β) signaling that convert rachides into adaptable
bilayer composite beams. In barb ridges, epidermal progenitors generate
cylindrical, plate-, or hooklet-shaped barbule cells that form fluffy
branches or pennaceous vanes, mediated by asymmetric cell junction and
keratin expression. Transcriptome analyses and functional studies show
anterior-posterior Wnt2b signaling within the dermal papilla controls
barbule cell fates with spatiotemporal collinearity. Quantitative
bio-physical analyses of feathers from birds with different flight
characteristics and feathers in Burmese amber reveal how multi-dimensional
functionality can be achieved and may inspire future composite material
designs.

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News:

https://urldefense.proofpoint.com/v2/url?u=https-3A__phys.org_news_2019-2D11-2Dfeathers-2Dpropel-2Dbirds-2Dair-2Dhistory.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=nOr-kN64LbWjI-S2Fm1G0r_otF-3MN9PETXrGfQ8654&s=Toax3UnhDyqFxSjjSrgHfxbr-MmH0szoNbGKx-YJFI4&e=