SICB Annual Meeting 2021
January 3-7, 2021
Washington, DC

Symposium S7: SICB-Wide Symposium - The integrative biology of pigment organelles
Twitter: #IBPO2021

Coloration is one of the most striking features of organisms in Nature. Colors mediate a vast array of biological functions, ranging from UV protection, camouflage to mating. Physical (i.e. structural) and chemical (i.e. pigmentary) processes are the two mechanisms underlying coloration. However, these two mechanisms are rarely independent; they function in concert to produce the infinite range of hues and brightness observable in Nature. Until recently, the molecular identification and characterization of pigments and photonic crystals, as well as the study of color patterns and their genetic bases, have been the main approaches for investigating coloration. In the last decades, research on an intermediary level of organization -the subcellular organelles- has led to exciting insight into the integrative biology of coloration. Subcellular organelles are indeed one of the main biological actors that bring together these physical and chemical processes. They are common sites of pigment deposition and photonic crystal formation, while their shape, sub-micrometric size and intracellular organization contribute to their optical activity by enhancing light absorption or diffraction. Many distantly-related organisms have evolved similar pigment organelles to perform identical biological functions, even though they may contain different types of pigments, crystals or they may be arranged in different manners within the cell. A comparative, multi-scale and interdisciplinary approach is hence required to understand the integrative biology of pigment organelles and to unravel the proximate, as well as the ultimate, causes of coloration.


Sponsors: DEE, DCPB, DEDB, DIZ, DEDE, DVM and DNNSB
American Microscopical Society


Organizers



Speakers



S7-1 Wed Jan 6, 10:15 Figon, F*; Casas, J; Deravi, L: Introduction to the symposium: The integrative biology of pigment organelles

S7-2 Wed Jan 6, 10:30 Reed, RD*; Brack, BJ: Origin of color in butterflies

S7-3 Wed Jan 6, 11:00 Shavit, K; Yallapragada, VJ; Weiner , S; Oron, D; Sagi, A; Addadi, L; Palmer, B*: Organic crystals in animal coloration and vision

S7-4 Wed Jan 6, 11:30 Morehouse, NI: Colors as life history traits: Insights from the pigment-based coloration of two butterfly species

S7-5 Wed Jan 6, 14:00 D'Alba, L*; Jeon, DJ; Yeo, JS; Manceau, M; Shawkey, MD: Optics and development of highly iridescent feathers: the case of hummingbird melanosomes

S7-6 Wed Jan 6, 14:30 Marks, MS: Melanosome protein contents and oculocutaneous albinism: The importance of remaining neutral

S7-7 Wed Jan 6, 15:00 Delevoye, C: BLOC-dependent regulation of melanocyte pigmentation and its defects in the Hermansky-Pudlak Syndromes

S7-8 Wed Jan 6, 16:00 Camacho, E*; Anglero-Rodriguez, Y; Smith, DFQ; Jacobs, E; Dong, Y; Cordero, RJB; Dimopoulos, G: Parallels of melanization in Cryptococcus neoformans and Anopheles gambiae

S7-9 Wed Jan 6, 16:30 Deravi, LF: Protein-pigment interactions facilitate dynamic color change in cephalopod chromatophores

S7-10 Wed Jan 6, 17:00 Figon, F*; Hurbain, I; Heiligenstein, X; Trépout, S; Medjoubi, K; Somogyi, A; Delevoye, C; Casas, J: Within-cell cycle of endolysosome-related pigment organelles in crab spiders leads to reversible color changes

S7-11 Wed Jan 6, 18:00 Wilts, BD: Rainbows in nature: disordered photonic structures tuned by pigments

S7-12 Wed Jan 6, 18:30 Llorente, B: Synthetic biogenesis of carotenoid-rich plastids for crop biofortification



Vertebrate melanosomes are the best-known and most studied pigment organelles. Their intracellular biogenesis involves four different pigmentation stages (arrows), whose study has shined a light on pigment organelle biology, as well as on numerous human pigmentation pathologies. Credits: Transmission electron micrographs taken from Patwardhan et al. (2018), Nature Communications. https://doi.org/10.1038/ncomms15835. CC BY.
A yellow crab spider (Misumena vatia) is ambushing pollinators on a yellow flower. This species is able to match its flower background through reversible color changes involving pigment organelles. Credits: Florent Figon. https://www.flickr.com/photos/ffigon/48138308287/in/dateposted/. CC BY SA.
Cephalopods are masters in the art of camouflage and rapid color changes. They do so by contracting and expanding intracellular saccules filed with pigment organelles of various colors. Credits: Betty Wills/Wikimedia. https://commons.wikimedia.org/wiki/File:Caribbean_Reef_Squid_colors.jpg. CC BY SA.
Melanosomes, the black pigment organelles of vertebrates, can be preserved in fossils (inset). In some cases, melanosomes can help reconstructing colors of extinct species. Credits: Photographs and scanning electron micrograph from McNamara et al. (2018), Nature Communications. https://doi.org/10.1038/s41467-018-05148-x. CC BY.