RRC ID 52711
Author Satoh A, Mitogawa K, Saito N, Suzuki M, Suzuki KT, Ochi H, Makanae A.
Title Reactivation of larval keratin gene (krt62.L) in blastema epithelium during Xenopus froglet limb regeneration.
Journal Dev. Biol.
Abstract Limb regeneration is considered a form of limb redevelopment because of the molecular and morphological similarities. Forming a regeneration blastema is, in essence, creating a developing limb bud in an adult body. This reactivation of a developmental process in a mature body is worth studying. Xenopus laevis has a biphasic life cycle that involves distinct larval and adult stages. These distinct developmental stages are useful for investigating the reactivation of developmental processes in post-metamorphic frogs (froglets). In this study, we focused on the re-expression of a larval gene (krt62.L) during Xenopus froglet limb regeneration. Recently renamed krt62.L, this gene was known as the larval keratin (xlk) gene, which is specific to larval-tadpole stages. During limb regeneration in a froglet, krt62.L was re-expressed in a basal layer of blastema epithelium, where adult-specific keratin (Krt12.6.S) expression was also observable. Nerves produce important regulatory factors for amphibian limb regeneration, and also play a role in blastema formation and maintenance. The effect of nerve function on krt62.L expression could be seen in the maintenance of krt62.L expression, but not in its induction. When an epidermis-stripped limb bud was grafted in a froglet blastema, the grafted limb bud could reach the digit-forming stage. This suggests that krt62.L-positive froglet blastema epithelium is able to support the limb development process. These findings imply that the developmental process is locally reactivated in an postmetamorphic body during limb regeneration.
Volume 432(2)
Pages 265-272
Published 2017-12-15
DOI 10.1016/j.ydbio.2017.10.015
PII S0012-1606(17)30411-6
PMID 29079423
MeSH Animals Epithelium / metabolism Extremities / physiology Hindlimb / physiology Keratins / genetics* Keratins / metabolism* Larva / genetics Larva / physiology Regeneration / physiology* Xenopus Proteins / genetics Xenopus laevis / genetics
IF 3.262
Resource
Tropical clawed frog Xenopus tropicalis