Rampant Nuclear Transfer and Substitutions of Plastid Genes in Passiflora.

Genome Biology and Evolution
Bikash ShresthaRobert K Jansen

Abstract

Gene losses in plastid genomes (plastomes) are often accompanied by functional transfer to the nucleus or substitution of an alternative nuclear-encoded gene. Despite the highly conserved gene content in plastomes of photosynthetic land plants, recent gene loss events have been documented in several disparate angiosperm clades. Among these lineages, Passiflora lacks several essential ribosomal genes, rps7, rps16, rpl20, rpl22, and rpl32, the two largest plastid genes, ycf1 and ycf2, and has a highly divergent rpoA. Comparative transcriptome analyses were performed to determine the fate of the missing genes in Passiflora. Putative functional transfers of rps7, rpl22, and rpl32 to nucleus were detected, with the nuclear transfer of rps7, representing a novel event in angiosperms. Plastid-encoded rps7 was transferred into the intron of a nuclear-encoded plastid-targeted thioredoxin m-type gene, acquiring its plastid transit peptide (TP). Plastid rpl20 likely experienced a novel substitution by a duplicated, nuclear-encoded mitochondrial-targeted rpl20 that has a similar gene structure. Additionally, among rosids, evidence for a third independent transfer of rpl22 in Passiflora was detected that gained a TP from a nuclear gene cont...Continue Reading

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Citations

Mar 7, 2021·International Journal of Molecular Sciences·Bikash ShresthaRobert K Jansen
Apr 4, 2021·Scientific Reports·Aldanah A Alqahtani, Robert K Jansen
May 23, 2021·The Plant Journal : for Cell and Molecular Biology·Chaehee LeeTracey A Ruhlman

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Methods Mentioned

BETA
electrophoresis
DNA
PCR

Software Mentioned

Trim Galore
Geneious Blast
Trinity
Geneious
mapper
Blastp
CODEML
LOCALIZER
tBlastn
Blastn

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