Selaginella moellendorffii has a reduced and highly conserved expansin superfamily with genes more closely related to angiosperms than to bryophytes

Robert E. Carey, Nathan K. Hepler, Daniel J. Cosgrove

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Background: Expansins are plant cell wall loosening proteins encoded by a large superfamily of genes, consisting of four families named EXPA, EXPB, EXLA, and EXLB. The evolution of the expansin superfamily is well understood in angiosperms, thanks to synteny-based evolutionary studies of the gene superfamily in Arabidopsis, rice, and Populus. Analysis of the expansin superfamily in the moss Physcomitrella patens revealed a superfamily without EXLA or EXLB genes that has evolved considerably and independently of angiosperm expansins. The sequencing of the Selaginella moellendorffii genome has allowed us to extend these analyses into an early diverging vascular plant.Results: The expansin superfamily in Selaginella moellendorffii has now been assembled from genomic scaffolds. A smaller (and less diverse) superfamily is revealed, consistent with studies of other gene families in Selaginella. Selaginella has an expansin superfamily, which, like Physcomitrella, lacks EXLA or EXLB genes, but does contain two EXPA genes that are related to a particular Arabidopsis-rice clade involved in root hair development.Conclusions: From sequence-based phylogenetic analysis, most Selaginella expansins lie outside the Arabidopsis-rice clades, leading us to estimate the minimum number of expansins present in the last common ancestor of Selaginella and angiosperms at 2 EXPA genes and 1 EXPB gene. These results confirm Selaginella as an important intermediary between bryophytes and angiosperms.

Original languageEnglish (US)
Article number4
JournalBMC Plant Biology
Volume13
Issue number1
DOIs
StatePublished - Jan 3 2013

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Selaginella
expansins
Angiospermae
genes
Arabidopsis
rice
Physcomitrella
Physcomitrella patens
Bryophyta
root hairs
Populus
vascular plants
mosses and liverworts
ancestry
cell walls
genomics
genome
phylogeny

All Science Journal Classification (ASJC) codes

  • Plant Science

Cite this

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title = "Selaginella moellendorffii has a reduced and highly conserved expansin superfamily with genes more closely related to angiosperms than to bryophytes",
abstract = "Background: Expansins are plant cell wall loosening proteins encoded by a large superfamily of genes, consisting of four families named EXPA, EXPB, EXLA, and EXLB. The evolution of the expansin superfamily is well understood in angiosperms, thanks to synteny-based evolutionary studies of the gene superfamily in Arabidopsis, rice, and Populus. Analysis of the expansin superfamily in the moss Physcomitrella patens revealed a superfamily without EXLA or EXLB genes that has evolved considerably and independently of angiosperm expansins. The sequencing of the Selaginella moellendorffii genome has allowed us to extend these analyses into an early diverging vascular plant.Results: The expansin superfamily in Selaginella moellendorffii has now been assembled from genomic scaffolds. A smaller (and less diverse) superfamily is revealed, consistent with studies of other gene families in Selaginella. Selaginella has an expansin superfamily, which, like Physcomitrella, lacks EXLA or EXLB genes, but does contain two EXPA genes that are related to a particular Arabidopsis-rice clade involved in root hair development.Conclusions: From sequence-based phylogenetic analysis, most Selaginella expansins lie outside the Arabidopsis-rice clades, leading us to estimate the minimum number of expansins present in the last common ancestor of Selaginella and angiosperms at 2 EXPA genes and 1 EXPB gene. These results confirm Selaginella as an important intermediary between bryophytes and angiosperms.",
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Selaginella moellendorffii has a reduced and highly conserved expansin superfamily with genes more closely related to angiosperms than to bryophytes. / Carey, Robert E.; Hepler, Nathan K.; Cosgrove, Daniel J.

In: BMC Plant Biology, Vol. 13, No. 1, 4, 03.01.2013.

Research output: Contribution to journalArticle

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