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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Function and position determine relative proportions of different fiber types in limb muscles of the lizard Tropidurus psammonastes

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Author(s):
Pereira, Anieli G. [1, 2] ; Abdala, Virginia [3] ; Kohlsdorf, Tiana [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, FFCLRP, Dept Biol, Ribeirao Preto, SP - Brazil
[2] Univ Fed Rio de Janeiro, Dept Genet, Rio De Janeiro, RJ - Brazil
[3] Consejo Nacl Invest Cient & Tecn, Inst Biodiversidad Neotrop, San Miguel De Tucuman - Argentina
Total Affiliations: 3
Document type: Journal article
Source: ZOOLOGY; v. 118, n. 1, p. 27-33, FEB 2015.
Web of Science Citations: 3
Abstract

Skeletal muscles can be classified as flexors or extensors according to their function, and as dorsal or ventral according to their position. The latter classification evokes their embryological origin from muscle masses initially divided during limb development, and muscles sharing a given position do not necessarily perform the same function. Here, we compare the relative proportions of different fiber types among six limb muscles in the lizard Tropidurus psammonastes. Individual fibers were classified as slow oxidative (SO), fast glycolytic (FG) or fast oxidative-glycolytic (FOG) based on mitochondrial content; muscles were classified according to position and function. Mixed linear models considering one or both effects were compared using likelihood ratio tests. Variation in the proportion of FG and FOG fibers is mainly explained by function (flexor muscles have on average lower proportions of FG and higher proportions of FOG fibers), while variation in SO fibers is better explained by position (they are less abundant in ventral muscles than in those developed from a dorsal muscle mass). Our results clarify the roles of position and function in determining the relative proportions of the various muscle fibers and provide evidence that these factors may differentially affect distinct fiber types. (C) 2014 Published by Elsevier GmbH. (AU)

FAPESP's process: 12/51012-6 - Design and physiology compared between two of the most specious families of neotropical lizards: Liolaemidae versus Tropiduridae
Grantee:Tiana Kohlsdorf
Support Opportunities: Regular Research Grants