PT  - JOURNAL ARTICLE
AU  - Roger Wellington-Oguri
AU  - Eli Fisker
AU  - Mat Zada
AU  - Michelle Wiley
AU  - Eterna Players
TI  - Evidence of an Unusual Poly(A) RNA Signature Detected by High-throughput Chemical Mapping
AID  - 10.1101/281147
DP  - 2018 Jan 01
TA  - bioRxiv
PG  - 281147
4099  - http://biorxiv.org/content/early/2018/05/14/281147.short
4100  - http://biorxiv.org/content/early/2018/05/14/281147.full
AB  - Homopolymeric adenosine RNA plays numerous roles in both cells and non-cellular genetic material, and for lack of evidence to the contrary, it is generally accepted to form a random coil under physiological conditions. However, chemical mapping data generated by the Eterna Massive Open Laboratory indicates that a poly (A) sequence of length seven or more, at pH 8.0 and MgCl concentrations of 10 mM, develops unexpected protection to selective 2’-hydroxyl acylation read out by primer extension (SHAPE) and dimethyl sulfate (DMS) chemical probing. This protection first appears in poly(A) sequences of length 7 and grows to its maximum strength at length ~10. In a long poly(A) sequence, substitution of a single A by any other nucleotide disrupts the protection, but only for the 6 or so nucleotides on the 5’ side of the substitution. The authors are grateful for pre-publication comments; please use https://docs.google.com/document/d/14972Q36IDTYMglwMXTOrqd4P9orQ6-P3bPbCuITdv6A.