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Fine chromosomal localization of the mouse Par2 gene that confers resistance against urethane-induction of pulmonary adenomas

Oncogene volume 20, pages 3979–3985 (2001)Cite this article

Abstract

BALB/cByJ mice are 14 times more resistant to urethane-induction of pulmonary adenomas than the susceptible A/J strain. Our previous linkage analysis of (A/J x BALB/cByJ)F1 x A/J backcross mice provided statistical evidence that a major resistance locus of BALB/cByJ with a dominant effect, designated Par2 (Pulmonary adenoma resistance 2), exists within an approximately 25 cM section of distal chromosome 18. To facilitate molecular identification of the Par2 locus, the present study was conducted to finely localize its chromosomal position utilizing Par2-congenic mice. Male BALB/cByJ mice were mated with female C57BL/6J mice carrying recessive Par2 alleles and their male F1 progeny were backcrossed to female BALB/cByJ mice. A male backcross mouse heterozygous within the Par2 interval of 25 cM was randomly selected and again backcrossed to female BALB/cByJ mice. This backcross-selection cycle was simply repeated to produce semi-congenic mice with a general BALB/cByJ genetic background except for the Par2 interval, where the mice were heterozygous with paternal C57BL/6J alleles and maternal BALB/cByJ alleles. After the 6th or 7th backcross, nine male mice possessing a recombination within the paternal Par2 interval were retained and crossed to female A/J mice. Resultant progeny were treated with urethane and examined for lung tumor development in order to deduce the Par2 genotypes of the recombinants through linkage analysis. By comparing the deduced Par2 genotype of each recombinant with its recombinational breakpoint, the Par2 locus was confined to an approximately 0.5 cM region flanked by D18Mit103 and D18Mit188 loci. Our results indicate that fully congenic mice conventionally established by at least nine simple backcrosses or by the speed congenic method are not necessarily required for fine mapping of quantitative trait loci. In the case of the Par2 locus, we found that semi-congenic mice after as few as four simple backcrosses were useful for this purpose. The map information obtained in this study should enable subsequent positional cloning of the Par2 gene.

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Abbreviations

C57BL:

C57BL/6J

C3H:

C3H/HeJ

BALB:

BALB/cByJ

Pas1 :

Pulmonary adenoma susceptibility 1

Par2 :

Pulmonary adenoma resistance 2

PCR:

polymerase chain reaction

A :

A/J allele.

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Acknowledgements

We thank Mr Tomoyuki Aoyagi, National Yakumo Hospital, Japan, for his technical assistance. This study was supported by grants from the Ministry of Education, Culture, Sports, Science and Technology, and the Ministry of Health and Welfare of Japan.

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Authors and Affiliations

  1. Department of Pathology, Toranomon Hospital and Okinaka Memorial Institute for Medical Research, Tokyo, 105-8470, Japan

    Gang-Hong Lee & Hiroshi Matsushita

  2. Department of Pathology, Cancer Institute, the Japanese Foundation for Cancer Research, Tokyo, 170-8455, Japan

    Tomoyuki Kitagawa

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  1. Gang-Hong Lee
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  2. Hiroshi Matsushita
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  3. Tomoyuki Kitagawa
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Correspondence to Gang-Hong Lee.

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Lee, GH., Matsushita, H. & Kitagawa, T. Fine chromosomal localization of the mouse Par2 gene that confers resistance against urethane-induction of pulmonary adenomas. Oncogene 20, 3979–3985 (2001). https://doi.org/10.1038/sj.onc.1204562

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