SDE2

gene
On this page

Also known as FLJ35382

Summary

SDE2 (spliceosome associated SDE2, HGNC:26643) is a protein-coding gene on chromosome 1q42.12, encoding Splicing regulator SDE2 (Q6IQ49). Inhibits translesion DNA synthesis by preventing monoubiquitination of PCNA, this is necessary to counteract damage due to ultraviolet light-induced replication stress. It is a common-essential gene (DepMap: required in 100.0% of cancer cell lines).

Enables damaged DNA binding activity and snoRNA binding activity. Involved in several processes, including cellular response to UV; gene expression; and mitotic G1 DNA damage checkpoint signaling. Located in several cellular components, including Golgi apparatus; cytosol; and nuclear speck.

Source: NCBI Gene 163859 — RefSeq curated summary.

At a glance

  • Clinical variants (ClinVar): 67 total
  • Cancer dependency (DepMap): dependent in 100.0% of screened cell lines (common-essential)
  • MANE Select transcript: NM_152608

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:26643
Approved symbolSDE2
Namespliceosome associated SDE2
Location1q42.12
Locus typegene with protein product
StatusApproved
AliasesFLJ35382
Ensembl geneENSG00000143751
Ensembl biotypeprotein_coding
OMIM620743
Entrez163859

Gene structure

Transcript identifiers

Ensembl transcripts: 2 — 2 protein_coding

ENST00000272091, ENST00000921002

RefSeq mRNA: 1 — MANE Select: NM_152608 NM_152608

CCDS: CCDS41473

Canonical transcript exons

ENST00000272091 — 7 exons

ExonStartEnd
ENSE00000961804225992891225993002
ENSE00000961805225992398225992567
ENSE00001205040225987896225988388
ENSE00001205057225991243225991363
ENSE00001902148225982702225985523
ENSE00001935405225999193225999343
ENSE00003689286225995266225995383

Expression profiles

Bgee: expression breadth ubiquitous, 258 present calls, max score 97.66.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 22.6362 / max 471.9752, expressed in 1814 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
1773822.63621814

Top tissues by expression

259 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
secondary oocyteCL:000065597.66gold quality
oocyteCL:000002396.18gold quality
tibialis anteriorUBERON:000138595.50gold quality
deltoidUBERON:000147694.24silver quality
lower lobe of lungUBERON:000894993.68gold quality
epithelial cell of pancreasCL:000008393.64silver quality
pericardiumUBERON:000240793.45gold quality
thymusUBERON:000237093.18gold quality
trabecular bone tissueUBERON:000248393.04gold quality
adult organismUBERON:000702393.04gold quality
palpebral conjunctivaUBERON:000181292.94gold quality
upper leg skinUBERON:000426292.62gold quality
skin of hipUBERON:000155492.16gold quality
ileal mucosaUBERON:000033192.15gold quality
spermCL:000001991.87gold quality
seminal vesicleUBERON:000099891.78gold quality
parietal pleuraUBERON:000240091.19gold quality
germinal epithelium of ovaryUBERON:000130491.05gold quality
cauda epididymisUBERON:000436090.76gold quality
bone marrowUBERON:000237190.61gold quality
cardiac muscle of right atriumUBERON:000337990.53silver quality
visceral pleuraUBERON:000240190.28gold quality
caput epididymisUBERON:000435890.26gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450290.25gold quality
vena cavaUBERON:000408790.11gold quality
epithelium of nasopharynxUBERON:000195189.68gold quality
nasopharynxUBERON:000172889.67gold quality
biceps brachiiUBERON:000150789.60gold quality
epithelium of mammary glandUBERON:000324489.51gold quality
cartilage tissueUBERON:000241889.50gold quality

Single-cell (SCXA)

Detected in 4 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes3.85
E-MTAB-6386no360.91
E-GEOD-70580no139.23
E-CURD-112no2.39

