17-7222080-A-G

Position:

• chr17-7222080-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_000018.4(ACADVL):​c.751A>G​(p.Ser251Gly) variant causes a missense, splice region change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000752 in 1,461,868 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: 0.0000075 (0 hom.)
• Consequence: ACADVL NM_000018.4 missense, splice_region
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:4
• Conservation: PhyloP100: 8.17

Genes affected

ACADVL (HGNC:92): (acyl-CoA dehydrogenase very long chain) The protein encoded by this gene is targeted to the inner mitochondrial membrane where it catalyzes the first step of the mitochondrial fatty acid beta-oxidation pathway. This acyl-Coenzyme A dehydrogenase is specific to long-chain and very-long-chain fatty acids. A deficiency in this gene product reduces myocardial fatty acid beta-oxidation and is associated with cardiomyopathy. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.959
• PP5: Variant 17-7222080-A-G is Pathogenic according to our data. Variant chr17-7222080-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 324989.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Uncertain_significance=3, Pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ACADVL	NM_000018.4	c.751A>G	p.Ser251Gly	missense_variant, splice_region_variant	8/20	ENST00000356839.10	NP_000009.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ACADVL	ENST00000356839.10	c.751A>G	p.Ser251Gly	missense_variant, splice_region_variant	8/20	1	NM_000018.4	ENSP00000349297	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000119 AC: 3 AN: 251484 Hom.: 0 AF XY: 0.00000736 AC XY: 1 AN XY: 135918

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.0000264

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000752 AC: 11 AN: 1461868 Hom.: 0 Cov.: 32 AF XY: 0.00000688 AC XY: 5 AN XY: 727236

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000809

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000789 Hom.: 0

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Very long chain acyl-CoA dehydrogenase deficiency Pathogenic:3 Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Nov 03, 2020	The ACADVL c.751A>G; p.Ser251Gly (rs749159573) is reported in trans to a pathogenic variant in an infant with VLCAD deficiency (Scott Schwoerer 2015). The variant is reported in the ClinVar database (Variation ID: 324989) and is found in the general population with an overall allele frequency of 0.001% (3/251,484 alleles) in the Genome Aggregation Database. The serine at codon 251 is highly conserved and computational analyses predict that this variant is deleterious (REVEL: 0.978). However, given the lack of clinical and functional data, the significance of the p.Ser251Gly variant is uncertain at this time. References: Scott Schwoerer J et al. Rhabdomyolysis in a neonate due to very long chain acyl CoA dehydrogenase deficiency. Mol Genet Metab Rep. 2015 Mar 30;3:39-41. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Mar 08, 2023	Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. ClinVar contains an entry for this variant (Variation ID: 324989). This missense change has been observed in individual(s) with very long chain acyl CoA dehydrogenase deficiency (VLCAD) deficiency confirmed by biochemical assays (PMID: 26937394; Invitae). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. This variant is present in population databases (rs749159573, gnomAD 0.003%). This sequence change replaces serine, which is neutral and polar, with glycine, which is neutral and non-polar, at codon 251 of the ACADVL protein (p.Ser251Gly). For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Wong Mito Lab, Molecular and Human Genetics, Baylor College of Medicine	Nov 01, 2019	The NM_000018.3:c.751A>G (NP_000009.1:p.Ser251Gly) [GRCH38: NC_000017.11:g.7222080A>G] variant in ACADVL gene is interpretated to be Likely Pathogenic based on ACMG guidelines (PMID: 25741868). This variant has been reported. This variant meets the following evidence codes reported in the ACMG guidelines: PS3, PM3, PP3, PP4 -
Uncertain significance, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Nov 19, 2021	NM_000018.3(ACADVL):c.751A>G(S251G) is a missense variant classified as a variant of uncertain significance in the context of very-long-chain acyl-CoA dehydrogenase deficiency. S251G has been observed in cases with relevant disease (PMID: 26385305, 26937394). Functional assessments of this variant are not available in the literature. S251G has been observed in population frequency databases (gnomAD: NFE <0.001%). In summary, there is insufficient evidence to classify NM_000018.3(ACADVL):c.751A>G(S251G) as pathogenic or benign. Please note: this variant was assessed in the context of healthy population screening. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Nov 18, 2023	- -

ACADVL-related disorder Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 17, 2024

The ACADVL c.751A>G variant is predicted to result in the amino acid substitution p.Ser251Gly. This variant has been reported on the opposite allele (i.e., in trans) of a pathogenic ACADVL variant in a single patient with abnormal newborn screening and an episode of rhabdomyolysis concerning for very long chain acyl-CoA dehydrogenase deficiency (VLCADD) (Scott Schwoerer et al. 2015. PubMed ID: 26937394). However, we have also observed this variant at PreventionGenetics, in the heterozygous state without a second variant identified, in two patients with suspected VLCADD. This variant is reported in 0.0026% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpret as uncertain significance, likely pathogenic and pathogenic in Clinvar (https://www.ncbi.nlm.nih.gov/clinvar/variation/324989/). Although we suspect that this variant may be pathogenic, at this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.83
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.46
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.93	.;D;.
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.97	D;D;D
M_CAP	Pathogenic	0.79	D
MetaRNN	Pathogenic	0.96	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Benign	1.4	.;L;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.64	T
PROVEAN	Uncertain	-3.9	D;.;D
REVEL	Pathogenic	0.98
Sift	Uncertain	0.0010	D;.;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		1.0, 1.0	.;D;D
Vest4		0.97
MutPred		0.78		.;Loss of stability (P = 0.0186);.;
MVP		0.98
MPC		0.67
ClinPred		0.97	D
GERP RS		5.4
Varity_R		0.97
gMVP		0.82

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.34		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.34		Position offset: 1

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

Publications

LitVar

Other links and lift over

dbSNP: rs749159573; hg19: chr17-7125399;