In:
Science, American Association for the Advancement of Science (AAAS), Vol. 328, No. 5985 ( 2010-06-18), p. 1534-1539
Abstract:
In Drosophila , microRNAs (miRNAs) typically guide Argonaute1 to repress messenger RNA (mRNA), whereas small interfering RNAs (siRNAs) guide Argonaute2 to destroy viral and transposon RNA. Unlike siRNAs, miRNAs rarely form extensive numbers of base pairs to the mRNAs they regulate. We find that extensive complementarity between a target RNA and an Argonaute1-bound miRNA triggers miRNA tailing and 3′-to-5′ trimming. In flies, Argonaute2-bound small RNAs—but not those bound to Argonaute1—bear a 2′- O- methyl group at their 3′ ends. This modification blocks target-directed small RNA remodeling: In flies lacking Hen1, the enzyme that adds the 2′- O -methyl group, Argonaute2-associated siRNAs are tailed and trimmed. Target complementarity also affects small RNA stability in human cells. These results provide an explanation for the partial complementarity between animal miRNAs and their targets.
Type of Medium:
Online Resource
ISSN:
0036-8075
,
1095-9203
DOI:
10.1126/science.1187058
Language:
English
Publisher:
American Association for the Advancement of Science (AAAS)
Publication Date:
2010
detail.hit.zdb_id:
128410-1
detail.hit.zdb_id:
2066996-3
detail.hit.zdb_id:
2060783-0
SSG:
11
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