A heterochromatic satellite DNA is highly amplified in a single chromosome of Muscari (Hyacinthaceae)

被引：27

作者：

de la Herrán, R

Robles, F

Cuñado, N

Santos, JL

Rejón, MR

Garrido-Ramos, MA

Rejón, CR

机构：

[1] Univ Granada, Fac Ciencias, Dept Genet, E-18071 Granada, Spain

[2] Univ Complutense, Fac Biol, Dept Genet, E-28040 Madrid, Spain

来源：

CHROMOSOMA | 2001年 / 110卷 / 03期

关键词：

D O I：

10.1007/s004120000115

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

We examined the composition and evolution of a large heterochromatic region present in the genomes of certain species of the genus Muscari (Hyacinthaceae). We found that in Muscari comosum this heterochromatic region is composed mainly of a satellite DNA family, which we named MCSAT. Molecular analyses and in situ hybridization revealed that, through the evolution of Muscari species, the MCSAT sequences have been progressively amplified in several species of the genus, such as M. matritensis and M. dionysicum, attaining enormous amplification in the genome of M. comosum. We discuss the characteristics of this satellite DNA family, which, being exclusively amplified in one chromosome pair of M. comosum,, constitute the major exception to the equilocal model of satellite DNA and heterochromatin distribution. Also, we discuss the possibility that the amplification of these sequences in a single chromosome could have contributed to a progressive increase in the asymmetry of the karyotypes in Muscari species.

引用

页码：197 / 202

页数：6

共 28 条

[1]

ALFENITO MR, 1993, GENETICS, V135, P589

[2]

[Anonymous], 1988, Heterochromatin: Molecular an structural aspects

[3] DISTRIBUTION OF THE RDNA AND 3 CLASSES OF HIGHLY REPETITIVE DNA IN THE CHROMATIN OF INTERPHASE NUCLEI OF ARABIDOPSIS-THALIANA [J].