ACSM2A

gene
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Also known as A-923A4.1MGC150530

Summary

ACSM2A (acyl-CoA synthetase medium chain family member 2A, HGNC:32017) is a protein-coding gene on chromosome 16p12.3, encoding Acyl-coenzyme A synthetase ACSM2A, mitochondrial (Q08AH3). Catalyzes the activation of fatty acids by CoA to produce an acyl-CoA, the first step in fatty acid metabolism.

This gene encodes a mitochondrial acyl-coenzyme A synthetase that is specific for medium chain fatty acids. These enzymes catalyze fatty acid activation, the first step of fatty acid metabolism, through the transfer of acyl-CoA. These enzymes also participate in the glycine conjugation pathway in the detoxification of xenobiotics such as benzoate and ibuprofen. Expression levels of this gene in the kidney may be correlated with kidney function. This gene and its paralog ACSM2B (Gene ID: 348158), both present on chromosome 16, likely arose from a chromosomal duplication event.

Source: NCBI Gene 123876 — RefSeq curated summary.

At a glance

  • GWAS associations: 6
  • Clinical variants (ClinVar): 129 total — 1 pathogenic
  • MANE Select transcript: NM_001308172

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:32017
Approved symbolACSM2A
Nameacyl-CoA synthetase medium chain family member 2A
Location16p12.3
Locus typegene with protein product
StatusApproved
AliasesA-923A4.1, MGC150530
Ensembl geneENSG00000183747
Ensembl biotypeprotein_coding
OMIM614358
Entrez123876

Gene structure

Transcript identifiers

Ensembl transcripts: 34 — 26 protein_coding, 4 retained_intron, 3 protein_coding_CDS_not_defined, 1 nonsense_mediated_decay

ENST00000219054, ENST00000396104, ENST00000417235, ENST00000570698, ENST00000571204, ENST00000571894, ENST00000572843, ENST00000572921, ENST00000573854, ENST00000574251, ENST00000574692, ENST00000575558, ENST00000575690, ENST00000576101, ENST00000576119, ENST00000576361, ENST00000910835, ENST00000910836, ENST00000910837, ENST00000910838, ENST00000910839, ENST00000910840, ENST00000910841, ENST00000910842, ENST00000910843, ENST00000910844, ENST00000910845, ENST00000910846, ENST00000910847, ENST00000910848, ENST00000910849, ENST00000910850, ENST00000910851, ENST00000910852

RefSeq mRNA: 3 — MANE Select: NM_001308172 NM_001308169, NM_001308172, NM_001308954

CCDS: CCDS32401, CCDS76838

Canonical transcript exons

ENST00000573854 — 14 exons

ExonStartEnd
ENSE000034656742047536220475441
ENSE000034682852048057320480700
ENSE000034718902046951220469719
ENSE000034915542048082220480921
ENSE000034924292047736920477449
ENSE000035085792046551720465727
ENSE000035477862047565020475773
ENSE000035567332048305820483177
ENSE000035705462047153620471689
ENSE000036061362047857620478677
ENSE000036085142047107320471216
ENSE000036553202046010720460291
ENSE000038432642045152120451681
ENSE000038432862048657420487669

Expression profiles

Bgee: expression breadth ubiquitous, 128 present calls, max score 99.12.

FANTOM5 (CAGE): breadth tissue_specific, TPM avg 0.3723 / max 149.7032, expressed in 16 samples.

FANTOM5 promoters (6 alternative TSS)

Promoter IDTPM avgSamples expressed
2078010.126814
1530580.089411
2078020.071514
1530610.069512
1530590.01186
1530600.00331

