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Example sentences for: let-
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Although complementary sites for both miRNAs are found in the 3' UTRs of several putative nematode targets, these miRNAs are not physically linked in the C. elegans genome and their mutant phenotypes are principally due to misregulation of different transcripts [ 4 5 6 8 ] . The function of these miRNAs has not yet been explicitly demonstrated in other species, but Drosophila let-7 is regulated at the larval-pupal transition by ecdysone [ 49 ] , and all three members of this cluster are present in other insects and in vertebrates, thus implying broadly conserved functions.
Another notable cluster that includes previously identified miRNAs is one containing mir-100 , let-7 and mir-125 (Figure 7c).
This contrasts with observations of miRNAs in vertebrates, where the majority of known miRNAs are members of paralogous gene sets [ 31 ] . The most extreme examples of this disparity are let-7 and mir-29 , which are present in single copies in Drosophila , but are represented by thirteen and six distinct human homologs, respectively.
For example, 41% of miRNAs cloned from HeLa cells are variants of let-7, 28% of human brain miRNAs are variants of miR-124, and 45% of miRNAs cloned from human heart and 32% of those cloned from early Drosophila embryos are miR-1 [ 10 29 ] . In fact, it has been opined that few additional mammalian miRNAs will be easily identified by the direct cloning method [ 30 ] .
Our observation that the temporal expression profile of miR-100 (Figure 5d) is similar to that described for let-7 and miR-125 (that is, expression is initiated during larval/pupal development and continues through adulthood [ 9 29 ] ) is consistent with probable coordinate expression of all three as a single pri-miRNA transcript, and may further implicate miR-100 in developmental timing.
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