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

122 targeting SDE2, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-3163100.0077.238605
HSA-MIR-3613-3P100.0076.367965
HSA-MIR-126-5P100.0072.713180
HSA-MIR-371B-5P99.9975.344759
HSA-MIR-548C-3P99.9974.017587
HSA-MIR-428299.9975.366408
HSA-MIR-186-5P99.9970.833707
HSA-MIR-373-5P99.9875.364753
HSA-MIR-616-5P99.9875.584775
HSA-MIR-1213699.9872.815713
HSA-MIR-3617-3P99.9867.86918
HSA-MIR-485-3P99.9870.681585
HSA-MIR-539-3P99.9870.741616
HSA-MIR-314899.9775.066478
HSA-MIR-365899.9673.874379
HSA-MIR-548AA99.9670.643753
HSA-MIR-548AP-3P99.9670.643753
HSA-MIR-548T-3P99.9670.643753
HSA-MIR-55999.9572.283609
HSA-MIR-548AB99.9571.313488
HSA-MIR-23A-3P99.9574.243163
HSA-MIR-23B-3P99.9574.243163
HSA-MIR-23C99.9573.923192
HSA-MIR-548A-5P99.9471.273482
HSA-MIR-548AD-5P99.9471.233502
HSA-MIR-548AE-5P99.9471.233502
HSA-MIR-548AK99.9471.243488
HSA-MIR-548AM-5P99.9471.243488
HSA-MIR-548AP-5P99.9471.143489
HSA-MIR-548AQ-5P99.9471.343426

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 100.0% of screened cell lines, common-essential.

Literature-anchored findings (GeneRIF, showing 5)

  • collectively, this study uncovers a new role for CRL4CDT2 in protecting genomic integrity against replication stress via regulated proteolysis of PCNA-associated SDE2 and provides insights into how an integrated UBL domain within linear polypeptide sequence controls protein stability and function. (PMID:27906959)
  • Conditional degradation of SDE2 by the Arg/N-End rule pathway regulates stress response at replication forks. (PMID:30698750)
  • SDE2 integrates into the TIMELESS-TIPIN complex to protect stalled replication forks. (PMID:33127907)
  • SDE2 is an essential gene required for ribosome biogenesis and the regulation of alternative splicing. (PMID:34365507)
  • Extended DNA-binding interfaces beyond the canonical SAP domain contribute to the function of replication stress regulator SDE2 at DNA replication forks. (PMID:35850305)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_reriosde2ENSDARG00000024124
mus_musculusSde2ENSMUSG00000038806
rattus_norvegicusSde2ENSRNOG00000003247
drosophila_melanogasterCG5986FBGN0043455
caenorhabditis_elegansWBGENE00009996

Paralogs (1): SF3A3 (ENSG00000183431)

Protein

Protein identifiers

Splicing regulator SDE2Q6IQ49 (reviewed: Q6IQ49)

Alternative names: Replication stress response regulator SDE2

All UniProt accessions (1): Q6IQ49

UniProt curated annotations — full annotation on UniProt →

Function. Inhibits translesion DNA synthesis by preventing monoubiquitination of PCNA, this is necessary to counteract damage due to ultraviolet light-induced replication stress. SDE2 is cleaved following PCNA binding, and its complete degradation is necessary to allow S-phase progression following DNA damage. Plays a role in pre-mRNA splicing by facilitating excision of relatively short introns featuring weak 3’-splice sites (ss) and high GC content. May recruit CACTIN to the spliceosome. Plays a role in ribosome biogenesis by enabling SNORD3- and SNORD118-dependent cleavage of the 47S rRNA precursor. Binds ncRNA (non-coding RNA) including the snoRNAs SNORD3 and SNORD118.

Subunit / interactions. Interacts (via PIP-box) with PCNA; the interaction is direct and prevents ultraviolet light induced monoubiquitination of PCNA. Interacts with FBL/fibrillarin. Interacts with CACTIN. Interacts with SF3B1. Interacts with U2AF1.

Subcellular location. Nucleus. Cytoplasm.

Tissue specificity. Ubiquitously expressed; enriched in brain, lung and liver.

Post-translational modifications. Upon binding to PCNA, the N-terminal UBL (ubiquitin-like) propeptide is cleaved at Gly-77 by an unidentified deubiquitinating enzyme; the resulting mature SDE2 is degraded by the DCX(DTL) complex in a cell cycle- and DNA damage dependent manner. Both SDE2-UBL and the mature SDE2 are polyubiquitinated.

Domain organisation. The PIP-box (PCNA interacting peptide) motif mediates both the interaction with PCNA and cleavage of the SDE2 precursor by a deubiquitinating enzyme. The SAP domain is necessary for specific binding to DNA. The propeptide displays a ubiquitin-like fold.

Similarity. Belongs to the SDE2 family.

