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- W3128139904 abstract "Rattlesnake's venom constitutes an important ecological trait that dynamically changes over time. Venoms of adult and juvenile rattleless rattlesnakes, Crotalus catalinensis , an endemic insular species from the Gulf of California, were compared by electrophoretic profile, fibrinogenolytic activity, and proteomic composition to assess ontogenetic variability. The SDS-PAGE profiles show important differences at 12, 22, and 45 kDa, which were prominent in adult samples and absent in juvenile samples, while bands around 20, 25, and 70 kDa are almost absent in adults. Both venoms hydrolyze Aa and Bb chains of fibrinogen generating different patterns of degradation products. This activity was partially inhibited by EDTA and PMSF and completely abolished only in the presence of both inhibitors. More than 260 proteins were identified and quantified in both venoms by proteomic analysis. Metalloproteinases (more than 60%), serine proteinases (14.5% in adult venom and 17.7% in juvenile venom), and C-type lectins (7.1 and 5.9%) represent the three most abundant toxin-related protein families. Bradykinin inhibitor peptides and L-amino acid oxidases were not detected in juvenile venom. A protein-specific comparison shows that adult and juvenile venom share about 30.5% of total toxin-related proteins, while 32% and 35% are exclusively present in adult and juvenile venoms, respectively. This work represents one of the first efforts to understand phenotypic diversity in the venom composition of insular rattlesnake species from Mexico. • First venomic analysis for a Crotalus microendemic population of one island ( Crotalus catalinensis ). • Venoms differ on its electrophoretic profile either in reduced and non-reduced conditions. • Both venoms hydrolyze alpha and beta chains of Fibrinogen generating different patterns of degradation products. • Metalloproteases, serine proteases and C-type Lectins are the three more abundant toxins in juvenile and adult samples. • More than 260 protein sequences were identified from which only 30% are shared by both venoms. The ontogenetic variation of the venom may explain efficiency in the capture of prey, especially in juveniles, which have a lower volume of venom than adults. The proteomic analysis of these venoms allows us to obtain a detailed catalog of the secreted toxins, which enables us to understand their biological effects better. The analysis of C. catalinensis venom showed ontogenetic variation in its composition, which could be explained by the difference in the diet of adults and juveniles." @default.
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- W3128139904 date "2021-04-01" @default.
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- W3128139904 title "Proteomic comparison of adult and juvenile Santa Catalina rattlesnake (Crotalus catalinensis) venom" @default.
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- W3128139904 doi "https://doi.org/10.1016/j.toxicon.2021.01.014" @default.
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