12-109191848-C-G

Variant names:

• chr12-109191848-C-G
• rs754505331
• NM_001093.4:c.2297C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001093.4(ACACB):​c.2297C>G​(p.Ala766Gly) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,874 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ACACB NM_001093.4 missense, splice_region
• Scores: Splicing: ADA: 0.9776
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.90
• Publications: 0 publications found

Genes affected

ACACB (HGNC:85): (acetyl-CoA carboxylase beta) Acetyl-CoA carboxylase (ACC) is a complex multifunctional enzyme system. ACC is a biotin-containing enzyme which catalyzes the carboxylation of acetyl-CoA to malonyl-CoA, the rate-limiting step in fatty acid synthesis. ACC-beta is thought to control fatty acid oxidation by means of the ability of malonyl-CoA to inhibit carnitine-palmitoyl-CoA transferase I, the rate-limiting step in fatty acid uptake and oxidation by mitochondria. ACC-beta may be involved in the regulation of fatty acid oxidation, rather than fatty acid biosynthesis. [provided by RefSeq, Oct 2022]

ACACB Gene-Disease associations (from GenCC):

• isolated cleft palate

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001093.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACACB	NM_001093.4	MANE Select	c.2297C>G	p.Ala766Gly	missense splice_region	Exon 15 of 53	NP_001084.3	O00763-1
	ACACB	NM_001412734.1		c.2297C>G	p.Ala766Gly	missense splice_region	Exon 16 of 54	NP_001399663.1	O00763-1
	ACACB	NM_001412735.1		c.2297C>G	p.Ala766Gly	missense splice_region	Exon 15 of 53	NP_001399664.1	O00763-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ACACB	ENST00000338432.12	TSL:1 MANE Select	c.2297C>G	p.Ala766Gly	missense splice_region	Exon 15 of 53	ENSP00000341044.7	O00763-1
	ACACB	ENST00000377848.7	TSL:1	c.2297C>G	p.Ala766Gly	missense splice_region	Exon 14 of 52	ENSP00000367079.3	O00763-1
	ACACB	ENST00000377854.9	TSL:5	c.-1706C>G		splice_region	Exon 14 of 47	ENSP00000367085.6	F8W8T8

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461874 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 727240

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86254

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1112000

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.20
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.17
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.76	D
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Pathogenic	0.97	D
M_CAP	Uncertain	0.24	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.3	M
PhyloP100		7.9
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-2.7	D
REVEL	Pathogenic	0.83
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0010	D
Polyphen		0.99	D
Vest4		0.72
MutPred		0.46		Gain of catalytic residue at V764 (P = 0.0113)
MVP		0.65
MPC		0.62
ClinPred		0.99	D
GERP RS		5.4
Varity_R		0.52
gMVP		0.57
Mutation Taster		=61/39	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Pathogenic	0.90
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs754505331; hg19: chr12-109629653;