Addition of non-genomically encoded nucleotides to the 3'-terminus of maize mitochondrial mRNAs: Truncated rps12 mRNAs frequently terminate with CCA

Mark A. Williams, Yasuyo Johzuka, R. Michael Mulligan

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The 3'-termini of maize mitochondrial RNAs were characterized by ligation of an anchor oligonucleotide, reverse transcription and amplification. DNA sequence analysis of cDNA clones for tRNA(Ser) and 18S rRNA confirmed the expected 3'-terminal nucleotides and demonstrated the accuracy and fidelity of the protocol. Analysis of cDNAs for rps12, cox2 and atp9 indicated that non-genomically encoded nucleotides were present at the 3'-terminus. rps12 cDNAs exhibited the highest degree of modification, with 94% of 35 cDNA clones analyzed containing one to four non-genomically encoded C or A residues; 83% of these cDNAs terminated with the trinucleotide CCA. DNA sequence and transcript mapping analyses demonstrated that four positions exhibited modified 3'-termini within a small region of the 3' flank of rps12 transcripts. These transcript termini represented low abundance, truncated forms of rps12 mRNAs which may be intermediates in degradation. cox2 mRNAs are also modified at a truncated position. Sixty percent of the cox2 cDNAs were modified with 1-5 nt that most frequently included A and C residues, but also included a few G and T residues. Non-genomically encoded nucleotides were detected in 27% of the atp9 cDNAs as a single C or A residue.

Original languageEnglish
Pages (from-to)4444-4451
Number of pages8
JournalNucleic Acids Research
Volume28
Issue number22
DOIs
StatePublished - Nov 15 2000

ASJC Scopus subject areas

  • Genetics

Fingerprint

Dive into the research topics of 'Addition of non-genomically encoded nucleotides to the 3'-terminus of maize mitochondrial mRNAs: Truncated rps12 mRNAs frequently terminate with CCA'. Together they form a unique fingerprint.

Cite this