Arthropod 7SK RNA.

@article{Gruber2008Arthropod7R,
  title={Arthropod 7SK RNA.},
  author={Andreas R. Gruber and Carsten Kilgus and Axel Mosig and Ivo L. Hofacker and Wolfgang Hennig and Peter F. Stadler},
  journal={Molecular biology and evolution},
  year={2008},
  volume={25 9},
  pages={
          1923-30
        }
}
The 7SK small nuclear RNA (snRNA) is a key player in the regulation of polymerase (pol) II transcription. The 7SK RNA was long believed to be specific to vertebrates where it is highly conserved. Homologs in basal deuterostomes and a few lophotrochozoan species were only recently reported. On longer timescales, 7SK evolves rapidly with only few conserved sequence and structure motifs. Previous attempts to identify the Drosophila homolog thus have remained unsuccessful despite considerable… 
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Evolution of 7SK RNA and its protein partners in metazoa.
TLDR
An improved secondary structure model of 7SK RNA is derived, which shows that the structure is quite well-conserved across animal phyla despite the extreme divergence at sequence level.
Detailed secondary structure models of invertebrate 7SK RNAs
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A systematic homology search extended the collection of 7SK genes in both Arthropods and Lophotrochozoa making use of the large number of recently published invertebrates genomes to infer complete consensus structures for invertebrate 7SK RNAs.
An alternative D. melanogaster 7SK snRNP
TLDR
It is proposed that two distinct 7SK genes might contribute to the formation of the 7SK snRNP complex in D. melanogaster and it is shown that, like dm7SK, this alternative 7SK interacts in vivo with the different partners of the P-TEFb complex.
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A comprehensive survey of this ncRNA family in the phylum Nematoda is reported, finding 240 new sbRNAs that show the characteristic Ro protein binding motif, and contain a region highly similar to a functionally required motif for DNA replication previously thought to be unique to vertebrate Y RNAs.
Intermolecular recognition of the non-coding RNA 7SK and HEXIM protein in perspective.
Structured non-coding RNAs and the RNP Renaissance.
The Drosophila 7SK snRNP and the essential role of dHEXIM in development
TLDR
It is shown that an RNA previously suggested to be a 7SK homolog is, in fact, associated with P-TEFb, through the action of a homolog of the human HEXIM1/2 proteins (dHEXIM).
The crystal structure of the 5΄ functional domain of the transcription riboregulator 7SK
TLDR
The present structural analysis of 7SK HP1 highlights an original mechanism of swapping bases, which could represent a possible ‘7SK signature’ and provides new insight into the functional importance of the plasticity of RNA.
7SK RNA, a non-coding RNA regulating P-TEFb, a general transcription factor
TLDR
Human 7SK RNA is an abundant 331nt nuclear transcript generated by RNA polymerase III and is a paradigm for non-coding RNAs regulating transcription.
Temperature-Dependent Structural Variability of RNAs: spliced Leader RNAs and their Evolutionary History
TLDR
Striking similarities are observed among Euglenida, Kinetoplastida, Dinophyceae, Cnidaria, Rotifera, Nematoda, Platyhelminthes, and Tunicata that cannot be explained easily by the independent innovation of SL RNAs in each of these phyla.
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