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. 1981 Oct;78(10):6003–6007. doi: 10.1073/pnas.78.10.6003

mRNA in human cells contains sequences complementary to the Alu family of repeated DNA.

B Calabretta, D L Robberson, A L Maizel, G F Saunders
PMCID: PMC348965  PMID: 6118863

Abstract

Approximately one-half of the polysomal poly(A)+RNA from CCRF-CEM human lymphoblastoid cells associates at low R0t (10 M.sec) [where R0 is the initial concentration of RNA (M) and t is time (sec)] to form branched complexes detectable by electron microscopy. The complexes typically involve 2-16 molecules associated over double-stranded regions 120 +/- 30 base pairs long. Formation of such complexes suggests that poly(A)+RNA contains repeated-sequence elements that are highly represented in the mRNA population. Hybridization of polysomal poly(A)+RNA with a recombinant human DNA plasmid, p lambda H15C, which is shown to contain at least three regions complementary to two different members of the Alu family of DNA repeat sequences, showed a total of five regions where R loops are formed. The hybridized regions comprising these groups are 260 +/- 180, 240 +/- 170, 150 +/- 70, 180 +/- 60, and 180 +/- 80 base pairs long. The relative frequencies of R loops formed at these different sites indicate that sequences in this recombinant DNA are represented in the mRNA population at different frequencies. The hybridizing sequence of the RNA molecules is located near one terminus in 13% of the R loops and internally in 53% of the R loops. Surprisingly, 35% of the R loops apparently involve RNA molecules hybridized over their entire length of only 200 +/- 110 base pairs.

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Selected References

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