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The function of one-helix proteins (OHPs) in the thylakoid membrane remains poorly understood but may be linked to plant photosystem protection. In  Arabidopsis,  the 3'UTRs of the genes encoding OHP and OHP2 partially overlap with  NDP1  and  MES14  respectively. Antisense orientation of genes has the potential to form double-stranded transcript (dsRNA) molecules which can be processed to siRNA and trigger RNA interference (RNAi). Natural siRNAs are induced by abiotic and biotic stresses. We examined whether the expression of the  OHP-NDP1  and  OHP2-MES14  gene pairs is regulated in this way. Both  OHP  genes, but neither  NDP1  nor  MES14,  were activated by light in etiolated seedlings, whereas cold and prolonged heat treatment elevated the  OHP  transcript level. Expression of  OHP2  was down-regulated after 2 h of osmotic and heat stress, while salt and osmotic stress increased  MES14  transcript levels. No inverse regulation of these overlapping gene pairs was observed, excluding RNAi as a regulatory mechanism in the tested conditions. The presence of alternatively polyadenylat-ed transcripts of the studied genes raises the possibility of another regulatory mechanism of 3'UTR overlap.

Expression Patterns of Convergently Overlapping Arabidopsis Thaliana Gene Pairs OHP-NDP1 and OHP2-MES14