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1 December 2006 Trp53 Affects the Developmental Anomaly of Clefts of the Palate in Irradiated Mouse Embryos but not Clefts of the Lip with or without the Palate
Shota Narai, Yasumitsu Kodama, Yoshitaka Maeda, Minesuke Yokoyama, Ritsuo Takagi, Ryo Kominami
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Abstract

Narai, S., Kodama, Y., Maeda, Y., Yokoyama, M., Takagi, R. and Kominami, R. Trp53 Affects the Developmental Anomaly of Clefts of the Palate in Irradiated Mouse Embryos but not Clefts of the Lip with or without the Palate. Radiat. Res. 166, 877–882 (2006).

Trp53-deficient mice exhibit increased incidences of developmental anomalies when irradiated, probably due to lack of Trp53-dependent apoptosis. A/J strain-derived CL/Fr mice develop clefts of the lip with or without the palate (CL/P) in approximately one-fifth of the embryos. We produced Trp53-deficient CL/Fr mice and examined the susceptibility to spontaneous development of CL/P and clefts of palate only (CPO), which differ in their developmental mechanisms, CL/P resulting from clefts of the primary palate and CPO from clefts of the secondary palate. The effect of radiation on the two phenotypes was also studied. Unexpectedly, no increase in the frequency of CL/P was observed under either condition, indicating that Trp53 deficiency does not contribute to genesis of CL/P. On the other hand, radiation enhanced the incidence of CPO in Trp53 / embryos but not in Trp53 /− and Trp53−/−/ embryos, suggesting that the absence or presence of only one allele of Trp53 is insufficient to hinder differentiation and proliferation of cells involved in the secondary palate formation. These results indicate that Trp53 function adversely affects the development of CPO when certain damaging agents such as radiation are given.

Shota Narai, Yasumitsu Kodama, Yoshitaka Maeda, Minesuke Yokoyama, Ritsuo Takagi, and Ryo Kominami "Trp53 Affects the Developmental Anomaly of Clefts of the Palate in Irradiated Mouse Embryos but not Clefts of the Lip with or without the Palate," Radiation Research 166(6), 877-882, (1 December 2006). https://doi.org/10.1667/RR0644.1
Received: 28 March 2006; Accepted: 1 June 2006; Published: 1 December 2006
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