High impact information on Rnp4F

• RNA editing in Drosophila 4f-rnp gene nuclear transcripts by multiple A-to-G conversions [1].
• We show that only the non-edited sequence is present in wild-type fly chromosomes, and have conducted a genetic rescue experiment that suggests that the edited cDNA is expressed in a protein that partially complements a lethal 4f-rnp mutation [1].
• The sas-10 readthrough transcripts pair with 4f-rnp mRNA to form double-stranded molecules, as indicated by A-to-G editing observed in both RNA strands [2].
• The results show that 4f-rnp and (thus far) introns 7 and 8 are at least as old as order Odonata (dragonflies), an early-diverging insect line [3].
• These observations support a model in which frequently occurring cDNAs have led to numerous independent intron losses via homologous recombination/gene conversion during 4f-rnp gene evolution [3].

Biological context of Rnp4F

• RNA editing and regulation of Drosophila 4f-rnp expression by sas-10 antisense readthrough mRNA transcripts [2].
• The observation using quantitative RT-PCR that sas-10 readthrough and 4f-rnp transcript levels are inversely related suggests a role for the antisense RNA in posttranscriptional regulation of 4f-rnp gene expression during development [2].
• 4f-rnp and sas-10 are closely adjacent X-linked genes located on opposite DNA strands that produce convergent transcripts [2].
• The 4f-rnp gene contains eight small introns [4].
• RNA editing and alternative splicing generate mRNA transcript diversity from the Drosophila 4f-rnp locus [4].

Anatomical context of Rnp4F

• During embryogenesis, 4f-rnp transcripts are localized within cells of most tissues, but they have a very distinct localization pattern within the segmental ganglia of the central nervous system [5].

Other interactions of Rnp4F

• A potential editing substrate recognition element in 4f-rnp contains the weak consensus sequence: 5'-G-G-G-N-A-A-G-3', which may interact with double-stranded RNA adenosine deaminase following pairing of 4f-rnp mRNA with an antisense transcript [4].

Analytical, diagnostic and therapeutic context of Rnp4F

• Using tissue in situ hybridization techniques that do not distinguish between the transcripts, we find that the distribution of 4f-rnp mRNAs is specific to germline tissue in the ovary, demonstrating that these transcripts are maternally produced [5].
• We show that 4f-rnp is a single-copy gene by a combination of genomic Southern blot hybridization and restriction map analysis of clones isolated through chromosome walking techniques [5].

References