Genetic monitoring of immunegentic class-I major histocompatibility complex loci in BALB/c mice

Document Type : Full Research Paper

Authors

Razi Vaccine and serum research institute, Agricultural Reasearch, Education and Extention Organization (AREEO), Karaj, Iran

Abstract

Genetic quality control test is one of most important procedures in laboratory animal breeding. This study was aimed to monitor two immunogenic loci, H-2D and H-2K, in BALB/c inbred mouse strain. In this study, according to the FELASA recommendations, a total of 30 mice (15 male and 15 female) were randomly selected from the BALB/c colony. The animals were euthanized by Ketamine-Rampon, and the spleen tissue samples collected under sterile condition. Thereafter, total RNA was extracted and cDNA was synthezed using specific kites. In the current study, two DNA segments of 295 and 820 pb from H-2K and H-2D loci were amplified using specific primers and PCR method, respectively. The nucleoid differences between the sequenced samples were considered to identify alleles and haplotypes. The nucleoid sequences were determined using Sanger method and the primed sequences were then aligned and compared with the standard sequence of the BALB/c sequence as the reference. Results showed that 25 mice of 30 sampled mice had d allele in H-2K loci. In addition, four mice had sequences associated with k allele and one mouse showed mutant-d allele. Also, 25 mice of the 30 sampled mice showed complete identity with the d allele as the reference of H-2D BALB/c allele. However, three mice showed mutant-d allele, while the sequence of two mice did not show identity with d alleles. Moreover, among 30 investigated mice, 25 mice showed standard d haplotype of BALB/c strain. There was no significant difference between male and female mice regarding genetic contamination (P<0.05). These finding show that about 17% genetic contamination in the H-2K and H-2D loci of BALB/c colony which is probably related to single nucleotide mutation or uncontrolled mating. In conclusion, the results of the present study showed that approximately 83% of the BALB/c mice colonies were pure in H-2K and H-2D immunogenic loci.

Keywords


1- Amadou, C., A. Kumánovics, E. P. Jones, D. Lambracht‐Washington, M. Yoshino and K. F. Lindahl. 1999. The mouse major histocompatibility complex: some assembly required. Immunological Reviews 167: 211-221.
2- Bailey, D. W. 1959. Rates of subline divergence in highly inbred strains of mice. Journal of Heredity 50: 26-30.
3- Bailey, D. W. 1978. Sources of subline divergence and their relative importance for sublines of six major inbred strains of mice. 3rd  edition. Academic Press, 852.
4- Bailey, D. W. 1982. How pure are inbred strains of mice? Immunology Today 3: 210-214.
5- Benavides, F., T. Rülicke, J.-B. Prins, J. Bussell, F. Scavizzi, P. Cinelli, Y. Herault and D. Wedekind. 2019. Genetic quality assurance and genetic monitoring of laboratory mice and rats: FELASA Working Group Report. Laboratory Animals: 0023677219867719.
6- Cao, T. M., B. Lo, E. A. Ranheim, F. C. Grumet and J. A. Shizuru. 2003. Variable hematopoietic graft rejection and graft-versus-host disease in MHC-matched strains of mice. Proceedings of the National Academy of Sciences 100: 11571-11576.
7- Danchin, E., V. Vitiello, A. Vienne, O. Richard, P. Gouret, M. F. McDermott and P. Pontarotti. 2004. The major histocompatibility complex origin. Immunological Reviews 198: 216-232.
8- Fahey, J. R., H. Katoh, R. Malcolm and A. V. Perez. 2013. The case for genetic monitoring of mice and rats used in biomedical research. Mammalian Genome 24: 89-94.
9- Fox, J. G., S. Barthold, M. Davisson, C. E. Newcomer, F. W. Quimby and A. Smith. 2006. The Mouse in biomedical research diseases. Academic Press, 852.
10- Fox, J. L. 1983. Scientist sues over genetically impure mice. Science (New York, NY) 221: 625-628.
11- Kahan, B., R. Auerbach, B. J. Alter and F. H. Bach. 1982. Histocompatibility and isoenzyme differences in commercially supplied" BALB/c" mice. Science 217: 379-381.
12- Klebs, S. H., M. W. Hoffmann, P. B. Musholt, B. Bayer and T. J. Musholt. 2003. Detection of H-2 alleles by PCR-RFLP—an alternative to flow cytometry in the screening of transgenic mice. Journal of Immunological Methods 276: 197-205.
13- Petkov, P. M., M. A. Cassell, E. E. Sargent, C. J. Donnelly, P. Robinson, V. Crew, S. Asquith, R. V. Haar and M. V. Wiles. 2004. Development of a SNP genotyping panel for genetic monitoring of the laboratory mouse. Genomics 83: 902-911.
14- Strobel, M. C., L. G. Reinholdt, R. D. Malcolm and K. Pritchett-Corning. Section. 2015. Genetic monitoring of laboratory mice and ratsLaboratory Animal Medicine. Elsevier, 1403-1416.  
15- Sundberg, J., D. Boggess, L. Shultz and W. Beamer. 1994. The flaky skin (fsn) mutation, chromosome. CRC Press, Boca Raton, FL. p. 253-268.
16- Zurita, E., M. Chagoyen, M. Cantero, R. Alonso, A. González-Neira, A. López-Jiménez, J. A. López-Moreno, C. P. Landel, J. Benítez and F. Pazos. 2011. Genetic polymorphisms among C57BL/6 mouse inbred strains. Transgenic Research 20: 481-489