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
right lobe of liverUBERON:000111499.12gold quality
liverUBERON:000210798.64gold quality
adult mammalian kidneyUBERON:000008297.15gold quality
kidneyUBERON:000211392.93gold quality
cortex of kidneyUBERON:000122583.52gold quality
metanephros cortexUBERON:001053383.29gold quality
metanephric glomerulusUBERON:000473676.91gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047376.85gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099168.91gold quality
sural nerveUBERON:001548864.26silver quality
vastus lateralisUBERON:000137960.14gold quality
quadriceps femorisUBERON:000137760.02gold quality
tracheaUBERON:000312659.07gold quality
dorsal plus ventral thalamusUBERON:000189759.03gold quality
dorsal root ganglionUBERON:000004458.67gold quality
epithelium of bronchusUBERON:000203158.19gold quality
layer of synovial tissueUBERON:000761657.91gold quality
cerebellar vermisUBERON:000472057.59gold quality
thymusUBERON:000237057.33gold quality
mucosa of stomachUBERON:000119955.45gold quality
superior frontal gyrusUBERON:000266152.69gold quality
calcaneal tendonUBERON:000370152.60gold quality
hindlimb stylopod muscleUBERON:000425251.69gold quality
primary visual cortexUBERON:000243651.23gold quality
ventricular zoneUBERON:000305351.18gold quality
frontal poleUBERON:000279550.41gold quality
prefrontal cortexUBERON:000045150.34gold quality
apex of heartUBERON:000209850.34gold quality
middle frontal gyrusUBERON:000270250.30gold quality
paraflocculusUBERON:000535150.18gold quality

Single-cell (SCXA)

Detected in 5 experiment(s), a significant marker in 5.

ExperimentMarker?Max mean expression
E-GEOD-131882yes5924.06
E-CURD-135yes5751.37
E-CURD-119yes5697.89
E-HCAD-10yes32.91
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

78 targeting ACSM2A, 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-6833-3P100.0070.633197
HSA-MIR-6873-3P100.0071.422626
HSA-MIR-4768-5P100.0069.492861
HSA-MIR-7110-3P100.0073.182486
HSA-MIR-607799.9968.042299
HSA-MIR-186-5P99.9970.833707
HSA-MIR-34A-5P99.9971.211784
HSA-MIR-449A99.9971.051776
HSA-MIR-34C-5P99.9770.451577
HSA-MIR-449B-5P99.9770.261580
HSA-MIR-4778-3P99.9370.401818
HSA-MIR-6753-3P99.9366.57637
HSA-MIR-7107-3P99.9366.73627
HSA-MIR-6809-3P99.9171.453814
HSA-MIR-4753-3P99.9071.033786
HSA-MIR-627-3P99.9071.423316
HSA-MIR-612499.8769.783551
HSA-MIR-5003-3P99.8569.292517
HSA-MIR-629-3P99.8567.991875
HSA-MIR-130B-5P99.8368.501888
HSA-MIR-6875-3P99.8270.262983
HSA-MIR-94499.8270.853042
HSA-MIR-4659A-3P99.8072.624248
HSA-MIR-4659B-3P99.8072.624248
HSA-MIR-204-5P99.7971.622439
HSA-MIR-211-5P99.7971.652440
HSA-MIR-4713-5P99.7867.801794
HSA-MIR-62399.7668.161170
HSA-MIR-4755-5P99.7170.342716
HSA-MIR-5006-3P99.7170.262728

Literature-anchored findings (GeneRIF, showing 2)

  • Results report the first crystal structure of a medium-chain acyl-CoA synthetase ACSM2A, in a series of substrate/product/cofactor complexes central to the catalytic mechanism. (PMID:19345228)
  • This study assessed the naturally observed sequence diversity and protein expression variation of ACSM2A and ACSM2B. The allelic variation, haplotype diversity, Tajima’s D values, and phylogenetic analyses indicated that ACSM2A and ACSM2B are highly conserved.The protein expression analyses showed that ACSM2A is the predominant transcript in liver. (PMID:29948332)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_rerioacss2lENSDARG00000069029
mus_musculusAcsm2ENSMUSG00000030945
rattus_norvegicusAcsm2ENSRNOG00000064951
caenorhabditis_elegansWBGENE00009221
caenorhabditis_elegansWBGENE00018488

Paralogs (13): ACSM3 (ENSG00000005187), ACSM2B (ENSG00000066813), AACS (ENSG00000081760), ACSS3 (ENSG00000111058), ACSS2 (ENSG00000131069), ACSS1 (ENSG00000154930), AASDH (ENSG00000157426), ACSM1 (ENSG00000166743), ACSF2 (ENSG00000167107), ACSM6 (ENSG00000173124), ACSF3 (ENSG00000176715), ACSM5 (ENSG00000183549), ACSM4 (ENSG00000215009)

Protein

Protein identifiers

Acyl-coenzyme A synthetase ACSM2A, mitochondrialQ08AH3 (reviewed: Q08AH3)

Alternative names: Acyl-CoA synthetase medium-chain family member 2A, Benzoate–CoA ligase, Butyrate–CoA ligase 2A, Butyryl-coenzyme A synthetase 2A, Middle-chain acyl-CoA synthetase 2A

All UniProt accessions (6): E7EPS5, Q08AH3, F5GWL3, I3L2Y5, I3L339, I3L438

UniProt curated annotations — full annotation on UniProt →

Function. Catalyzes the activation of fatty acids by CoA to produce an acyl-CoA, the first step in fatty acid metabolism. Capable of activating medium-chain fatty acids (e.g. butyric (C4) to decanoic (C10) acids), and certain carboxylate-containing xenobiotics, e.g. benzoate.

Subunit / interactions. Monomer.

Subcellular location. Mitochondrion.

Similarity. Belongs to the ATP-dependent AMP-binding enzyme family.

RefSeq proteins (3): NP_001295098, NP_001295101, NP_001295883 (=MANE)

Domains & families (InterPro)

IDNameType
IPR000873AMP-dep_synth/lig_domDomain
IPR020845AMP-binding_CSConserved_site
IPR025110AMP-bd_CDomain
IPR042099ANL_N_sfHomologous_superfamily
IPR045851AMP-b_sfHomologous_superfamily
IPR051087Mitochondrial_ACSMFamily

Pfam: PF00501, PF13193

Catalyzed reactions (Rhea), 6 shown:

  • benzoate + ATP + CoA = benzoyl-CoA + AMP + diphosphate (RHEA:10132)
  • decanoate + ATP + CoA = decanoyl-CoA + AMP + diphosphate (RHEA:33627)
  • octanoate + ATP + CoA = octanoyl-CoA + AMP + diphosphate (RHEA:33631)
  • hexanoate + ATP + CoA = hexanoyl-CoA + AMP + diphosphate (RHEA:43740)
  • butanoate + ATP + CoA = butanoyl-CoA + AMP + diphosphate (RHEA:46172)
  • a medium-chain fatty acid + ATP + CoA = a medium-chain fatty acyl-CoA + AMP + diphosphate (RHEA:48340)

UniProt features (75 total): strand 27, helix 21, binding site 12, turn 7, sequence variant 4, transit peptide 1, chain 1, modified residue 1, sequence conflict 1

Structure

Experimental structures (PDB)

7 structures.

PDBMethodResolution (Å)
3C5EX-RAY DIFFRACTION1.6
3GPCX-RAY DIFFRACTION1.9
3DAYX-RAY DIFFRACTION1.95
3B7WX-RAY DIFFRACTION2
3EQ6X-RAY DIFFRACTION2.4
2VZEX-RAY DIFFRACTION2.45
2WD9X-RAY DIFFRACTION2.6

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q08AH3-F191.420.83

Functional residue map

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

Ligand- & substrate-binding residues (12): 501; 532; 540–542; 557; 139; 221–229; 359–364; 364; 446; 461; 469–471; 472

Post-translational modifications (1): 513

Function

Pathways and Gene Ontology

Reactome pathways

8 pathways

IDPathway
R-HSA-177128Conjugation of salicylate with glycine
R-HSA-9749641Aspirin ADME
R-HSA-1430728Metabolism
R-HSA-156580Phase II - Conjugation of compounds
R-HSA-156587Amino Acid conjugation
R-HSA-159424Conjugation of carboxylic acids
R-HSA-211859Biological oxidations
R-HSA-9748784Drug ADME

MSigDB gene sets: 109 (showing top): GOBP_ACYLGLYCEROL_HOMEOSTASIS, REACTOME_BIOLOGICAL_OXIDATIONS, GNF2_HPN, GOBP_ORGANOPHOSPHATE_METABOLIC_PROCESS, GOBP_MONOCARBOXYLIC_ACID_METABOLIC_PROCESS, GOBP_ORGANIC_ACID_BIOSYNTHETIC_PROCESS, GOBP_NUCLEOBASE_CONTAINING_SMALL_MOLECULE_METABOLIC_PROCESS, GOBP_LIPID_HOMEOSTASIS, GOBP_SMALL_MOLECULE_BIOSYNTHETIC_PROCESS, GOBP_FATTY_ACYL_COA_METABOLIC_PROCESS, GOBP_AMIDE_METABOLIC_PROCESS, GOBP_FATTY_ACID_BIOSYNTHETIC_PROCESS, GOBP_MONOCARBOXYLIC_ACID_BIOSYNTHETIC_PROCESS, KIM_GERMINAL_CENTER_T_HELPER_DN, GOBP_LIPID_METABOLIC_PROCESS

GO Biological Process (7): fatty acid biosynthetic process (GO:0006633), acyl-CoA metabolic process (GO:0006637), medium-chain fatty-acyl-CoA metabolic process (GO:0036112), glucose homeostasis (GO:0042593), triglyceride homeostasis (GO:0070328), lipid metabolic process (GO:0006629), fatty acid metabolic process (GO:0006631)

GO Molecular Function (12): fatty-acyl-CoA synthase activity (GO:0004321), ATP binding (GO:0005524), fatty acid ligase activity (GO:0015645), benzoate-CoA ligase activity (GO:0018858), medium-chain fatty acid-CoA ligase activity (GO:0031956), metal ion binding (GO:0046872), decanoate-CoA ligase activity (GO:0102391), nucleotide binding (GO:0000166), CoA-ligase activity (GO:0016405), ligase activity (GO:0016874), ligase activity, forming carbon-sulfur bonds (GO:0016877), acid-thiol ligase activity (GO:0016878)

GO Cellular Component (2): mitochondrion (GO:0005739), mitochondrial matrix (GO:0005759)

Reactome top-level categories

Rollup of top-6 pathways:

CategoryPathways
Conjugation of carboxylic acids1
Drug ADME1
Biological oxidations1
Phase II - Conjugation of compounds1
Amino Acid conjugation1
Metabolism1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
acid-thiol ligase activity2
fatty acid metabolic process1
lipid biosynthetic process1
monocarboxylic acid biosynthetic process1
nucleoside phosphate metabolic process1
sulfur compound metabolic process1
purine-containing compound metabolic process1
fatty-acyl-CoA metabolic process1
carbohydrate homeostasis1
acylglycerol homeostasis1
primary metabolic process1
lipid metabolic process1
monocarboxylic acid metabolic process1
acyltransferase activity, transferring groups other than amino-acyl groups1
adenyl ribonucleotide binding1
purine ribonucleoside triphosphate binding1
ATP-dependent activity1
CoA-ligase activity1
fatty acid-CoA ligase activity1
cation binding1
medium-chain fatty acid-CoA ligase activity1
nucleoside phosphate binding1
heterocyclic compound binding1
catalytic activity1
ligase activity1
ligase activity, forming carbon-sulfur bonds1
cytoplasm1
intracellular membrane-bounded organelle1
mitochondrion1
intracellular organelle lumen1

Protein interactions and networks

STRING

1650 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
ACSM2AGLYATQ6IB77572
ACSM2AAASDHQ4L235540
ACSM2AFAM47EQ6ZV65443
ACSM2AIVDP26440353
ACSM2ASUOXP51687342
ACSM2AHACL1Q9UJ83336
ACSM2AACSBG2Q5FVE4334
ACSM2AACCSQ96QU6312
ACSM2AACSBG1Q96GR2297
ACSM2AACOT12Q8WYK0288
ACSM2ACRATP43155288
ACSM2ACFAP144A6NL82288
ACSM2AALDH8A1Q9H2A2282
ACSM2AACOT4Q8N9L9281
ACSM2AACADSP16219279

IntAct

4 interactions, top by confidence:

ABTypeScore
ACSM2Apsi-mi:“MI:0915”(physical association)0.370
AP3B1psi-mi:“MI:0914”(association)0.350
ACSM2BHSPA8psi-mi:“MI:0914”(association)0.350

BioGRID (3): ACSM2A (Affinity Capture-MS), ACSM2A (Affinity Capture-MS), ACSM3 (Negative Genetic)

ESM2 similar proteins: A4IHY0, H9A1V3, M4IRL9, O70490, P0C7M7, P39062, Q08AH1, Q08AH3, Q0P4F7, Q17QJ1, Q3TMV7, Q3UNX5, Q3URE1, Q499N5, Q4G176, Q4R3Y4, Q4R4Z9, Q4R510, Q53FZ2, Q58DN7, Q5E9H9, Q5EA45, Q5I0K5, Q5R9G9, Q5RDY4, Q5REV5, Q5REX5, Q67Y55, Q68CK6, Q6AYT9, Q6GLK6, Q6P1M0, Q6P461, Q6PE15, Q6SKG1, Q7T0X7, Q7TN78, Q80W40, Q84P17, Q8K0L3

Diamond homologs: A0A0H2ZF83, A0A0H2ZGB9, A8NF97, A9W5V0, B7KPN8, G3J456, M4IQQ5, M4ISH2, O07899, O53521, O60011, P0C7M7, P10378, P38135, P39002, P40871, P71716, P80436, P86831, P86832, P9WEY3, P9WEZ0, Q01574, Q08AH1, Q08AH3, Q1IAK8, Q21LV0, Q2G512, Q2KHW5, Q53FZ2, Q5P603, Q5REV5, Q5SKN9, Q5ZKR7, Q68CK6, Q6SKG1, Q6ZAC1, Q7TYX8, Q7X279, Q84HC5

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic1
Likely pathogenic0
Uncertain significance109
Likely benign9
Benign2

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
375693maternal UPD(16p)Pathogenic

SpliceAI

2221 predictions. Top by Δscore:

VariantEffectΔscore
16:20460229:G:GTdonor_gain1.0000
16:20469715:CTAAA:Cdonor_gain1.0000
16:20469718:AA:Adonor_gain1.0000
16:20469720:G:GGdonor_gain1.0000
16:20471070:CA:Cacceptor_loss1.0000
16:20471071:A:AGacceptor_gain1.0000
16:20471071:A:ATacceptor_loss1.0000
16:20471072:G:GGacceptor_gain1.0000
16:20471072:GT:Gacceptor_gain1.0000
16:20471072:GTGA:Gacceptor_gain1.0000
16:20471215:GG:Gdonor_gain1.0000
16:20471216:GG:Gdonor_gain1.0000
16:20475648:A:AGacceptor_gain1.0000
16:20475649:G:GGacceptor_gain1.0000
16:20477445:TACAG:Tdonor_loss1.0000
16:20477446:ACAG:Adonor_loss1.0000
16:20477448:AG:Adonor_loss1.0000
16:20477450:G:GGdonor_loss1.0000
16:20477451:T:Gdonor_loss1.0000
16:20477476:G:GTdonor_gain1.0000
16:20478650:GCCTA:Gdonor_gain1.0000
16:20480563:T:TAacceptor_gain1.0000
16:20480569:CCA:Cacceptor_loss1.0000
16:20480570:CA:Cacceptor_loss1.0000
16:20480571:A:AGacceptor_gain1.0000
16:20480571:A:ATacceptor_loss1.0000
16:20480572:G:GGacceptor_gain1.0000
16:20480572:GGAC:Gacceptor_gain1.0000
16:20480572:GGACA:Gacceptor_gain1.0000
16:20480649:A:Gdonor_gain1.0000

AlphaMissense

0 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000014458 (16:20459963 T>A), RS1000169865 (16:20485614 TAAAA>T), RS1000328189 (16:20457357 A>T), RS1000378752 (16:20462515 C>T), RS1000394282 (16:20457616 C>A,G), RS1000428333 (16:20478150 G>A,C,T), RS1000533926 (16:20465423 A>G), RS1000601987 (16:20461229 A>G,T), RS1000688565 (16:20462273 G>A), RS1000748491 (16:20456126 A>G), RS1000770370 (16:20486485 G>C), RS1001056616 (16:20469501 G>T), RS1001140229 (16:20461524 A>G,T), RS1001237318 (16:20463160 A>C,T), RS1001320423 (16:20469331 G>A)

Disease associations

OMIM: gene MIM:614358 | disease phenotypes:

GenCC curated gene-disease

Mondo (1): hemimegalencephaly (MONDO:0020492)

Orphanet (1): Hemimegalencephaly (Orphanet:99802)

HPO phenotypes

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

GWAS associations

6 associations (top):

StudyTraitp-value
GCST009733_26Urinary metabolite levels in chronic kidney disease1.000000e-30
GCST012020_174Serum metabolite levels4.000000e-24
GCST012020_200Serum metabolite levels2.000000e-17
GCST012020_464Serum metabolite levels5.000000e-13
GCST012021_55Serum metabolite levels4.000000e-24
GCST012021_75Serum metabolite levels2.000000e-17

EFO canonical traits (1, from GWAS)

EFO IDTrait name
EFO:0005116urinary metabolite measurement

MeSH disease descriptors (1)

DescriptorNameTree numbers
D065705HemimegalencephalyC05.660.207.536.500; C10.500.507.400.249.500; C16.131.621.207.532.500; C16.131.666.507.400.249.500

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

26 total (human), top 26 by PubMed support.

ChemicalActions (top 5)PubMed papers
Acetaminophenaffects cotreatment, decreases expression3
Benzo(a)pyrenedecreases expression3
Resveratrolaffects cotreatment, decreases expression2
Aflatoxin B1decreases expression2
dicrotophosdecreases expression1
methyleugenoldecreases expression1
bisphenol Aaffects expression1
tris(2-butoxyethyl) phosphateaffects expression1
sodium arsenitedecreases expression1
perfluoro-n-nonanoic aciddecreases expression1
Chenodeoxycholic Acidaffects cotreatment, decreases expression1
Copperaffects cotreatment, decreases expression1
Deoxycholic Acidaffects cotreatment, decreases expression1
Glycochenodeoxycholic Aciddecreases expression, affects cotreatment1
Glycocholic Acidaffects cotreatment, decreases expression1
Glycodeoxycholic Acidaffects cotreatment, decreases expression1
N-Nitrosopyrrolidinedecreases expression1
Plant Extractsdecreases expression, affects cotreatment1
Silicon Dioxidedecreases expression1
Tartrazineaffects cotreatment, decreases expression1
Tetrachlorodibenzodioxinaffects expression1
Urethanedecreases expression1
Valproic Aciddecreases expression, increases methylation1
Cyclosporinedecreases methylation1
Palmitic Aciddecreases expression1
Okadaic Aciddecreases expression1

Clinical trials (associated diseases)

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

TrialPhaseStatusTitle
NCT07287202PHASE1/PHASE2NOT_YET_RECRUITINGSafety, Tolerability, and Pharmacokinetics of SVG103 (Paxalisib) in Focal Cortical Dysplasia Type II (FCD-II), Tuberous Sclerosis Complex (TSC) or Hemimegalencephaly (HME)
NCT04344626Not specifiedWITHDRAWNUse of a Tonometer to Identify Epileptogenic Lesions During Pediatric Epilepsy Surgery
  • Disease cohort memberships (association, not causation — diseases whose associated-gene cohort lists this gene; a subset are also under Associated diseases): hemimegalencephaly