LSM3

gene
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Also known as YLR438CSMX4USS2

Summary

LSM3 (LSM3 homolog, U6 small nuclear RNA and mRNA degradation associated, HGNC:17874) is a protein-coding gene on chromosome 3p25.1, encoding U6 snRNA-associated Sm-like protein LSm3 (P62310). Plays a role in pre-mRNA splicing as component of the U4/U6-U5 tri-snRNP complex that is involved in spliceosome assembly, and as component of the precatalytic spliceosome (spliceosome B complex). It is a common-essential gene (DepMap: required in 99.3% of cancer cell lines).

Sm-like proteins were identified in a variety of organisms based on sequence homology with the Sm protein family (see SNRPD2; MIM 601061). Sm-like proteins contain the Sm sequence motif, which consists of 2 regions separated by a linker of variable length that folds as a loop. The Sm-like proteins are thought to form a stable heteromer present in tri-snRNP particles, which are important for pre-mRNA splicing.

Source: NCBI Gene 27258 — RefSeq curated summary.

At a glance

  • GWAS associations: 13
  • Clinical variants (ClinVar): 21 total — 4 pathogenic
  • Cancer dependency (DepMap): dependent in 99.3% of screened cell lines (common-essential)
  • MANE Select transcript: NM_014463

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:17874
Approved symbolLSM3
NameLSM3 homolog, U6 small nuclear RNA and mRNA degradation associated
Location3p25.1
Locus typegene with protein product
StatusApproved
AliasesYLR438C, SMX4, USS2
Ensembl geneENSG00000170860
Ensembl biotypeprotein_coding
OMIM607283
Entrez27258

Gene structure

Transcript identifiers

Ensembl transcripts: 3 — 3 protein_coding

ENST00000306024, ENST00000907170, ENST00000907171

RefSeq mRNA: 1 — MANE Select: NM_014463 NM_014463

CCDS: CCDS2619

Canonical transcript exons

ENST00000306024 — 4 exons

ExonStartEnd
ENSE000011327211419803614201122
ENSE000011327281418156014181670
ENSE000011601951418393714184032
ENSE000011602021417881714178881

Expression profiles

Bgee: expression breadth ubiquitous, 294 present calls, max score 97.65.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 30.8277 / max 731.2733, expressed in 1804 samples.

FANTOM5 promoters (3 alternative TSS)

Promoter IDTPM avgSamples expressed
3544527.29161803
354442.71261347
354430.8234434

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
biceps brachiiUBERON:000150797.65gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450297.49gold quality
diaphragmUBERON:000110397.47gold quality
heart right ventricleUBERON:000208097.43gold quality
type B pancreatic cellCL:000016997.01gold quality
oral cavityUBERON:000016796.94gold quality
triceps brachiiUBERON:000150996.57gold quality
mucosa of sigmoid colonUBERON:000499396.48gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451196.42gold quality
adult organismUBERON:000702396.32gold quality
trabecular bone tissueUBERON:000248396.25gold quality
gluteal muscleUBERON:000200096.04gold quality
body of tongueUBERON:001187696.03gold quality
corpus epididymisUBERON:000435995.91gold quality
colonic mucosaUBERON:000031795.76gold quality
pharyngeal mucosaUBERON:000035595.69gold quality
seminal vesicleUBERON:000099895.31gold quality
tongueUBERON:000172395.28gold quality
synovial jointUBERON:000221795.27gold quality
penisUBERON:000098995.19gold quality
olfactory bulbUBERON:000226495.18gold quality
male germ cellCL:000001595.17gold quality
vena cavaUBERON:000408795.07gold quality
pigmented layer of retinaUBERON:000178295.04gold quality
renal medullaUBERON:000036294.98gold quality
spermCL:000001994.96gold quality
tendon of biceps brachiiUBERON:000818894.90gold quality
mammalian vulvaUBERON:000099794.88gold quality
jejunumUBERON:000211594.88gold quality
superior surface of tongueUBERON:000737194.86gold quality

Single-cell (SCXA)

Detected in 6 experiment(s), a significant marker in 3.