Isoforms (3)

UniProt IDNamesCanonical?
Q6IQ49-11yes
Q6IQ49-22
Q6IQ49-33

RefSeq proteins (1): NP_689821* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR025086SDE2/SF3A3_SAPDomain
IPR051421RNA_Proc_DNA_Dmg_RegulatorFamily
IPR053821Sde2_UbiDomain
IPR053822SDE2-like_domDomain

Pfam: PF13297, PF22781, PF22782

UniProt features (29 total): modified residue 5, helix 4, mutagenesis site 3, splice variant 2, sequence conflict 2, turn 2, region of interest 2, compositionally biased region 2, propeptide 1, chain 1, sequence variant 1, domain 1, coiled-coil region 1, short sequence motif 1, site 1

Structure

Experimental structures (PDB)

5 structures.

PDBMethodResolution (Å)
8C6JELECTRON MICROSCOPY2.8
6QDVELECTRON MICROSCOPY3.3
9FMDELECTRON MICROSCOPY3.3
8RO2ELECTRON MICROSCOPY3.5
7N99SOLUTION NMR

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q6IQ49-F165.590.21

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Catalytic / active sites (1): 77–78 (cleavage)

Post-translational modifications (5): 266, 274, 278, 319, 326

Mutagenesis-validated functional residues (3):

PositionPhenotype
47–48no binding to pcna; no cleavage at gly-77.
76–77no cleavage at gly-77.
78no effect on cleavage at gly-77.

Function

Pathways and Gene Ontology

Reactome pathways

4 pathways

IDPathway
R-HSA-72163mRNA Splicing - Major Pathway
R-HSA-72172mRNA Splicing
R-HSA-72203Processing of Capped Intron-Containing Pre-mRNA
R-HSA-8953854Metabolism of RNA

MSigDB gene sets: 212 (showing top): GSE45365_CD8A_DC_VS_CD11B_DC_IFNAR_KO_UP, GSE45365_NK_CELL_VS_CD8A_DC_MCMV_INFECTION_DN, GSE45365_NK_CELL_VS_BCELL_UP, GOBP_RIBOSOME_BIOGENESIS, GOBP_CELLULAR_RESPONSE_TO_UV, GOBP_CELLULAR_RESPONSE_TO_LIGHT_STIMULUS, GOBP_CELL_CYCLE_PHASE_TRANSITION, MAZ_Q6, GOBP_PROTEIN_MATURATION, GOBP_NEGATIVE_REGULATION_OF_CELL_CYCLE_PROCESS, GOBP_NEGATIVE_REGULATION_OF_CELL_CYCLE, REACTOME_PROCESSING_OF_CAPPED_INTRON_CONTAINING_PRE_MRNA, GOBP_REGULATION_OF_CELL_CYCLE, GOBP_REGULATION_OF_CELL_CYCLE_G1_S_PHASE_TRANSITION, GOBP_CELL_CYCLE_G1_S_PHASE_TRANSITION

GO Biological Process (11): endonucleolytic cleavage of tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) (GO:0000479), DNA replication (GO:0006260), protein processing (GO:0016485), protein ubiquitination (GO:0016567), mitotic G1 DNA damage checkpoint signaling (GO:0031571), cellular response to UV (GO:0034644), mRNA cis splicing, via spliceosome (GO:0045292), cell division (GO:0051301), mRNA processing (GO:0006397), RNA splicing (GO:0008380), ribosome biogenesis (GO:0042254)

GO Molecular Function (5): damaged DNA binding (GO:0003684), snoRNA binding (GO:0030515), DNA binding (GO:0003677), RNA binding (GO:0003723), protein binding (GO:0005515)

GO Cellular Component (8): nucleus (GO:0005634), nucleoplasm (GO:0005654), cytoplasm (GO:0005737), mitochondrion (GO:0005739), Golgi apparatus (GO:0005794), cytosol (GO:0005829), plasma membrane (GO:0005886), nuclear speck (GO:0016607)

Reactome top-level categories

Rollup of top-3 pathways:

CategoryPathways
mRNA Splicing1
Processing of Capped Intron-Containing Pre-mRNA1
Metabolism of RNA1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
intracellular membrane-bounded organelle3
cellular anatomical structure3
cytoplasm3
RNA processing2
nucleic acid binding2
rRNA processing1
DNA metabolic process1
DNA biosynthetic process1
proteolysis1
protein maturation1
protein modification by small protein conjugation1
mitotic G1 phase1
mitotic DNA damage checkpoint signaling1
mitotic G1/S transition checkpoint signaling1
response to UV1
cellular response to light stimulus1
mRNA splicing, via spliceosome1
cellular process1
mRNA metabolic process1
ribonucleoprotein complex biogenesis1
DNA binding1
RNA binding1
binding1
nuclear lumen1
intracellular anatomical structure1
endomembrane system1
membrane1
cell periphery1
nuclear ribonucleoprotein granule1

