Click here to close Hello! We notice that you are using Internet Explorer, which is not supported by Xenbase and may cause the site to display incorrectly. We suggest using a current version of Chrome, FireFox, or Safari.
XB-ART-13552
Genetica 1998 Jan 01;1041:41-4. doi: 10.1023/a:1003475928921.
Show Gene links Show Anatomy links

Identification of enhancer-like elements in the ribosomal intergenic spacer of Odontophrynus americanus 2n and 4n (Amphibia, Anura).

Alvares LE , Brison O , Ruiz IR .


???displayArticle.abstract???
Repetitive elements are found in the ribosomal intergenic spacer (IGS) of most organisms. A particularly complex pattern of internal repetition occurs in the IGSs of O. americanus 2n and 4n, which are composed of several types of BamHI subrepeats (B-SRs). The most repetitive one is approximately 87 bp long, and is highly represented in the IGS variants of these amphibians. Sequence analyses of six diploid and two tetraploid B-SRs show 87% and 86% homology, respectively, and related secondary structure predictions. The comparison of the 2n and 4n B-SR sequences aligned with the 81 bp enhancer of Xenopus laevis reveals 36% homology. Furthermore, other B-SR features like size, number, and secondary structures resemble those of Xenopus enhancers, suggesting that B-SRs may function as regulators of O. americanus rDNA transcription. The present data also corroborate the close evolutionary relationship between 2n and 4n O. americanus species.

???displayArticle.pubmedLink??? 9949701
???displayArticle.link??? Genetica


Species referenced: Xenopus laevis
Genes referenced: sms