Evolution of ribosomal DNA unit on the X chromosome independent of autosomal units in the liverwort Marchantia polymorpha

Autor:	Masaki, Fujisawa, Shigeki, Nakayama, Tomohisa, Nishio, Mariko, Fujishita, Kiwako, Hayashi, Kimitsune, Ishizaki, Masataka, Kajikawa, Katsuyuki T, Yamato, Hideya, Fukuzawa, Kanji, Ohyama
Rok vydání:	2003
Předmět:	Hepatophyta Blotting Southern Genome X Chromosome Models Genetic Nucleic Acid Hybridization DNA Ribosomal Polymerase Chain Reaction Chromosomes Conserved Sequence In Situ Hybridization Fluorescence Gene Library
Zdroj:	Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology. 11(7)
ISSN:	0967-3849
Popis:	In the haploid dioecious liverwort, Marchantia polymorpha, the X chromosome, but not the Y, carries a cluster of ribosomal RNA genes (rDNAs). Here we show that sequences of 5S, 17S, 5.8S and 26S rDNAs are highly conserved (99% identity) between the X chromosomal and autosomal rDNA repeat units, but the intergenic spacer sequences differ considerably. The most prominent difference is the presence of a 615-bp DNA fragment in the intergenic spacer, X615, which has accumulated predominantly in the rDNA cluster of the X chromosome. These observations suggest that the rDNA repeat unit on the X chromosome evolved independently of that on autosomes, incorporating sex chromosome-specific sequences.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::277f3ec6ff9988ac436cada3dd585663 https://pubmed.ncbi.nlm.nih.gov/14606631 Zobrazit plný text záznamu Full text from SpringerLink