ExperimentMarker?Max mean expression
E-HCAD-1yes41.79
E-ANND-3yes12.93
E-GEOD-93593yes8.92
E-MTAB-10485no760.43
E-MTAB-9388no727.55
E-MTAB-6386no206.22

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

21 targeting LSM3, 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-3646100.0073.565283
HSA-MIR-6833-3P100.0070.633197
HSA-MIR-4768-5P100.0069.492861
HSA-MIR-6758-5P100.0066.211470
HSA-MIR-453199.9969.703181
HSA-MIR-366299.9973.825684
HSA-MIR-6809-3P99.9171.453814
HSA-MIR-469899.8471.414303
HSA-MIR-58799.6470.862611
HSA-MIR-889-3P99.4069.762103
HSA-MIR-5000-3P98.7965.631251
HSA-MIR-876-3P98.7668.23945
HSA-MIR-323A-5P98.5965.13651
HSA-MIR-4720-3P98.5068.88988
HSA-MIR-6838-3P98.4065.88559
HSA-MIR-4436A98.0564.831140
HSA-MIR-127997.8367.501898
HSA-MIR-4700-3P97.7468.641014
HSA-MIR-5579-3P97.0068.811111
HSA-MIR-675-3P95.7769.27675
HSA-MIR-6763-3P90.8064.3280

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 99.3% of screened cell lines, common-essential.

Literature-anchored findings (GeneRIF, showing 1)

  • LSm1-7 proteins colocalize with DCP1,DCP2 and Xrn1 in cytoplasmic foci (PMID:12515382)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_reriolsm3ENSDARG00000089663
mus_musculusLsm3ENSMUSG00000034192
rattus_norvegicusLsm3ENSRNOG00000008733
drosophila_melanogasterLSm3FBGN0051184
caenorhabditis_elegansWBGENE00003077

Protein

Protein identifiers

U6 snRNA-associated Sm-like protein LSm3P62310 (reviewed: P62310)

All UniProt accessions (1): P62310

UniProt curated annotations — full annotation on UniProt →

Function. Plays a role in pre-mRNA splicing as component of the U4/U6-U5 tri-snRNP complex that is involved in spliceosome assembly, and as component of the precatalytic spliceosome (spliceosome B complex). The heptameric LSM2-8 complex binds specifically to the 3’-terminal U-tract of U6 snRNA.

Subunit / interactions. Component of the precatalytic spliceosome (spliceosome B complex). Component of the U4/U6-U5 tri-snRNP complex, a building block of the precatalytic spliceosome (spliceosome B complex). The U4/U6-U5 tri-snRNP complex is composed of the U4, U6 and U5 snRNAs and at least PRPF3, PRPF4, PRPF6, PRPF8, PRPF31, SNRNP200, TXNL4A, SNRNP40, SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF, SNRPG, DDX23, CD2BP2, PPIH, SNU13, EFTUD2, SART1 and USP39, plus LSM2, LSM3, LSM4, LSM5, LSM6, LSM7 and LSM8. LSM2, LSM3, LSM4, LSM5, LSM6, LSM7 and LSM8 form a heptameric, ring-shaped subcomplex (the LSM2-8 complex) that is part of the U4/U6-U5 tri-snRNP complex and the precatalytic spliceosome.

Subcellular location. Nucleus.

Similarity. Belongs to the snRNP Sm proteins family.

RefSeq proteins (1): NP_055278* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR001163Sm_dom_euk/arcDomain
IPR010920LSM_dom_sfHomologous_superfamily
IPR034105Lsm3Domain
IPR040002Sm-like_LSM3Family
IPR047575SmDomain

Pfam: PF01423

UniProt features (4 total): initiator methionine 1, chain 1, domain 1, modified residue 1

Structure

Experimental structures (PDB)

20 structures.

PDBMethodResolution (Å)
8H6LELECTRON MICROSCOPY2.6
8H6KELECTRON MICROSCOPY2.7
6QW6ELECTRON MICROSCOPY2.92
8H6EELECTRON MICROSCOPY3.2
8H6JELECTRON MICROSCOPY3.25
6QX9ELECTRON MICROSCOPY3.28
6AHDELECTRON MICROSCOPY3.8
8QZSELECTRON MICROSCOPY4.1
8R09ELECTRON MICROSCOPY4.3
8R0BELECTRON MICROSCOPY4.4
5O9ZELECTRON MICROSCOPY4.5
8QO9ELECTRON MICROSCOPY5.29
6AH0ELECTRON MICROSCOPY5.7
8R0AELECTRON MICROSCOPY5.8
8R08ELECTRON MICROSCOPY6.1
8RM5ELECTRON MICROSCOPY6.9
3JCRELECTRON MICROSCOPY7
7ABGELECTRON MICROSCOPY7.8
9R8VELECTRON MICROSCOPY8.5
8QXDELECTRON MICROSCOPY9.6

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-P62310-F189.490.71

Functional residue map

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

Post-translational modifications (1): 2

Function

Pathways and Gene Ontology

Reactome pathways

6 pathways

IDPathway
R-HSA-430039mRNA decay by 5’ to 3’ exoribonuclease
R-HSA-72163mRNA Splicing - Major Pathway
R-HSA-429914Deadenylation-dependent mRNA decay
R-HSA-72172mRNA Splicing
R-HSA-72203Processing of Capped Intron-Containing Pre-mRNA
R-HSA-8953854Metabolism of RNA