Protein interactions and networks

STRING

804 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
SDE2CDC5LQ99459667
SDE2PRKRIP1Q9H875595
SDE2CACTINQ8WUQ7591
SDE2FAM32AQ9Y421575
SDE2SPRTNQ9H040508
SDE2SLU7O95391487
SDE2YJU2Q9BW85474
SDE2SPEGQ15772471
SDE2GARTP22102469
SDE2CRNKL1Q9BZJ0464
SDE2GNL3LQ9NVN8461
SDE2OR1M1Q8NGA1455
SDE2RTF2Q9BY42452
SDE2CENPUQ71F23451
SDE2UBXN7O94888450

IntAct

12 interactions, top by confidence:

ABTypeScore
MED4MED19psi-mi:“MI:0914”(association)0.900
SDE2HSPBAP1psi-mi:“MI:0915”(physical association)0.500
SLX4SMAPpsi-mi:“MI:0914”(association)0.350
SDE2HOXB6psi-mi:“MI:0914”(association)0.350
Mpsi-mi:“MI:0914”(association)0.350
H2BC10SMCHD1psi-mi:“MI:2364”(proximity)0.270
GPKOWESYT2psi-mi:“MI:2364”(proximity)0.270
HNRNPCSBNO1psi-mi:“MI:2364”(proximity)0.270
SF3B4MED19psi-mi:“MI:2364”(proximity)0.270
SUPV3L1BLTP3Bpsi-mi:“MI:2364”(proximity)0.270
HNRNPA1CNOT1psi-mi:“MI:2364”(proximity)0.270

BioGRID (43): SDE2 (Proximity Label-MS), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-MS), SDE2 (Reconstituted Complex), DTL (Affinity Capture-Western), SDE2 (Affinity Capture-MS), SDE2 (Affinity Capture-RNA), SDE2 (Affinity Capture-MS), HSPBAP1 (Affinity Capture-MS), HOXA5 (Affinity Capture-MS), HOXB6 (Affinity Capture-MS)

ESM2 similar proteins: A0A1L8ENT6, A2BGP7, A2CJ06, B1H1W9, F6RRD7, O00124, O55036, P54274, Q1LV50, Q1LWH4, Q1T7B8, Q28HU3, Q3KNJ2, Q3U1D0, Q3US16, Q4KLN8, Q4V832, Q5I0E6, Q5I2W8, Q5NVA9, Q5RA37, Q5RET9, Q5XI46, Q5ZIN2, Q6AYI4, Q6DRL4, Q6IQ49, Q6IRN0, Q6NV18, Q6P1H6, Q7Z2Z1, Q7Z4M0, Q8BJW7, Q8BKT3, Q8BMG1, Q8BMI4, Q8BQ33, Q8IXW5, Q8K1J5, Q8VC34

Diamond homologs: O14113, Q07G43, Q5BJN8, Q5RET9, Q6IQ49, Q6NRI5, Q7T293, Q8K1J5, O46106, O59706, Q12874, Q9D554, Q9FG01, P19736

SIGNOR signaling

2 interactions.

AEffectBMechanism
DTL“down-regulates quantity by destabilization”SDE2binding
Cullin4-RBX1-DDB1“down-regulates quantity by destabilization”SDE2polyubiquitination

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 18 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
Dengue Virus-Host Interactions519.0×4e-04

Disease & clinical

Clinical variants and AI predictions

ClinVar

67 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance58
Likely benign4
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

1067 predictions. Top by Δscore:

VariantEffectΔscore
1:225985304:A:ACdonor_gain1.0000
1:225985313:T:TAdonor_gain1.0000
1:225985314:C:Adonor_gain1.0000
1:225987890:A:ACdonor_gain1.0000
1:225987891:C:CCdonor_gain1.0000
1:225987891:CTTA:Cdonor_gain1.0000
1:225987892:TTA:Tdonor_loss1.0000
1:225987894:A:ACdonor_gain1.0000
1:225987894:ACTG:Adonor_gain1.0000
1:225987895:C:CTdonor_gain1.0000
1:225987895:CT:Cdonor_gain1.0000
1:225987895:CTG:Cdonor_gain1.0000
1:225987895:CTGC:Cdonor_gain1.0000
1:225987895:CTGCG:Cdonor_gain1.0000
1:225987915:T:Adonor_gain1.0000
1:225991238:CTTA:Cdonor_loss1.0000
1:225991239:TTAC:Tdonor_loss1.0000
1:225991240:TACCA:Tdonor_loss1.0000
1:225991241:A:ACdonor_gain1.0000
1:225991241:AC:Adonor_gain1.0000
1:225991241:ACCA:Adonor_loss1.0000
1:225991242:C:CTdonor_gain1.0000
1:225991242:CC:Cdonor_gain1.0000
1:225991242:CCA:Cdonor_gain1.0000
1:225991242:CCAG:Cdonor_gain1.0000
1:225991242:CCAGA:Cdonor_gain1.0000
1:225991359:CATAC:Cacceptor_gain1.0000
1:225991361:TAC:Tacceptor_gain1.0000
1:225991362:AC:Aacceptor_gain1.0000
1:225991363:CC:Cacceptor_gain1.0000

