rs886038214

chr17-7224321-G-A

Variant summary

Our verdict is Benign. Variant got -11 ACMG points: 2P and 13B. PM2 BP4_Strong BP6_Very_Strong BP7

The NM_000018.4(ACADVL):c.1533G>A(p.Arg511=) variant causes a splice region, synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely benign (★★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ACADVL NM_000018.4 splice_region, synonymous
• Scores: Splicing: ADA: 0.004835
• Clinical Significance: Likely benign reviewed by expert panel U:1 B:2
• Conservation: PhyloP100: 1.45

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 Benign. Variant got -11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.56).
• BP6: Variant 17-7224321-G-A is Benign according to our data. Variant chr17-7224321-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 254695.Status of the report is reviewed_by_expert_panel, 3 stars.
• BP7: Synonymous conserved (PhyloP=1.45 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ACADVL	NM_000018.4	c.1533G>A	p.Arg511=	splice_region_variant, synonymous_variant	16/20	ENST00000356839.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ACADVL	ENST00000356839.10	c.1533G>A	p.Arg511=	splice_region_variant, synonymous_variant	16/20	1	NM_000018.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely benign

Submissions summary: Uncertain:1 Benign:2

Revision: reviewed by expert panel

Submissions by phenotype

Very long chain acyl-CoA dehydrogenase deficiency Uncertain:1 Benign:1

Likely benign, reviewed by expert panel	curation	ClinGen ACADVL Variant Curation Expert Panel, ClinGen	Dec 14, 2022	The c.1533G>A (p.Arg511=) variant is a synonymous (silent) variant that is not predicted by (SpliceAI, MaxEntScn, NNSplice) to impact splicing. In addition, it occurs at a nucleotide that is not conserved as shown by the 100 vertebrate Basewise Conservation by PhyloP track in the UCSC genome browser (BP4, BP7). This variant is absent from gnomAD v2.1.1; however, this is not considered conflicting evidence with BP4 and BP7. In summary, this variant meets the criteria to be classified as likely benign for autosomal recessive very long chain acyl-CoA dehydrogenase (VLCAD) deficiency based on the ACMG/AMP criteria applied, as specified by the ClinGen ACADVL Variant Curation Expert Panel: BP4, BP7 (ACADVL VCEP specifications version 1; approved November 8, 2021) -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Jun 27, 2022	ClinVar contains an entry for this variant (Variation ID: 254695). 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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. This variant has not been reported in the literature in individuals affected with ACADVL-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change affects codon 511 of the ACADVL mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the ACADVL protein. It affects a nucleotide within the consensus splice site. -

not specified Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.56
Cadd	Benign	15
Dann	Benign	0.77
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.0048
dbscSNV1_RF	Benign	0.20
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: rs886038214; hg19: chr17-7127640;