Prenatal Diagnosis of Severe Mitochondrial Diseases Caused by Nuclear Gene Defects: A Study in Japan [post]

Nana Akiyama, Masaru Shimura, Taro Yamazaki, Hiroko Harashima, Takuya Fushimi, Tomoko Tsuruoka, Tomohiro Ebihara, Keiko Ichimoto, Ayako Matsunaga, Megumi Saito-Tsuruoka, Yukiko Yatsuka, Yoshihito Kishita (+7 others)
2020 unpublished
Background: Prenatal diagnoses of mitochondrial diseases caused by defects in nuclear DNA (nDNA) or mitochondrial DNA (mtDNA) have been reported in several countries except for Japan. The present study aimed to clarify the status of prenatal genetic diagnosis of mitochondrial diseases caused by nDNA defects in Japan. A comprehensive genomic analysis was performed to diagnose more than 400 patients, of which, 13 families (18 cases) had requested prenatal diagnoses. Results: Eight cases diagnosed
more » ... ght cases diagnosed with wild homozygous or heterozygous variants same as either of the heterozygous parents continued the pregnancy and delivered healthy babies. Another eight cases were diagnosed with homozygous, compound heterozygous, or hemizygous variants same as the proband. Of these, seven families chose to terminate the pregnancy, while one decided to continue the pregnancy.Conclusions: Neonatal- or infantile-onset mitochondrial diseases show severe phenotypes and lead to lethality. Therefore, such diseases could be candidates for prenatal diagnosis with careful genetic counseling, and prenatal testing could be a viable option for families.
doi:10.21203/rs.3.rs-93961/v1 fatcat:wwe7spabavbz5jtfzm76e5eojq