MSigDB gene sets: 203 (showing top): GOBP_P_BODY_ASSEMBLY, GOBP_REGULATION_OF_MRNA_CATABOLIC_PROCESS, BASSO_B_LYMPHOCYTE_NETWORK, PAL_PRMT5_TARGETS_UP, MODULE_151, REACTOME_MRNA_DECAY_BY_5_TO_3_EXORIBONUCLEASE, GOBP_MACROMOLECULE_CATABOLIC_PROCESS, MORF_RAD21, MODULE_16, PUJANA_CHEK2_PCC_NETWORK, GOBP_POST_TRANSCRIPTIONAL_REGULATION_OF_GENE_EXPRESSION, MORF_SKP1A, MUELLER_PLURINET, GOBP_SPLICEOSOMAL_TRI_SNRNP_COMPLEX_ASSEMBLY, GOBP_REGULATION_OF_CATABOLIC_PROCESS

GO Biological Process (4): mRNA splicing, via spliceosome (GO:0000398), mRNA processing (GO:0006397), P-body assembly (GO:0033962), RNA splicing (GO:0008380)

GO Molecular Function (3): RNA binding (GO:0003723), U6 snRNA 3’-end binding (GO:0030629), protein binding (GO:0005515)

GO Cellular Component (13): P-body (GO:0000932), nucleus (GO:0005634), nucleoplasm (GO:0005654), spliceosomal complex (GO:0005681), U6 snRNP (GO:0005688), cytosol (GO:0005829), U4/U6 x U5 tri-snRNP complex (GO:0046540), U2-type precatalytic spliceosome (GO:0071005), precatalytic spliceosome (GO:0071011), catalytic step 2 spliceosome (GO:0071013), Lsm2-8 complex (GO:0120115), Lsm1-7-Pat1 complex (GO:1990726), ribonucleoprotein complex (GO:1990904)

Reactome top-level categories

Rollup of top-4 pathways:

CategoryPathways
Metabolism of RNA2
Deadenylation-dependent mRNA decay1
mRNA Splicing1
Processing of Capped Intron-Containing Pre-mRNA1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
RNA processing2
cellular anatomical structure2
U5 snRNP2
spliceosomal complex2
Sm-like protein family complex2
RNA splicing, via transesterification reactions with bulged adenosine as nucleophile1
mRNA processing1
mRNA metabolic process1
membraneless organelle assembly1
nucleic acid binding1
U6 snRNA binding1
binding1
cytoplasmic ribonucleoprotein granule1
intracellular membrane-bounded organelle1
nuclear lumen1
nuclear protein-containing complex1
ribonucleoprotein complex1
spliceosomal snRNP complex1
Lsm2-8 complex1
cytoplasm1
U4/U6 snRNP1
spliceosomal tri-snRNP complex1
U2-type spliceosomal complex1
U1 snRNP1
U2 snRNP1
U4/U6 x U5 tri-snRNP complex1
precatalytic spliceosome1
Prp19 complex1
catalytic complex1
protein-containing complex1

Protein interactions and networks

STRING

2162 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
LSM3LSM2Q9Y333999
LSM3LSM4Q9Y4Z0998
LSM3LSM6P62312997
LSM3LSM7Q9UK45996
LSM3LSM8O95777993
LSM3LSM5Q9Y4Y9991
LSM3LSM1O15116986
LSM3XRN1Q8IZH2921
LSM3SNRPFP62306715
LSM3SNRPD1P13641665
LSM3SNRPEP08578665
LSM3SNRPD3P43331625
LSM3EDC3Q96F86619
LSM3LSM12Q3MHD2616
LSM3DCP2Q8IU60561

IntAct

246 interactions, top by confidence:

ABTypeScore
LSM2LSM3psi-mi:“MI:0915”(physical association)0.980
LSM3LSM2psi-mi:“MI:0915”(physical association)0.980
LSM3LSM2psi-mi:“MI:2364”(proximity)0.980

BioGRID (217): LSM3 (Two-hybrid), LSM3 (Two-hybrid), LSM3 (Two-hybrid), LSM3 (Two-hybrid), LSM3 (Two-hybrid), LSM2 (Two-hybrid), LSM3 (Two-hybrid), LSM2 (Two-hybrid), LSM10 (Two-hybrid), LSM3 (Two-hybrid), LSM1 (Co-fractionation), LSM3 (Co-fractionation), LSM3 (Co-fractionation), LSM3 (Co-fractionation), LSM3 (Co-fractionation)

