Fine Mapping of Xq28: Both MECP2/IRAK1 and NAA10/RENBP Contribute to Risk for SLE in Multiple Ancestral Groups
ARTHRITIS AND RHEUMATISM
Authors: Kaufman, Kenneth M.; Kelly, Jennifer A.; Hughes, Travis; Adler, Adam; Sanchez, Elena; Ojwang, Joshua O.; Langefeld, Carl D.; Ziegler, Julie T.; James, Judith A.; Brown, Elizabeth E.; Kimberly, Robert P.; Edberg, Jeffrey C.; Criswell, Lindsey A.; Chang, Deh-Ming; Gilkeson, Gary S.; Niewold, Timothy B.; Bae, Sang-Cheol; Alarcon-Riquelme, Marta E.; Jacob, Chaim O.; Moser, Kathy L.; Gaffney, Patrick M.; Harley, John B.; Sawalha, Amr H.; Tsao, Betty P.
Abstract
The Role of N-alpha-acetyltransferase 10 Protein in DNA Methylation and Genomic Imprinting
MOLECULAR CELL
Authors: Lee, Chen-Cheng; Peng, Shih-Huan; Shen, Li; Lee, Chung-Fan; Du, Ting-Huei; Kang, Ming-Lun; Xu, Guo-Liang; Upadhyay, Anup K.; Cheng, Xiaodong; Yan, Yu-Ting; Zhang, Yi; Juan, Li-Jung
Abstract
Genomic imprinting is an allelic gene expression phenomenon primarily controlled by allele-specific DNA methylation at the imprinting control region (ICR), but the underlying mechanism remains largely unclear. N-alpha-acetyltransferase 10 protein (Naa10p) catalyzes N-alpha-acetylation of nascent proteins, and mutation of human Naa10p is linked to severe developmental delays. Here we report that Naa10-null mice display partial embryonic lethality, growth retardation, brain disorders, and maternal effect lethality, phenotypes commonly observed in defective genomic imprinting. Genome-wide analyses further revealed global DNA hypomethylation and enriched dysregulation of imprinted genes in Naa10p-knockout embryos and embryonic stem cells. Mechanistically, Naa10p facilitates binding of DNA methyltransferase 1 (Dnmt1) to DNA substrates, including the ICRs of the imprinted allele during S phase. Moreover, the lethal Ogden syndrome-associated mutation of human Naa10p disrupts its binding to the ICR of H19 and Dnmt1 recruitment. Our study thus links Naa10p mutation-associated Ogden syndrome to defective DNA methylation and genomic imprinting.