Tandemly repeated satellite DNA in the Artiodactyla - a lecture
Tandemly repeated, satellite, DNA sequences are an abundant component of the genome of most species, including the Artiodactyla. Multiple DNA familes are present, each in long tandem arrays, with members of each family present on one or more chromosomes at characteristic positions. In particular, several familes are located at the centromeres of most chromosomes, including acrocentrics, metacentrics and the sex chromosomes. Individual arrays are made up of variants of particular sequence motifs, which may be longer than 1,500 bp. In this presentation, we will discuss aspects of the evolution of repetitive sequences within and between chromosomes, with comparative data between different species. With pig, we will show details of the localization of tandem repeats at meiosis, and how these sequences relate to sequence amplification and loss, as well as the epigenetic behaviour of the resulting heterochromatin. In the Bovinae, we will show how molecular cytogenetic methods are essential to build up a full picture of the behaviour and distribution of satellite DNA where current sequencing methods are unable to assemble the sequences blocks accurately.
P. Heslop-Harrison1, T. Schwarzacher1 and R. Chaves2 (Phh4@le.ac.uk)
University of Leicester, Biology, Leicester LE1 7RH UK; 2Institute for Biotechnology and Bioengineering, Centre of Genomics and Biotechnology, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal