MYL1

gene
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Also known as MLC1MLC1FMLC3FMLC-1MLC1/3

Summary

MYL1 (myosin light chain 1, HGNC:7582) is a protein-coding gene on chromosome 2q34, encoding Myosin light chain 1/3, skeletal muscle isoform (P05976). Non-regulatory myosin light chain required for proper formation and/or maintenance of myofibers, and thus appropriate muscle function.

Myosin is a hexameric ATPase cellular motor protein. It is composed of two heavy chains, two nonphosphorylatable alkali light chains, and two phosphorylatable regulatory light chains. This gene encodes a myosin alkali light chain expressed in fast skeletal muscle. Two transcript variants have been identified for this gene.

Source: NCBI Gene 4632 — RefSeq curated summary.

At a glance

  • Gene–disease (curated): congenital myopathy with reduced type 2 muscle fibers (Moderate, GenCC) — +1 more curated relationship
  • GWAS associations: 1
  • Clinical variants (ClinVar): 54 total — 1 likely-pathogenic
  • Phenotypes (HPO): 30
  • MANE Select transcript: NM_079420

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:7582
Approved symbolMYL1
Namemyosin light chain 1
Location2q34
Locus typegene with protein product
StatusApproved
AliasesMLC1, MLC1F, MLC3F, MLC-1, MLC1/3
Ensembl geneENSG00000168530
Ensembl biotypeprotein_coding
OMIM160780
Entrez4632

Gene structure

Transcript identifiers

Ensembl transcripts: 5 — 3 protein_coding, 2 protein_coding_CDS_not_defined

ENST00000341685, ENST00000352451, ENST00000484290, ENST00000496436, ENST00000957378

RefSeq mRNA: 2 — MANE Select: NM_079420 NM_079420, NM_079422

CCDS: CCDS2390, CCDS2391

Canonical transcript exons

ENST00000352451 — 7 exons

ExonStartEnd
ENSE00001123661210314911210315174
ENSE00001463246210290150210290467
ENSE00003525590210293723210293800
ENSE00003547920210294245210294418
ENSE00003569484210302488210302515
ENSE00003600404210291032210291074
ENSE00003680167210298420210298563

Expression profiles

Bgee: expression breadth ubiquitous, 164 present calls, max score 99.94.

FANTOM5 (CAGE): breadth broad, TPM avg 49.1174 / max 12152.1140, expressed in 213 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
3347833.2683185
3348014.165696
334791.484236
2025560.111421
2025570.087818

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
biceps brachiiUBERON:000150799.94gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450299.94gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451199.92gold quality
body of tongueUBERON:001187699.92gold quality
gastrocnemiusUBERON:000138899.90gold quality
triceps brachiiUBERON:000150999.90gold quality
hindlimb stylopod muscleUBERON:000425299.89gold quality
diaphragmUBERON:000110399.87gold quality
quadriceps femorisUBERON:000137799.87gold quality
tibialis anteriorUBERON:000138599.87gold quality
skeletal muscle tissueUBERON:000113499.86gold quality
vastus lateralisUBERON:000137999.85gold quality
gluteal muscleUBERON:000200099.85gold quality
deltoidUBERON:000147699.76gold quality
muscle organUBERON:000163098.52gold quality
muscle of legUBERON:000138397.99gold quality
tongueUBERON:000172392.82gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047392.65gold quality
muscle tissueUBERON:000238591.43gold quality
pharyngeal mucosaUBERON:000035590.36gold quality
superior surface of tongueUBERON:000737187.50gold quality
trabecular bone tissueUBERON:000248381.88gold quality
oral cavityUBERON:000016780.55gold quality
minor salivary glandUBERON:000183075.89gold quality
mouth mucosaUBERON:000372975.45gold quality
apex of heartUBERON:000209873.50gold quality
tendon of biceps brachiiUBERON:000818873.08gold quality
heart left ventricleUBERON:000208470.71gold quality
vena cavaUBERON:000408769.97gold quality
cardiac ventricleUBERON:000208269.91gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-GEOD-124472yes5410.93
E-HCAD-56yes3197.53
E-ANND-5yes800.86
E-ANND-3no0.00

Regulation

Is transcription factor: no

Upstream regulators (CollecTRI, top): JARID2, MITF, MYOD1, MYOG

miRNA regulators (miRDB)

50 targeting MYL1, 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-4455100.0065.481587
HSA-MIR-186-5P99.9970.833707
HSA-MIR-806899.9873.852376
HSA-MIR-56899.9869.862084
HSA-MIR-365899.9673.874379
HSA-MIR-6772-5P99.9467.01577
HSA-MIR-219A-5P99.9173.36735
HSA-MIR-4782-3P99.8873.31735
HSA-MIR-6766-3P99.8873.38732
HSA-MIR-391999.8769.452489
HSA-MIR-548AR-3P99.8571.263889
HSA-MIR-548AZ-3P99.8270.563549
HSA-MIR-548BC99.8270.613524
HSA-MIR-548E-3P99.8270.593514
HSA-MIR-548F-3P99.8270.593540
HSA-MIR-60999.8264.26505
HSA-MIR-3180-5P99.8269.122422
HSA-MIR-548A-3P99.7670.583524
HSA-MIR-7856-5P99.7569.992901
HSA-MIR-4677-5P99.7070.091940
HSA-MIR-6512-3P99.6566.071468
HSA-MIR-6720-5P99.6566.221459
HSA-MIR-7156-5P99.6468.811369
HSA-MIR-449999.6267.291470
HSA-MIR-4756-3P99.6266.301319
HSA-MIR-445299.5068.451493
HSA-MIR-317199.4969.06776
HSA-MIR-444199.4966.563216
HSA-MIR-3140-5P99.3969.041136
HSA-MIR-520A-5P99.3566.721632

Literature-anchored findings (GeneRIF, showing 13)

  • In vitro degradation of human recombinant MLC1 by MMP-2 increased after ONOO(-) exposure of MLC1 in a concentration-dependent manner (PMID:20518849)
  • Influenza infection activates a series of signaling pathways that converge to induce myosin light chain (MLC) phosphorylation and remodeling of the actin cytoskeleton. (PMID:21731751)
  • Disturbed myosin binding of mutated hVLC-1 may provide a pathomechanism for the development of hypertrohic cardiomyopathy. (PMID:22131351)
  • MRK is a novel RhoC effector that controls LPA-stimulated cell invasion at least in part by regulating myosin dynamics, ERK and p38 (PMID:23319595)
  • This study provides an additional mechanistic link between Angiotensin II and vasoconstriction via SFK-enhanced MLC phosphorylation in smooth muscle cells. (PMID:26011449)
  • polymorphism of intron MYL1 was associated with endurance performance, specifically in endurance trainability, but not genetic predisposition, in human adults. (PMID:26473445)
  • these results provide new insights into the sequences and modifications of myosin light chain isoforms in the human and swine hearts, which will pave the way for a better understanding of their functional roles in cardiac physiology and pathophysiology. (PMID:28427997)
  • MLCK and phosphorylated MLC are potential prognostic indicators of leiomyosarcoma. (PMID:28618653)
  • These results support the concept of the ATP-induced transient interaction of the essential light chain-1 N-terminus with the motor domain of the myosin head. (PMID:29102634)
  • Our data implicate MYL1 as a crucial protein for adequate skeletal muscle function and that MYL1 deficiency is associated with severe congenital myopathy. (PMID:30215711)
  • MYBPC2 and MYL1 as Significant Gene Markers for Rhabdomyosarcoma. (PMID:33499774)
  • MYL2 as a potential predictive biomarker for rhabdomyosarcoma. (PMID:34596111)
  • Analysis of myosin genes in HNSCC and identify MYL1 as a specific poor prognostic biomarker, promotes tumor metastasis and correlates with tumor immune infiltration in HNSCC. (PMID:37679666)

Cross-species orthologs

7 orthologs

OrganismSymbolGene ID
danio_reriomyl1ENSDARG00000014196
danio_reriomylz3ENSDARG00000017441
mus_musculusMyl1ENSMUSG00000061816
rattus_norvegicusMyl1_v1ENSRNOG00000013262
drosophila_melanogasterMlc-cFBGN0004687
caenorhabditis_elegansWBGENE00010554
caenorhabditis_elegansWBGENE00011734

Paralogs (4): MYL6 (ENSG00000092841), MYL3 (ENSG00000160808), MYL6B (ENSG00000196465), MYL4 (ENSG00000198336)

Protein

Protein identifiers

Myosin light chain 1/3, skeletal muscle isoformP05976 (reviewed: P05976)

Alternative names: Myosin light chain alkali 1/2

All UniProt accessions (1): P05976

UniProt curated annotations — full annotation on UniProt →

Function. Non-regulatory myosin light chain required for proper formation and/or maintenance of myofibers, and thus appropriate muscle function.

Subunit / interactions. Myosin is a hexamer of 2 heavy chains and 4 light chains. Does not bind calcium.

Post-translational modifications. Acetylated at position 2.

Disease relevance. Congenital myopathy 14 (CMYO14) [MIM:618414] An autosomal recessive congenital myopathy characterized by decreased fetal movements, severe muscle weakness and respiratory failure. Additional features include delayed motor development, areflexia, facial weakness, normal eye movements, head lag, and mild contractures. Skeletal muscle biopsy shows variation in fiber size with atrophy of the fast-twitch type II fibers. The disease is caused by variants affecting the gene represented in this entry.

Isoforms (2)

UniProt IDNamesCanonical?
P05976-1MLC1yes
P05976-2MLC3

RefSeq proteins (2): NP_524144, NP_524146 (=MANE)

Domains & families (InterPro)

IDNameType
IPR002048EF_hand_domDomain
IPR011992EF-hand-dom_pairHomologous_superfamily
IPR050230CALM/Myosin/TropC-likeFamily

UniProt features (17 total): modified residue 6, domain 3, initiator methionine 2, chain 1, splice variant 1, sequence variant 1, sequence conflict 1, region of interest 1, compositionally biased region 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-P05976-F188.630.77

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 (6): 87, 99, 2, 2, 71, 73

Function

Pathways and Gene Ontology

Reactome pathways

2 pathways

IDPathway
R-HSA-390522Striated Muscle Contraction
R-HSA-397014Muscle contraction

MSigDB gene sets: 397 (showing top): HNF3ALPHA_Q6, GAANYNYGACNY_UNKNOWN, GOBP_CELLULAR_RESPONSE_TO_LIPID, TGACCTY_ERR1_Q2, MEF2_02, GOBP_VESICLE_MEDIATED_TRANSPORT, MODULE_16, MODULE_329, LHX3_01, GOBP_CELLULAR_RESPONSE_TO_OXYGEN_CONTAINING_COMPOUND, HUMMERICH_SKIN_CANCER_PROGRESSION_DN, GOBP_POSITIVE_REGULATION_OF_INTRACELLULAR_TRANSPORT, NIKOLSKY_BREAST_CANCER_22Q13_AMPLICON, MODULE_66, MODULE_118

GO Biological Process (2): muscle contraction (GO:0006936), muscle filament sliding (GO:0030049)

GO Molecular Function (2): calcium ion binding (GO:0005509), structural constituent of muscle (GO:0008307)

GO Cellular Component (7): cytosol (GO:0005829), muscle myosin complex (GO:0005859), myosin II complex (GO:0016460), myofibril (GO:0030016), sarcomere (GO:0030017), contractile muscle fiber (GO:0043292), myosin complex (GO:0016459)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Muscle contraction1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cytoplasm2
cellular anatomical structure2
contractile muscle fiber2
muscle system process1
muscle contraction1
actin-myosin filament sliding1
metal ion binding1
structural molecule activity1
myosin II complex1
myosin complex1
myofibril1
intracellular membraneless organelle1
supramolecular fiber1
actin cytoskeleton1
protein-containing complex1

Protein interactions and networks

STRING

2433 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
MYL1MLC1Q15049872
MYL1MYH2Q9UKX2756
MYL1ACTA1P02568719
MYL1TPM1P09493715
MYL1ACTN3Q08043651
MYL1CRYGAP11844649
MYL1TNNI2P48788646
MYL1TNNT3P45378627
MYL1TTNQ8WZ42626
MYL1MYH1P12882599
MYL1CASQ1P31415599
MYL1TPM3P06753596
MYL1MYL2P10916592
MYL1VIL1P09327592
MYL1TPM2P06468587

IntAct

60 interactions, top by confidence:

