SSA1 - Plant Editosome Database - CNCB-NGDC

Summary

Editing Factor: SSA1
Synonym: Seedling Stage Albino1
Description: In the ssa1 mutants, plastid genes transcribed by plastid-encoded RNA polymerase decreased, while those transcribed by nuclear-encoded RNA polymerase increased at the mRNA level; Loss-of-function SSA1 destroys RNA editing of ndhB-737 and intron splicing of atpF and ycf3-2 in the plastid genome
Protein Family: PPR
Subclass: P
Physical Interaction: OsMORF8; OsTRXz
Construct Structure: P
Gene ID & Species: LOC_Os02g47360 (Oryza sativa)
Edited Gene(s): ndhB
Editing Type(s): C-to-U (7)
Publication(s): [1] A chloroplast-localized pentatricopeptide repeat protein involved in RNA editing and splicing and its effects on chloroplast development in rice., BMC plant biology, 2022. [PMID=36096762]

Editing Details

Species Gene ID Organelle Edited Gene Position Region Nuclear Genome Organelle Genome Other Position Region Other Position Editing Type Codon Amino Acid Molecular Effect Experiment Details
Oryza sativa LOC_Os02g47360 Chloroplast ndhB 737 CDS NA NA NA NA C-to-U CCA=>CUA P=>L Recoding
Experiment Details
Genotype (Ecotype) Allele Treatment Treatment Detail Mutant Type Phenotype Tissue Development Stage Detection Method Editing Frequency Editing Extent Mutant Effect PMID
NipponbareWTControlControlNo mutantNormalSeedlingNASequencing chromatograms were derived by direct sequencing o96.15%HighNone36096762
NAssa1DeletionThe ssa1 locus was fine mapped to a interval between markers InD2891 and InD2922 on chromosome 2 (Chr. 2). There is a 14 bp deletion on the first exon of the SSA1.HeterozygousAlbino and seedling-lethal phenotypes. he mutation of SSA1 resulted in a slightly shorter plant height and reduced chlorophyll content. The albino phenotype appeared in the whole seedling after seed germination in ssa1, but the growth was completely normal before the four-leaf stage. Then, the ssa1 plant withered and died at the seedling stage after the four-leaf stage. Transmission electron microscopy (TEM) was used to observe the cytological structure of leaves. The chloroplast structure was almost unaffected in WT, while the chloroplasts collapsed and shrank in ssa1SeedlingNASequencing chromatograms were derived by direct sequencing o54.84%MediumDecreased36096762
NACom1ComplementationFor complementation tests of the ssa1 mutant, the CDS of SSA1 was cloned into the pCAMBIA2300 binary vector and expressed by the driving actin promoter.HeterozygousAll positive complementary line plants developed normal green leaves at seedling stages and were restored to WT chlorophyll levels. The structure of chloroplasts was also detected by TEM.SeedlingNASequencing chromatograms were derived by direct sequencing o91.84%HighRestored36096762
NACom2ComplementationFor complementation tests of the ssa1 mutant, the CDS of SSA1 was cloned into the pCAMBIA2300 binary vector and expressed by the driving actin promoter.HeterozygousAll positive complementary line plants developed normal green leaves at seedling stages and were restored to WT chlorophyll levels. The structure of chloroplasts was also detected by TEM.SeedlingNASequencing chromatograms were derived by direct sequencing o100.00%CompleteRestored36096762
NACom3ComplementationFor complementation tests of the ssa1 mutant, the CDS of SSA1 was cloned into the pCAMBIA2300 binary vector and expressed by the driving actin promoter.HeterozygousAll positive complementary line plants developed normal green leaves at seedling stages and were restored to WT chlorophyll levels. The structure of chloroplasts was also detected by TEM.SeedlingNASequencing chromatograms were derived by direct sequencing o100.00%CompleteRestored36096762
Nipponbaressa1-2KnockoutTo further confirm the result that the phenotype of ssa1 was caused by the functional loss of LOC_Os02g47360, the CRISPR–Cas9 system was used to construct a knockout mutant of this gene. Among the mulKnockoutAlbinism at the seedling stage with reduced chlorophyll content.SeedlingNASequencing chromatograms were derived by direct sequencing o56.04%MediumDecreased36096762
Nipponbaressa1-9KnockoutTo further confirm the result that the phenotype of ssa1 was caused by the functional loss of LOC_Os02g47360, the CRISPR–Cas9 system was used to construct a knockout mutant of this gene. Among the mulKnockoutAlbinism at the seedling stage with reduced chlorophyll content.SeedlingNASequencing chromatograms were derived by direct sequencing o50.00%MediumDecreased36096762
Last update: Feb 2026 (version 2.0)