RT Journal Article T1 Repeat Instability in the Fragile X-Related Disorders: Lessons from a Mouse Model. A1 Zhao, Xiaonan A1 Gazy, Inbal A1 Hayward, Bruce A1 Pintado, Elizabeth A1 Hwang, Ye Hyun A1 Tassone, Flora A1 Usdin, Karen K1 CGG Repeat Expansion Disease K1 DNA instability K1 Non-homologous end-joining (NHEJ) K1 base excision repair (BER) K1 contraction K1 double-strand break repair (DSBR) K1 expansion K1 mismatch repair (MMR) K1 mosaicism K1 transcription coupled repair (TCR) AB The fragile X-related disorders (FXDs) are a group of clinical conditions that result primarily from an unusual mutation, the expansion of a CGG-repeat tract in exon 1 of the FMR1 gene. Mouse models are proving useful for understanding many aspects of disease pathology in these disorders. There is also reason to think that such models may be useful for understanding the molecular basis of the unusual mutation responsible for these disorders. This review will discuss what has been learnt to date about mechanisms of repeat instability from a knock-in FXD mouse model and what the implications of these findings may be for humans carrying expansion-prone FMR1 alleles. SN 2076-3425 YR 2019 FD 2019-03-01 LK https://hdl.handle.net/10668/24724 UL https://hdl.handle.net/10668/24724 LA en DS RISalud RD Apr 17, 2025