ABTypeScore
HSPB8VWA8psi-mi:“MI:0914”(association)0.530
S100A4OIP5psi-mi:“MI:0914”(association)0.530
MYL1PCNApsi-mi:“MI:0915”(physical association)0.370
COX15SNRPGP15psi-mi:“MI:0914”(association)0.350
DLSTpsi-mi:“MI:0914”(association)0.350
HSD17B10HMGB1P1psi-mi:“MI:0914”(association)0.350
HSD17B10HNRNPDLpsi-mi:“MI:0914”(association)0.350
COX15MYO1Cpsi-mi:“MI:0914”(association)0.350
BMI1MEIS3P1psi-mi:“MI:0914”(association)0.350
BCKDKAIPpsi-mi:“MI:0914”(association)0.350
CASKABLIM1psi-mi:“MI:0914”(association)0.350
PRKACBMYL1psi-mi:“MI:0914”(association)0.350
MAPTSHTN1psi-mi:“MI:0914”(association)0.350
CALM1MYO1Cpsi-mi:“MI:0914”(association)0.350
CALM3PLEKHG3psi-mi:“MI:0914”(association)0.350
SLC39A3PLEKHG3psi-mi:“MI:0914”(association)0.350
MECOMATP2A1psi-mi:“MI:0914”(association)0.350
RBMX2NSD2psi-mi:“MI:0914”(association)0.350
TLE3COL1A1psi-mi:“MI:0914”(association)0.350
HIF1AMYL1psi-mi:“MI:0914”(association)0.350
MYL4MYL1psi-mi:“MI:0914”(association)0.350
TNFSF14HAX1psi-mi:“MI:0914”(association)0.350
LATS1ATP2A1psi-mi:“MI:0914”(association)0.350
TSPAN33ATP2A1psi-mi:“MI:0914”(association)0.350
FKBP6VGFpsi-mi:“MI:0914”(association)0.350

BioGRID (65): IQGAP1 (Protein-peptide), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Reconstituted Complex), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS), MYL1 (Affinity Capture-MS)

ESM2 similar proteins: A0A125YHX7, A0JNJ5, F1RRT2, J7HCX7, O15182, O35648, P02600, P02602, P02604, P02605, P02606, P05434, P05976, P05977, P06742, P08590, P09540, P09541, P09542, P12829, P14649, P16409, P17209, P41044, P41208, P41209, P53014, P53441, P54213, P54357, P82159, P82160, P85100, Q06827, Q09196, Q12798, Q24621, Q24654, Q24756, Q27177

Diamond homologs: A0JNJ5, A2Y609, A3E3H0, A3E4D8, A3E4F9, A4UHC0, A8CEP3, A8I1Q0, F1RRT2, J7HCX7, O14008, O60041, O82018, O94739, P02597, P02598, P02600, P02602, P02604, P02605, P02606, P02607, P04353, P04464, P05419, P05976, P05977, P06742, P06787, P07290, P07291, P07462, P07463, P08053, P08590, P09540, P09541, P09542, P0DH95, P0DH96

SIGNOR signaling

1 interactions.

AEffectBMechanism
MAPK3up-regulatesMYL1phosphorylation

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic1
Uncertain significance23
Likely benign9
Benign18

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
4279087NM_079420.3(MYL1):c.479-25T>CLikely pathogenic

SpliceAI

801 predictions. Top by Δscore:

VariantEffectΔscore
2:210291029:TA:Tdonor_loss1.0000
2:210291030:A:ATdonor_loss1.0000
2:210291031:CCTT:Cdonor_loss1.0000
2:210291070:AAAAG:Aacceptor_gain1.0000
2:210291071:AAAG:Aacceptor_gain1.0000
2:210291072:AAG:Aacceptor_gain1.0000
2:210291073:AG:Aacceptor_gain1.0000
2:210291073:AGCTG:Aacceptor_loss1.0000
2:210291074:GCTG:Gacceptor_loss1.0000
2:210291075:C:CCacceptor_gain1.0000
2:210291075:CTGTA:Cacceptor_loss1.0000
2:210291076:T:Gacceptor_loss1.0000
2:210291084:C:CTacceptor_gain1.0000
2:210291085:A:Tacceptor_gain1.0000
2:210293722:C:CTdonor_loss1.0000
2:210294240:CTTA:Cdonor_loss1.0000
2:210294242:TACC:Tdonor_loss1.0000
2:210294243:A:ACdonor_gain1.0000
2:210294243:A:ATdonor_loss1.0000
2:210294243:AC:Adonor_gain1.0000
2:210294244:C:CAdonor_loss1.0000
2:210294244:C:CCdonor_gain1.0000
2:210294244:CC:Cdonor_gain1.0000
2:210294298:T:TAdonor_gain1.0000
2:210294414:CAGCT:Cacceptor_gain1.0000
2:210294415:AGCT:Aacceptor_gain1.0000
2:210294416:GCT:Gacceptor_gain1.0000
2:210294416:GCTCT:Gacceptor_loss1.0000
2:210294417:CT:Cacceptor_gain1.0000
2:210294417:CTC:Cacceptor_gain1.0000

