Functional identification of the Plasmodium centromere and generation of a Plasmodium artificial chromosome.
The artificial chromosome represents a useful tool for gene transfer, both as cloning vectors and in chromosome biology research. To generate a Plasmodium artificial chromosome (PAC), we had to first functionally identify and characterize the parasite's centromere. A putative centromere (pbcen5) was cloned from chromosome 5 of the rodent parasite P. berghei based on a Plasmodium gene-synteny map. Plasmids containing pbcen5 were stably maintained in parasites during a blood-stage infection with high segregation efficiency, without drug pressure. pbcen5-containing plasmids were also stably maintained during parasite meiosis and mitosis in the mosquito. A linear PAC (L-PAC) was generated by integrating pbcen5 and telomere into a plasmid. The L-PAC segregated with a high efficiency and was stably maintained throughout the parasite's life cycle, as either one or two copies. These results suggest that L-PAC behaves like a Plasmodium chromosome, which can be exploited as an experimental research tool.
Mie University, School of Medicine, Tsu, Japan.
Shiroh
S
Iwanaga
Shahid M
SM
Khan
Izumi
I
Kaneko
Zoe
Z
Christodoulou
Chris
C
Newbold
Masao
M
Yuda
Chris J
CJ
Janse
Andrew P
AP
Waters
D002503:Centromere; D002875:Chromosomes; D022201:Chromosomes, Artificial; D003001:Cloning, Molecular; D005818:Genetic Engineering / Q000379:methods; D005822:Genetic Vectors; D005827:Genetics, Microbial / Q000379:methods; D010962:Plasmodium berghei / Q000235:genetics*