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Updated: Feb 22, 2026

An Integrated Approach for Microprotein Identification and Sequence Analysis
Published on: July 12, 2022
Prevalent Sequences in the Human Genome Can Form Mini i-Motif Structures at Physiological pH
Bartomeu Mir1,2, Israel Serrano3, Diana Buitrago4
1Inorganic and Organic Chemistry Department, Organic Chemistry Section, and IBUB, University of Barcelona , Martí i Franquès 1-11, 08028 Barcelona, Spain.
Abstract:
We report here the solution structure of several repetitive DNA sequences containing d(TCGTTCCGT) and related repeats. At physiological pH, these sequences fold into i-motif like quadruplexes in which every two repeats a globular structure is stabilized by two hemiprotonated C:C+ base pairs, flanked by two minor groove tetrads resulting from the association of G:C or G:T base pairs. The interaction between the minor groove tetrads and the nearby C:C+ base pairs affords a strong stabilization, which results in effective pHT values above 7.5. Longer sequences with more than two repeats are able to fold in tandem, forming a rosary bead-like structure. Bioinformatics analysis shows that these sequences are prevalent in the human genome, and are present in development-related genes.
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