12-109139424-C-T

Position:

• chr12-109139424-C-T

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_Strong BP6_Very_Strong BP7 BS1 BS2

The NM_001093.4(ACACB):​c.19C>T​(p.Leu7=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00179 in 1,613,358 control chromosomes in the GnomAD database, including 36 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0086 (19 hom., cov: 32)
  • Exomes 𝑓: 0.0011 (17 hom.)
• Consequence: ACACB NM_001093.4 synonymous
• Clinical Significance: Benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 0.00900

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]

ACMG classification

Verdict is Benign. Variant got -21 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.48).
• BP6: Variant 12-109139424-C-T is Benign according to our data. Variant chr12-109139424-C-T is described in ClinVar as [Benign]. Clinvar id is 768579.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BP7: Synonymous conserved (PhyloP=0.009 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0086 (1310/152296) while in subpopulation AFR AF= 0.0296 (1231/41556). AF 95% confidence interval is 0.0282. There are 19 homozygotes in gnomad4. There are 608 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 19 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACACB	NM_001093.4	c.19C>T	p.Leu7=	synonymous_variant	2/53	ENST00000338432.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACACB	ENST00000338432.12	c.19C>T	p.Leu7=	synonymous_variant	2/53	1	NM_001093.4	P1
ACACB	ENST00000377848.7	c.19C>T	p.Leu7=	synonymous_variant	1/52	1		P1
ACACB	ENST00000377854.9	c.-3984C>T		5_prime_UTR_variant	1/47	5
ACACB	ENST00000539864.1	c.-57C>T		5_prime_UTR_variant	2/2	3

Frequencies

GnomAD3 genomes AF: 0.00858 AC: 1305 AN: 152178 Hom.: 19 Cov.: 32

Gnomad AFR AF: 0.0296

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00249

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.000294

Gnomad OTH AF: 0.00860

GnomAD3 exomes AF: 0.00223 AC: 560 AN: 250772 Hom.: 7 AF XY: 0.00170 AC XY: 230 AN XY: 135572

Gnomad AFR exome AF: 0.0293

Gnomad AMR exome AF: 0.00125

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000131

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000238

Gnomad OTH exome AF: 0.00164

GnomAD4 exome AF: 0.00108 AC: 1579 AN: 1461062 Hom.: 17 Cov.: 30 AF XY: 0.000952 AC XY: 692 AN XY: 726822

Gnomad4 AFR exome AF: 0.0324

Gnomad4 AMR exome AF: 0.00150

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000151

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000217

Gnomad4 OTH exome AF: 0.00249

GnomAD4 genome AF: 0.00860 AC: 1310 AN: 152296 Hom.: 19 Cov.: 32 AF XY: 0.00816 AC XY: 608 AN XY: 74482

Gnomad4 AFR AF: 0.0296

Gnomad4 AMR AF: 0.00248

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000294

Gnomad4 OTH AF: 0.00851

Alfa AF: 0.00344 Hom.: 4

Bravo AF: 0.00975

Asia WGS AF: 0.00173 AC: 6 AN: 3478

EpiCase AF: 0.000164

EpiControl AF: 0.000415

ClinVar

Significance: Benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 31, 2019	- -
Benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

ACACB-related disorder Benign:1

Benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 18, 2020

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.48
CADD	Benign	3.2
DANN	Benign	0.71

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs79484712; hg19: chr12-109577229;