Abstract:
:In mammals, a subset of arginine tRNA isoacceptors are methylated in the anticodon loop by the METTL2 methyltransferase to form the 3-methylcytosine (m3C) modification. However, the mechanism by which METTL2 identifies specific tRNA arginine species for m3C formation as well as the biological role of m3C in mammals is unknown. Here, we show that human METTL2 forms a complex with DALR anticodon binding domain containing 3 (DALRD3) protein to recognize particular arginine tRNAs destined for m3C modification. DALRD3-deficient human cells exhibit nearly complete loss of the m3C modification in tRNA-Arg species. Notably, we identify a homozygous nonsense mutation in the DALRD3 gene that impairs m3C formation in human patients exhibiting developmental delay and early-onset epileptic encephalopathy. These findings uncover an unexpected function for the DALRD3 protein in the targeting of distinct arginine tRNAs for m3C modification and suggest a crucial biological role for DALRD3-dependent tRNA modification in proper neurological development.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Lentini JM,Alsaif HS,Faqeih E,Alkuraya FS,Fu Ddoi
10.1038/s41467-020-16321-6subject
Has Abstractpub_date
2020-05-19 00:00:00pages
2510issue
1issn
2041-1723pii
10.1038/s41467-020-16321-6journal_volume
11pub_type
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