RT Journal Article
SR Electronic
T1 Growth retardation in a mouse model of Kabuki syndrome 2 bears mechanistic similarities to Kabuki syndrome 1
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 2023.10.15.562327
DO 10.1101/2023.10.15.562327
A1 Gao, Christine W
A1 Lin, Wan-Ying
A1 Riddle, Ryan C
A1 Chopra, Sheetal
A1 Boukas, Leandros
A1 Hansen, Kasper D
A1 Björnsson, Hans T
A1 Fahrner, Jill A
YR 2023
UL http://biorxiv.org/content/early/2023/10/16/2023.10.15.562327.abstract
AB Growth retardation is a characteristic feature of both Kabuki syndrome 1 (KS1) and Kabuki syndrome 2 (KS2), Mendelian disorders of the epigenetic machinery with similar phenotypes but distinct genetic etiologies. We previously described skeletal growth retardation in a mouse model of KS1 and further established that a Kmt2d−/− chondrocyte model of KS1 exhibits precocious differentiation. Here we characterized growth retardation in a mouse model of KS2, Kdm6atm1d/+. We show that Kdm6atm1d/+ mice have decreased femur and tibia length compared to controls and exhibit abnormalities in cortical and trabecular bone structure. Kdm6atm1d/+ growth plates are also shorter, due to decreases in hypertrophic chondrocyte size and hypertrophic zone height. Given these disturbances in the growth plate, we generated Kdm6a−/− chondrogenic cell lines. Similar to our prior in vitro model of KS1, we found that Kdm6a−/− cells undergo premature, enhanced differentiation towards chondrocytes compared to Kdm6a+/+ controls. RNA-seq showed that Kdm6a−/− cells have a distinct transcriptomic profile that indicates dysregulation of cartilage development. Finally, we performed RNA-seq simultaneously on Kmt2d−/−, Kdm6a−/−, and control lines at Days 7 and 14 of differentiation. This revealed surprising resemblance in gene expression between Kmt2d−/− and Kdm6a−/− at both time points and indicates that the similarity in phenotype between KS1 and KS2 also exists at the transcriptional level.Competing Interest StatementHTB is a consultant for Mahzi therapeutics. The other authors have no conflicts of interest.