chr12-120725886-A-G

Position:

• chr12-120725886-A-G

Variant summary

Our verdict is Pathogenic. Variant got 13 ACMG points: 13P and 0B. PVS1 PS1_Moderate PM2 PP5

The NM_000017.4(ACADS):​c.1A>G​(p.Met1?) variant causes a start lost change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000214 in 1,401,014 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: ACADS NM_000017.4 start_lost
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 1.90

Genes affected

ACADS (HGNC:90): (acyl-CoA dehydrogenase short chain) This gene encodes a tetrameric mitochondrial flavoprotein, which is a member of the acyl-CoA dehydrogenase family. This enzyme catalyzes the initial step of the mitochondrial fatty acid beta-oxidation pathway. Mutations in this gene have been associated with short-chain acyl-CoA dehydrogenase (SCAD) deficiency. Alternative splicing results in two variants which encode different isoforms. [provided by RefSeq, Oct 2014]

ACMG classification

Verdict is Pathogenic. Variant got 13 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_000017.4 (ACADS) was described as [Likely_pathogenic] in ClinVar as 2501121
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 12-120725886-A-G is Pathogenic according to our data. Variant chr12-120725886-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 552667.We mark this variant Likely_pathogenic, oryginal submissions are: {Pathogenic=1, Likely_pathogenic=2, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACADS	NM_000017.4	c.1A>G	p.Met1?	start_lost	1/10	ENST00000242592.9
ACADS	NM_001302554.2	c.1A>G	p.Met1?	start_lost	1/10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACADS	ENST00000242592.9	c.1A>G	p.Met1?	start_lost	1/10	1	NM_000017.4	P1
ACADS	ENST00000411593.2	c.1A>G	p.Met1?	start_lost	1/10	2
ACADS	ENST00000539690.1	n.113A>G		non_coding_transcript_exon_variant	1/3	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000641 AC: 1 AN: 156026 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 86736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000376

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000214 AC: 3 AN: 1401014 Hom.: 0 Cov.: 31 AF XY: 0.00000144 AC XY: 1 AN XY: 693956

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000264

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000124

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.17e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Deficiency of butyryl-CoA dehydrogenase Pathogenic:3 Uncertain:1

Pathogenic, criteria provided, single submitter	curation	Laboratory of Medical Genetics, National & Kapodistrian University of Athens	Feb 01, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	May 08, 2023	This variant disrupts a region of the ACADS protein in which other variant(s) (p.Arg23Trp) have been observed in individuals with ACADS-related conditions (Invitae). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. ClinVar contains an entry for this variant (Variation ID: 552667). This variant has not been reported in the literature in individuals affected with ACADS-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change affects the initiator methionine of the ACADS mRNA. The next in-frame methionine is located at codon 40. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Jun 26, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 07, 2021	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Benign	20
DANN	Benign	0.94
DEOGEN2	Benign	0.31	T;T
Eigen	Benign	-0.15
Eigen_PC	Benign	-0.18
FATHMM_MKL	Benign	0.73	D
LIST_S2	Uncertain	0.90	D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.97	D;D
MetaSVM	Uncertain	0.49	D
MutationTaster	Benign	1.0	D;D
PROVEAN	Benign	-0.56	N;N
REVEL	Pathogenic	0.67
Sift	Pathogenic	0.0	D;D
Sift4G	Uncertain	0.016	D;D
Polyphen		0.14	B;P
Vest4		0.82
MutPred		0.75		Loss of MoRF binding (P = 0.1128);Loss of MoRF binding (P = 0.1128);
MVP		0.96
ClinPred		0.94	D
GERP RS		3.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.95
gMVP		0.60

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs1291226969; hg19: chr12-121163689;