ESM2 similar proteins: A5GFZ5, A8MWD9, C9WPN6, O35900, O60762, O70152, P02362, P50894, P62084, P62306, P62307, P62308, P62309, P62310, P62311, P62314, P62315, P62318, P62320, P62321, P62323, P62487, P62488, P62489, P82931, Q16576, Q1JQ93, Q24572, Q2TBV5, Q2VIR3, Q32PE9, Q3SWX8, Q3T0Z8, Q3ZBL0, Q3ZC10, Q4R304, Q4R5F6, Q5E9B8, Q5ZMS3, Q60973

Diamond homologs: A5DRQ6, A8NHT8, B0DWN3, B6YUU5, C5A1H1, C6A1T2, O22823, O26745, O29386, O42978, O59734, O74016, O74966, P34659, P40089, P57670, P62306, P62307, P62310, P62311, P62312, P62313, P62321, Q0W8R9, Q12U30, Q1DRN0, Q1ZXK3, Q24297, Q32PE9, Q3T0Z8, Q465S1, Q4PG71, Q552U1, Q5JIE0, Q6BR90, Q8PZZ9, Q8TL47, Q8U0P4, Q97BU5, Q9C6K5

SIGNOR signaling

1 interactions.

AEffectBMechanism
LSM3“form complex”“U4/U6.U5 snRNP complex”binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 58 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
mRNA decay by 5’ to 3’ exoribonuclease595.2×7e-08
snRNP Assembly526.4×4e-05
mRNA Splicing924.7×1e-08
Processing of Capped Intron-Containing Pre-mRNA918.5×6e-08
mRNA Splicing - Major Pathway1115.0×1e-08
Metabolism of RNA1414.6×7e-11
Viral Infection Pathways75.4×7e-03

GO biological processes:

GO termPartnersFoldFDR
spliceosomal snRNP assembly668.4×5e-08
mRNA splicing, via spliceosome1323.4×3e-12
RNA splicing813.8×1e-05

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic4
Likely pathogenic0
Uncertain significance11
Likely benign0
Benign2

Top pathogenic / likely-pathogenic (4)

Variant IDHGVSClassification
1071711NC_000003.11:g.(?14166684)(14220439_?)delPathogenic
1458454NC_000003.11:g.(?14206303)(14220439_?)delPathogenic
2425188NC_000003.11:g.(?14214357)(14220439_?)delPathogenic
831828NC_000003.12:g.(?14170428)(14178939_?)delPathogenic

SpliceAI

355 predictions. Top by Δscore:

VariantEffectΔscore
3:14181555:A:AGacceptor_gain1.0000
3:14181557:CAGC:Cacceptor_loss1.0000
3:14181558:A:AGacceptor_gain1.0000
3:14181559:G:Aacceptor_loss1.0000
3:14181559:G:GAacceptor_gain1.0000
3:14181559:GC:Gacceptor_gain1.0000
3:14181559:GCA:Gacceptor_gain1.0000
3:14181559:GCAA:Gacceptor_gain1.0000
3:14181559:GCAAC:Gacceptor_gain1.0000
3:14181666:TACAT:Tdonor_gain1.0000
3:14181667:ACAT:Adonor_gain1.0000
3:14181668:CAT:Cdonor_gain1.0000
3:14181669:AT:Adonor_gain1.0000
3:14181669:ATG:Adonor_loss1.0000
3:14181670:TG:Tdonor_loss1.0000
3:14181671:G:GAdonor_loss1.0000
3:14181671:G:GGdonor_gain1.0000
3:14181672:TAAG:Tdonor_loss1.0000
3:14181675:G:GGdonor_gain1.0000
3:14183930:A:AGacceptor_gain1.0000
3:14183931:C:Gacceptor_gain1.0000
3:14183931:CTTTA:Cacceptor_loss1.0000
3:14183932:TTTA:Tacceptor_loss1.0000
3:14183933:TTAGG:Tacceptor_loss1.0000
3:14183934:TAGG:Tacceptor_loss1.0000
3:14183935:A:AGacceptor_gain1.0000
3:14183935:AG:Aacceptor_gain1.0000
3:14183935:AGG:Aacceptor_loss1.0000
3:14183936:G:Aacceptor_loss1.0000
3:14183936:G:GAacceptor_gain1.0000