AlphaMissense

1288 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
2:210294268:A:GL152P0.999
2:210294385:A:GF113S0.999
2:210298538:A:CF62L0.999
2:210298538:A:TF62L0.999
2:210298540:A:GF62L0.999
2:210298547:A:CF59L0.999
2:210298547:A:TF59L0.999
2:210298549:A:GF59L0.999
2:210291068:A:TV188D0.998
2:210293800:C:AG160V0.998
2:210293800:C:TG160D0.998
2:210294245:C:GG160R0.998
2:210294256:A:GL156P0.998
2:210294265:C:GR153P0.998
2:210294268:A:TL152H0.998
2:210294283:A:TV147D0.998
2:210294305:C:GD140H0.998
2:210294306:A:CF139L0.998
2:210294306:A:TF139L0.998
2:210294308:A:GF139L0.998
2:210294316:A:GL136P0.998
2:210294320:C:GG135R0.998
2:210298452:A:TV91D0.998
2:210298485:C:GR80P0.998
2:210298488:A:GL79P0.998
2:210298548:A:GF59S0.998
2:210293767:A:GL171P0.997
2:210294304:T:AD140V0.997
2:210294304:T:GD140A0.997
2:210294313:C:GR137P0.997

dbSNP variants (sampled 300 via entrez): RS1000115659 (2:210303712 A>G), RS1000128713 (2:210309764 G>A), RS1000178468 (2:210291383 C>G), RS1000261985 (2:210310056 C>A,T), RS1000314675 (2:210309727 T>A), RS1000553421 (2:210289953 T>G), RS1000792813 (2:210298184 G>A,C), RS1000826452 (2:210316214 C>G,T), RS1000845032 (2:210298000 G>A,T), RS1000926490 (2:210303172 G>A), RS1001007563 (2:210304859 G>C,T), RS1001091168 (2:210292182 C>A), RS1001246133 (2:210316710 A>T), RS1001467644 (2:210295543 A>G), RS1001523523 (2:210305137 G>A)

Disease associations

OMIM: gene MIM:160780 | disease phenotypes: MIM:618414

GenCC curated gene-disease

DiseaseClassificationInheritance
congenital myopathy with reduced type 2 muscle fibersModerateAutosomal recessive

ClinGen Gene-Disease Validity (1)

Expert-panel classifications — Definitive > Strong > Moderate > Limited > Disputed > Refuted.

DiseaseClassificationInheritance
congenital myopathyLimitedAR

Mondo (1): congenital myopathy with reduced type 2 muscle fibers (MONDO:0034109)

Orphanet (1): Congenital myopathy with reduced type 2 muscle fibers (Orphanet:544602)

HPO phenotypes

30 total (30 of 30 shown, HPO-id order):

HPOTerm
HP:0000007Autosomal recessive inheritance
HP:0000218High palate
HP:0000467Neck muscle weakness
HP:0001252Hypotonia
HP:0001270Motor delay
HP:0001284Areflexia
HP:0001371Flexion contracture
HP:0001522Death in infancy
HP:0001558Decreased fetal movement
HP:0001561Polyhydramnios
HP:0002058Myopathic facies
HP:0002104Apnea
HP:0002747Respiratory insufficiency due to muscle weakness
HP:0002878Respiratory failure
HP:0002987Elbow flexion contracture
HP:0003273Hip contracture
HP:0003324Generalized muscle weakness
HP:0003327Axial muscle weakness
HP:0003403EMG: decremental response of compound muscle action potential to repetitive nerve stimulation
HP:0003557Increased variability in muscle fiber diameter
HP:0003577Congenital onset
HP:0003701Proximal muscle weakness
HP:0003803Type 1 muscle fiber predominance
HP:0006380Knee flexion contracture
HP:0011968Feeding difficulties
HP:0030319Weakness of facial musculature
HP:0032988Persistent head lag
HP:0040081Abnormal circulating creatine kinase concentration
HP:0040288Nasogastric tube feeding
HP:0100297Increased endomysial connective tissue

GWAS associations

1 associations (top):

StudyTraitp-value
GCST006249_100Serum metabolite levels9.000000e-19

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

14 total (human), top 14 by PubMed support.

ChemicalActions (top 5)PubMed papers
methylmercuric chlorideincreases expression1
scoparonedecreases phosphorylation1
tanshinoneincreases expression1
CGP 52608affects binding, increases reaction1
deguelindecreases expression1
incobotulinumtoxinAdecreases expression1
Benzo(a)pyreneaffects methylation1
Clozapineincreases expression1
Ivermectindecreases expression1
Norepinephrineincreases phosphorylation, affects reaction1
Triclosanincreases expression1
1-Methyl-4-phenylpyridiniumincreases expression1
Aflatoxin B1decreases methylation1
Permethrindecreases expression1

Clinical trials (associated diseases)

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