ABSTRACT
Brain X-radiation for Childhood Epilepsy, Hydrocephalus or Mental Retardation? Research at Tuebingen University, 1940-1946 We reconstructed 65 cases out of a series of "experimental" X-ray-therapy by chart review and reanalysis of publications from a contextual historical perspective. The research procedures in the context of NS-pressure for effectiveness soon dismissed structured scientific procedures and surrendered own standards, whereas radiation impact did not transgress the contemporary guidelines.
Subject(s)
Cranial Irradiation/history , Epilepsy/history , Epilepsy/radiotherapy , Hospitals, University/history , Human Experimentation/history , Hydrocephalus/history , Hydrocephalus/radiotherapy , Intellectual Disability/history , Intellectual Disability/radiotherapy , National Socialism/history , Adolescent , Biomedical Research , Child , Child, Preschool , Germany , History, 20th Century , Humans , Infant , Radiotherapy DosageABSTRACT
Dubowitz Syndrome is an autosomal recessive disorder with a unique set of clinical features including microcephaly and susceptibility to tumor formation. Although more than 140 cases of Dubowitz syndrome have been reported since 1965, the genetic defects of this disease has not been identified. In this study, we systematically analyzed the DNA damage response and repair capability of fibroblasts established from a Dubowitz Syndrome patient. Dubowitz syndrome fibroblasts are hypersensitive to ionizing radiation, bleomycin, and doxorubicin. However, they have relatively normal sensitivities to mitomycin-C, cisplatin, and camptothecin. Dubowitz syndrome fibroblasts also have normal DNA damage signaling and cell cycle checkpoint activations after DNA damage. These data implicate a defect in repair of DNA double strand break (DSB) likely due to defective non-homologous end joining (NHEJ). We further sequenced several genes involved in NHEJ, and identified a pair of novel compound mutations in the DNA Ligase IV gene. Furthermore, expression of wild type DNA ligase IV completely complement the DNA repair defects in Dubowitz syndrome fibroblasts, suggesting that the DNA ligase IV mutation is solely responsible for the DNA repair defects. These data suggests that at least subset of Dubowitz syndrome can be attributed to DNA ligase IV mutations.
