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Vol. 11, Issue 1, 124-136, January 2001
METHODS
Efficient Male and Female Germline Transmission of a Human Chromosomal Vector in Mice
Thierry
Voet,1,4
Joris
Vermeesch,1,2,4
An
Carens,1
Joachim
Dürr,3
Charlotte
Labaere,1
Hein
Duhamel,1
Guido
David,3 and
Peter
Marynen1,5,6
1 Human Genome Laboratory, Leuven, Belgium;
2 Aventis CropScience, Ghent; 3 Laboratory for
Glycobiology and Developmental Genetics, Center for Human Genetics,
Flanders Interuniversity Institute for Biotechnology, University of
Leuven, B-3000 Leuven, Belgium
A small accessory chromosome that was mitotically stable in human
fibroblasts was transferred into the hprt
hamster cell line CH and developed as a human chromosomal vector (HCV)
by the introduction of a selectable marker and the 3' end of an
HPRT minigene preceded by a loxP sequence. This HCV
is stably maintained in the hamster cell line. It consists mainly of
alphoid sequences of human chromosome 20 and a fragment of human
chromosome region 1p22, containing the tissue factor gene F3.
The vector has an active centromere, and telomere sequences are
lacking. By transfecting a plasmid containing the 5' end of
HPRT and a Cre-encoding plasmid into the HCV+
hamster cell line, the HPRT minigene was reconstituted by
Cre-mediated recombination and expressed by the cells. The HCV was then
transferred to male mouse R1-ES cells and it did segregate properly.
Chimeras were generated containing the HCV as an independent chromosome in a proportion of the cells. Part of the male and female offspring of
the chimeras did contain the HCV. The HCV+ F1 animals
harbored the extra chromosome in >80% of the cells. The HCV was
present as an independent chromosome with an active centromere and the
human F3 gene was expressed from the HCV in a
human-tissue-specific manner. Both male and female F1 mice did transmit
the HCV to F2 offspring as an independent chromosome with properties
similar to the original vector. This modified small accessory
chromosome, thus, shows the properties of a useful chromosomal vector:
It segregates stably as an independent chromosome, sequences can be
inserted in a controlled way and are expressed from the vector, and the
HCV is transmitted through the male and female germline in mice.
4
These authors contributed equally to this work.
5
Present address: Center for Human Genetics, Flanders
Interuniversity Institute for Biotechnology, University of Leuven,
Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium.
6
Corresponding author.
11:124-136 ©2001 by Cold Spring Harbor Laboratory Press ISSN 1088-9051/01 $5.00

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