AlphaMissense

659 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
3:14181588:C:AP17H1.000
3:14181591:T:CL18P1.000
3:14181594:A:TD19V1.000
3:14181597:T:CL20P1.000
3:14181606:T:CL23P1.000
3:14181630:T:AV31E1.000
3:14181639:G:CR34T1.000
3:14181640:A:CR34S1.000
3:14181640:A:TR34S1.000
3:14181648:G:CR37P1.000
3:14181654:T:AL39H1.000
3:14181654:T:CL39P1.000
3:14181659:G:AG41S1.000
3:14181659:G:CG41R1.000
3:14181659:G:TG41C1.000
3:14181660:G:AG41D1.000
3:14181660:G:TG41V1.000
3:14181666:T:CL43S1.000
3:14183937:G:CA45P1.000
3:14183938:C:AA45D1.000
3:14183943:G:AD47N1.000
3:14183943:G:CD47H1.000
3:14183943:G:TD47Y1.000
3:14183944:A:CD47A1.000
3:14183944:A:GD47G1.000
3:14183944:A:TD47V1.000
3:14183945:T:AD47E1.000
3:14183945:T:GD47E1.000
3:14183949:C:GH49D1.000
3:14183950:A:GH49R1.000

dbSNP variants (sampled 300 via entrez): RS1000060401 (3:14197287 T>C,G), RS1000122809 (3:14192176 T>C), RS1000153986 (3:14192036 T>G), RS1000390228 (3:14197545 A>G), RS1000409652 (3:14179791 A>G), RS1000680819 (3:14198783 G>A,T), RS1000719173 (3:14197836 T>C), RS1000720435 (3:14192159 T>C), RS1000890686 (3:14181210 A>G), RS1001077457 (3:14187757 C>T), RS1001400761 (3:14188047 G>A,T), RS1001418324 (3:14181175 G>A,C), RS1001737149 (3:14200413 G>A), RS1001989049 (3:14196318 C>A), RS1002075069 (3:14185142 G>A)

Disease associations

OMIM: gene MIM:607283 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

13 associations (top):

StudyTraitp-value
GCST007576_265Chronotype3.000000e-10
GCST008363_31Offspring birth weight2.000000e-10
GCST008839_424Height2.000000e-09
GCST010320_106PR interval2.000000e-17
GCST010321_199PR interval2.000000e-19
GCST010796_1637Electrocardiogram morphology (amplitude at temporal datapoints)2.000000e-15
GCST010796_1638Electrocardiogram morphology (amplitude at temporal datapoints)7.000000e-10
GCST010796_1639Electrocardiogram morphology (amplitude at temporal datapoints)6.000000e-12
GCST010796_1640Electrocardiogram morphology (amplitude at temporal datapoints)1.000000e-13
GCST010796_1641Electrocardiogram morphology (amplitude at temporal datapoints)3.000000e-15
GCST011202_5Dilated cardiomyopathy (MTAG)9.000000e-09
GCST012211_1Dilated cardiomyopathy5.000000e-13
GCST90002403_130Red blood cell count4.000000e-09

EFO canonical traits (6, from GWAS)

EFO IDTrait name
EFO:0008328chronotype measurement
EFO:0004344birth weight
EFO:0005939parental genotype effect measurement
EFO:0004462PR interval
EFO:0004327electrocardiography
EFO:0004305erythrocyte count

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

PharmGKB variants

1 variants.

VariantGenesLevelScore#Clin annotsDrugs
rs1870134LSM3, XPC0.000

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
sodium arseniteincreases abundance, increases expression3
bisphenol Aaffects expression, decreases expression2
(+)-JQ1 compounddecreases expression2
Air Pollutantsdecreases expression, increases abundance2
methylmercuric chloridedecreases expression1
triphenyl phosphateaffects expression1
deoxynivalenolincreases expression1
arseniteaffects binding, increases reaction1
tris(1,3-dichloro-2-propyl)phosphatedecreases expression1
cobaltous chloridedecreases expression1
M-VAC protocolincreases response to substance1
yessotoxindecreases expression1
CGP 52608affects binding, increases reaction1
CD 437decreases expression1
K 7174decreases expression1
3-(4’-hydroxy-3’-adamantylbiphenyl-4-yl)acrylic aciddecreases expression1
ICG 001decreases expression1
PP242increases expression1
Arsenicincreases abundance, increases expression1
Benzo(a)pyreneincreases methylation1
Coaldecreases expression, increases abundance1
Ivermectindecreases expression1
Phenobarbitalaffects expression1
Ribonucleotidesaffects binding1
Smokedecreases expression, increases abundance1
Cyclosporineaffects expression1
Copper Sulfatedecreases expression1
Lactic Aciddecreases expression1
Acrylamideincreases expression1
Particulate Matterincreases abundance, decreases 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.