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Radiation induction of germline mutation at a hypervariable mouse minisatellite locus
S Sadamoto1, S Suzuki, K Kamiya
1Department of Pathology, Hiroshima University, Japan.
International Journal of Radiation Biology
|May 1, 1994
Summary
Paternal gamma irradiation significantly increased germline mutation rates in mice at the Ms6hm locus, particularly in spermatids. This suggests an unexpected mechanism for radiation-induced genetic damage in reproductive cells.
Area of Science:
- Radiation Biology
- Genetics
- Molecular Biology
Background:
- Paternal irradiation effects on germline mutation are crucial for understanding heritable genetic damage.
- Minisatellite loci, like Ms6hm, are sensitive indicators of genomic instability.
Purpose of the Study:
- To investigate the induction of germline mutations at the mouse Ms6hm locus following paternal gamma irradiation.
- To assess mutation frequencies across different male germ cell stages (spermatozoa, spermatids, spermatogonia).
Main Methods:
- Male mice (C3H/HeN and C57BL/6N) were exposed to 3 Gy of 60Co gamma-ray.
- Mating occurred at specific intervals post-irradiation to sample different germ cell stages.
- Southern analysis was used to detect mutations at the Ms6hm locus in parent and F1 offspring DNA.
Main Results:
- A statistically significant increase in paternal germline mutation frequency was observed in C3H/HeN spermatids (p < 0.005).
- Induced mutation frequencies were high (order of 10^-1), suggesting mechanisms beyond direct radiation action.
- The Ms6hm locus proved sensitive to radiation-induced genetic damage in germline cells.
Conclusions:
- Paternal gamma irradiation can induce germline mutations through a potentially novel mechanism.
- The Ms6hm hypervariable minisatellite locus is a valuable tool for monitoring radiation-induced genetic damage in germ cells.