Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Mouse eosinophil-associated ribonucleases: a unique subfamily expressed during hematopoiesis

Mouse eosinophil-associated ribonucleases: a unique subfamily expressed during hematopoiesis A unique family of ribonucleases was identified by exhaustive screening of genomic and cDNA libraries using a probe derived from a gene encoding a ribonuclease stored in the mouse eosinophil secondary granule. This family contains at least 13 genes, which encode ribonucleases, and two potential pseudogenes. The conserved sequence identity among these genes (∼70%), as well as the isolation/purification of these ribonucleases from eosinophil secondary granules, has led us to conclude that these genes form a unique clade in the mouse that we have identified as the Ear (Eosinophil-associated ribonuclease) gene family. Analyses of the nucleotide substitutions that have occurred among these ribonuclease genes reveal that duplication events within this family have been episodic, occurring within three unique periods during the past 18 × 106 years. Moreover, comparisons of non-synonymous (Ka) vs. synonymous (Ks) rates of nucleotide substitution show that although these genes conserve residues necessary for RNase activity, selective evolutionary pressure(s) exist such that acquired amino acid changes appear to be advantageous. The selective advantage of these amino acid changes is currently unclear, but the occurrence of this phenomenon in both the mouse and the human highlights the importance of these changes for Ear and, therefore, eosinophil effector function(s). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mammalian Genome Springer Journals

Mouse eosinophil-associated ribonucleases: a unique subfamily expressed during hematopoiesis

Download PDF
10 pages

Loading next page...
1
 
/lp/springer_journal/mouse-eosinophil-associated-ribonucleases-a-unique-subfamily-expressed-95cK5F3GI2

References (48)

Publisher
Springer Journals
Copyright
Copyright © 2001 by Springer-Verlag New York Inc.
Subject
Life Sciences; Cell Biology; Animal Genetics and Genomics; Human Genetics
ISSN
0938-8990
eISSN
1432-1777
DOI
10.1007/s003350020007
pmid
11331942
Publisher site
See Article on Publisher Site

Abstract

A unique family of ribonucleases was identified by exhaustive screening of genomic and cDNA libraries using a probe derived from a gene encoding a ribonuclease stored in the mouse eosinophil secondary granule. This family contains at least 13 genes, which encode ribonucleases, and two potential pseudogenes. The conserved sequence identity among these genes (∼70%), as well as the isolation/purification of these ribonucleases from eosinophil secondary granules, has led us to conclude that these genes form a unique clade in the mouse that we have identified as the Ear (Eosinophil-associated ribonuclease) gene family. Analyses of the nucleotide substitutions that have occurred among these ribonuclease genes reveal that duplication events within this family have been episodic, occurring within three unique periods during the past 18 × 106 years. Moreover, comparisons of non-synonymous (Ka) vs. synonymous (Ks) rates of nucleotide substitution show that although these genes conserve residues necessary for RNase activity, selective evolutionary pressure(s) exist such that acquired amino acid changes appear to be advantageous. The selective advantage of these amino acid changes is currently unclear, but the occurrence of this phenomenon in both the mouse and the human highlights the importance of these changes for Ear and, therefore, eosinophil effector function(s).

Journal

Mammalian Genome – Springer Journals

Published: May 1, 2001

There are no references for this article.