GEPHE SUMMARY Print
Entry Status
Published
GepheID
GP00000868
Main curator
Martin
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
Flaveria pringlei
Trait State in Taxon B
Flaveria trinervia
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
-
Synonyms
Flaveria pringlei Gand.
Rank
species
Lineage
Show more ... hyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; campanulids; Asterales; Asteraceae; Asteroideae; Heliantheae alliance; Tageteae; Flaveria
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
-
Synonyms
Flaveria australasica; Flaveria australasica Hook.; Flaveria trinervia (Spreng.) C.Mohr
Rank
species
Lineage
Show more ... hyllophyta; Spermatophyta; Magnoliophyta; Mesangiospermae; eudicotyledons; Gunneridae; Pentapetalae; asterids; campanulids; Asterales; Asteraceae; Asteroideae; Heliantheae alliance; Tageteae; Flaveria
NCBI Taxonomy ID
is Taxon B an Infraspecies?
No
GENOTYPIC CHANGE
Generic Gene Name
PPCA
Synonyms
-
String
-
Sequence Similarities
Belongs to the PEPCase type 1 family.
UniProtKB
Flaveria trinervia
GenebankID or UniProtKB
Presumptive Null
No
Molecular Type
Aberration Type
Insertion Size
1-9 bp
Molecular Details of the Mutation
insertion of tetranucleotide CACT
Experimental Evidence
Authors
Akyildiz M; Gowik U; Engelmann S; Koczor M; Streubel M; Westhoff P
Abstract
C(4) photosynthesis presents a sophisticated integration of two complementary cell types, mesophyll and bundle sheath cells. It relies on the differential expression of the genes encoding the component enzymes and transporters of this pathway. The entry enzyme of C(4) photosynthesis, phosphoenolpyruvate carboxylase (PEPC), is found exclusively in mesophyll cells, and the expression of the corresponding gene is regulated at the transcriptional level. In the C(4) dicot Flaveria trinervia, the mesophyll-specific expression of the C(4) PEPC gene (ppcA) depends on a 41-bp segment in the distal promoter region referred to as MEM1 (for mesophyll expression module1). Here, we show that a MEM1 sequence found in the orthologous ppcA gene from the C(3) species Flaveria pringlei is not able to direct mesophyll-specific gene expression. The two orthologous MEM1 sequences of F. pringlei and F. trinervia differ at two positions, a G-to-A exchange and the insertion of the tetranucleotide CACT. Changes at these two positions in the C(3) MEM1 sequence were necessary and sufficient to create a mesophyll-specificity element during C(4) evolution. The MEM1 of F. trinervia enhances mesophyll expression and concomitantly represses expression in bundle sheath cells and vascular bundles.
Additional References
RELATED GEPHE
Related Genes
No matches found.
Related Haplotypes
2
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