AlphaMissense

2956 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
1:225992915:A:GL109P0.999
1:225992917:T:AR108S0.999
1:225992917:T:GR108S0.999
1:225992918:C:GR108T0.999
1:225992920:C:AR107S0.999
1:225992920:C:GR107S0.999
1:225992921:C:GR107T0.999
1:225992924:C:TG106E0.999
1:225992930:A:GL104P0.999
1:225992933:T:GD103A0.999
1:225992936:C:GR102P0.999
1:225992987:A:TL85H0.999
1:225992998:A:CF81L0.999
1:225992998:A:TF81L0.999
1:225993000:A:GF81L0.999
1:225992912:C:GR110P0.998
1:225992919:T:CR108G0.998
1:225992921:C:AR107M0.998
1:225992930:A:TL104H0.998
1:225992932:A:CD103E0.998
1:225992932:A:TD103E0.998
1:225992933:T:AD103V0.998
1:225992933:T:CD103G0.998
1:225992934:C:GD103H0.998
1:225992987:A:GL85P0.998
1:225992996:C:TG82E0.998
1:225992555:C:AW121C0.997
1:225992555:C:GW121C0.997
1:225992913:G:TR110S0.997
1:225992924:C:AG106V0.997

dbSNP variants (sampled 300 via entrez): RS1000195235 (1:225994095 T>G), RS1000204923 (1:225993788 G>A,C,T), RS1000458350 (1:225999654 A>G), RS1000514442 (1:225988983 G>A,C), RS1000519694 (1:225995502 T>G), RS1000815645 (1:225990332 T>C), RS1000846951 (1:225990023 C>T), RS1000976718 (1:225983471 T>C), RS1000982584 (1:225995203 T>C), RS1001037236 (1:225984585 T>G), RS1001087761 (1:225990105 C>A), RS1001101170 (1:225982974 A>G), RS1001140285 (1:225996589 C>T), RS1001183427 (1:225985597 C>T), RS1001422384 (1:225984236 A>G)

Disease associations

OMIM: gene MIM:620743 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

0 associations (top):

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

46 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Cyclosporineincreases expression3
sodium arseniteincreases abundance, increases expression2
Arsenicaffects expression, increases abundance, increases expression2
Tobacco Smoke Pollutionincreases expression2
aristolochic acid Iincreases expression1
3-((6-(2-methoxyphenyl)pyrimidin-4-yl)amino)phenyl)methane sulfonamidedecreases expression1
FR900359increases phosphorylation1
ginger extractdecreases expression, decreases reaction, increases abundance1
triphenyl phosphateaffects expression1
bisphenol Adecreases expression, decreases reaction, increases abundance1
tris(1,3-dichloro-2-propyl)phosphateincreases expression1
cobaltous chlorideincreases expression1
butyraldehydeincreases expression1
zinc chromateincreases abundance, increases expression1
gossypol acetic aciddecreases expression1
di-n-butylphosphoric acidaffects expression1
chromium hexavalent ionincreases abundance, increases expression1
pentabromodiphenyl etherincreases expression1
dimethylarsinous acidincreases expression1
abrineincreases expression1
elesclomolincreases expression1
(4-amino-1,4-dihydro-3-(2-pyridyl)-5-thioxo-1,2,4-triazole)copper(II)increases expression1
bisphenol Sincreases methylation1
jinfukangaffects cotreatment, decreases expression1
Sunitinibincreases expression1
Leflunomideincreases expression1
Acetaminophenincreases expression1
Air Pollutantsincreases abundance, increases expression1
Air Pollutants, Occupationalincreases expression1
Benzo(a)pyreneincreases expression1

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.