How keratin cortex thickness affects iridescent feather colours

Jeon, Deok-Jin; Ji, Seungmuk; Lee, Eun-Ok; Kang, Jihun; Kim, Jiyeong; D’Alba, Liliana; Manceau, Marie; Shawkey, Matthew D.; Yeo, Jong‐Souk

doi:10.1098/rsos.220786

Cited by 5 publications

(3 citation statements)

References 57 publications

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“…For instance, Quinn and Hews (2003) observed a significant increase in skin melaninization under the iris of blue skin, suggesting that melanin plays a crucial role in absorbing wavelengths other than blue. Similarly, Jeon et al (2023) discovered that keratin cortex thickness influences the main reflection peak of feather nanostructured melanosomes, resulting in a structural blue color. Notably, Prum et al (1994) found that non-iridescent green and blue skin colors in birds are produced by coherent scattering of dermal collagen fiber arrays in hexagonal tissues.…”

Section: Discussionmentioning

confidence: 99%

Transcriptome and proteome revealed the differences in 3 colors of earlobe in Jiangshan Black-bone chicken

Li,

Du,

et al. 2024

Poultry Science

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Section: Discussionmentioning

confidence: 99%

Transcriptome and proteome revealed the differences in 3 colors of earlobe in Jiangshan Black-bone chicken

Li,

Du,

et al. 2024

Poultry Science

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“…This can reveal hidden correlations among variables as starting points for more formal downstream hypothesis testing (e.g., pairwise correlation, chi-squared test). Variables included in our FAMD analysis related to the structural and optical properties of scatterers (summarized in Supplementary Table S1 ) from diverse eukaryotic groups (vertebrates, invertebrates and algae; Prum et al, 1999 ; Prum and Torres, 2004 ; Prum et al, 2004 ; Noh et al, 2010 ; Saenko et al, 2013 ; Teyssier et al, 2015 ; Gur et al, 2015a ; Gur et al, 2015b ; Gur et al, 2020 ; Chandler et al, 2015 ; Hsiung et al, 2015 ; Lopez-Garcia et al, 2018 ; Jeon et al, 2023 ; Surapaneni et al, 2024 ). FAMD analysis and plotting were performed using FactoMineR and Factoextra packages in R software version 4.2.2 ( Lê et al, 2008 ; Kassambara and Mundt, 2020 ; R Development Core Team, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

Intermediate filaments spatially organize intracellular nanostructures to produce the bright structural blue of ribbontail stingrays across ontogeny

Blumer,

Surapaneni,

Ciecierska-Holmes

et al. 2024

Front. Cell Dev. Biol.

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In animals, pigments but also nanostructures determine skin coloration, and many shades are produced by combining both mechanisms. Recently, we discovered a new mechanism for blue coloration in the ribbontail stingray Taeniura lymma, a species with electric blue spots on its yellow-brown skin. Here, we characterize finescale differences in cell composition and architecture distinguishing blue from non-blue regions, the first description of elasmobranch chromatophores and the nanostructures responsible for the stingray’s novel structural blue, contrasting with other known mechanisms for making nature’s rarest color. In blue regions, the upper dermis comprised a layer of chromatophore units —iridophores and melanophores entwined in compact clusters framed by collagen bundles— this structural stability perhaps the root of the skin color’s robustness. Stingray iridophores were notably different from other vertebrate light-reflecting cells in having numerous fingerlike processes, which surrounded nearby melanophores like fists clenching a black stone. Iridophores contained spherical iridosomes enclosing guanine nanocrystals, suspended in a 3D quasi-order, linked by a cytoskeleton of intermediate filaments. We argue that intermediate filaments form a structural scaffold with a distinct optical role, providing the iridosome spacing critical to produce the blue color. In contrast, black-pigmented melanosomes within melanophores showed space-efficient packing, consistent with their hypothesized role as broadband-absorbers for enhancing blue color saturation. The chromatophore layer’s ultrastructure was similar in juvenile and adult animals, indicating that skin color and perhaps its ecological role are likely consistent through ontogeny. In non-blue areas, iridophores were replaced by pale cells, resembling iridophores in some morphological and nanoscale features, but lacking guanine crystals, suggesting that the cell types arise from a common progenitor cell. The particular cellular associations and structural interactions we demonstrate in stingray skin suggest that pigment cells induce differentiation in the progenitor cells of iridophores, and that some features driving color production may be shared with bony fishes, although the lineages diverged hundreds of millions of years ago and the iridophores themselves differ drastically.

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“…The majority of the incoming light travels through the biopolymeric formations largely unhindered; nonetheless, a specific set of wavelengths (those with specific ratios to the size of the structure's periodic patterns) are selectively bounced back and generate angle-dependent iridescent shades found in various insects, birds, and marine creatures. Common examples of structural colors that appears in animals are peacock feathers [54][55][56][57], colorful birds [58][59][60][61], butterfly wings [62][63][64] and beetle exoskeletons [52,[65][66][67][68][69].…”

Section: Photonic Structures In Naturementioning

confidence: 99%

Mimicking Natural-Colored Photonic Structures with Cellulose-Based Materials

Quelhas,

Trindade

2023

Crystals

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Structural coloration has become a fascinating field of research, inspiring scientists and engineers to explore the vibrant colors observed in nature and develop bio-inspired photonic structures for various applications. Cellulose-based materials derived from plant fibers offer a promising platform for mimicking natural photonic structures. Their abundance, renewability, and versatility in form and structure make them ideal for engineering specific optical properties. Self-assembly techniques enable the creation of ordered, periodic structures at the nanoscale by manipulating the interactions between cellulose fibers through chemical modification or physical manipulation. Alternatively, additive manufacturing techniques like 3D printing and nanoimprint lithography can directly fabricate desired structures. By em-ulating natural photonic structures, cellulose-based materials hold immense potential for applications such as colorimetric sensors, optoelectronic devices, camouflage, and decorative materials. However, further research is needed to fully com-prehend and control their optical properties, as well as develop cost-effective and scalable manufacturing processes. This article presents a comprehensive review of the fundaments behind natural structural colors exhibited by living organisms and their bio-inspired artificial counterparts. Emphasis is placed on understanding the underlying mechanisms, strategies for tunability, and potential applications of these photonic nanostructures, with special focus on the utilization of cellulose nanocrystals (CNCs) for fabricating photonic materials with visible structural color. The challenges and future prospects of these materials are also discussed, highlighting the potential for advancements to unlock the full potential of cellulose-based materials with structural color.

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How keratin cortex thickness affects iridescent feather colours

Cited by 5 publications

References 57 publications

Transcriptome and proteome revealed the differences in 3 colors of earlobe in Jiangshan Black-bone chicken

Transcriptome and proteome revealed the differences in 3 colors of earlobe in Jiangshan Black-bone chicken

Intermediate filaments spatially organize intracellular nanostructures to produce the bright structural blue of ribbontail stingrays across ontogeny

Mimicking Natural-Colored Photonic Structures with Cellulose-Based Materials

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