RECURRENT POLYMORPHISMS IN SMALL CHROMOSOMES OF LEISHMANIA-TARENTOLAE AFTER NUTRIENT STRESS OR SUBCLONING

被引：45

作者：

ROVAI, L

TRIPP, C

STUART, K

SIMPSON, L

机构：

[1] UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024

[2] UNIV CALIF LOS ANGELES,INST MOLEC BIOL,LOS ANGELES,CA 90024

[3] SEATTLE BIOMED RES INST,SEATTLE,WA

来源：

MOLECULAR AND BIOCHEMICAL PARASITOLOGY | 1992年 / 50卷 / 01期

关键词：

LEISHMANIA-TARENTOLAE; POLYMORPHISM; NUTRIENT STRESS; SUBCLONING;

D O I：

10.1016/0166-6851(92)90249-J

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：

Molecular karyotypes of the UC, LEM87 and LEM115 Leishmania tarentolae strains were obtained. All strains had 24-28 chromosomal bands which varied in size between 300 kb and 2.9 Mb. Several recurrent chromosomal polymorphisms occurred in LEM115 after nutrient shock or subcloning. One type of polymorphism involves the truncation of a 365-kb chromosome which contains the miniexon genes. This specific chromosome breakage appears to be induced by the nutrient shock or subcloning process and also occurs spontaneously during routine passage. Another polymorphism is the appearance of a 90-kb minichromosome (115-SNA 1) after severe nutrient shock. This appears to be selection of a pre-existing cell type from a mosaic population. The 115-SNA 1 minichromosome has sequence homology with a minichromosome in LEM87 cells but shows no homology with any chromosomes in 115wt or other strains. The copy number of 115-SNA 1 varies with culture conditions, suggesting a relaxed centromeric control. The nature and origin of this minichromosome is not known.

引用

页码：115 / 126

页数：12

共 33 条

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