rs557160401

Positions:

• chr15-76311369-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2 BP4_Strong BS1_Supporting

The ENST00000557943.6(ETFA):​c.20C>T​(p.Pro7Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000411 in 1,562,322 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P7P) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00026 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00043 (0 hom.)
• Consequence: ETFA ENST00000557943.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:5
• Conservation: PhyloP100: 0.842

Genes affected

ETFA (HGNC:3481): (electron transfer flavoprotein subunit alpha) ETFA participates in catalyzing the initial step of the mitochondrial fatty acid beta-oxidation. It shuttles electrons between primary flavoprotein dehydrogenases and the membrane-bound electron transfer flavoprotein ubiquinone oxidoreductase. Defects in electron-transfer-flavoprotein have been implicated in type II glutaricaciduria in which multiple acyl-CoA dehydrogenase deficiencies result in large excretion of glutaric, lactic, ethylmalonic, butyric, isobutyric, 2-methyl-butyric, and isovaleric acids. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.005465746).
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000263 (40/152360) while in subpopulation NFE AF= 0.000544 (37/68038). AF 95% confidence interval is 0.000405. There are 0 homozygotes in gnomad4. There are 18 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ETFA	NM_000126.4	c.20C>T	p.Pro7Leu	missense_variant	1/12	ENST00000557943.6	NP_000117.1
ETFA	NM_001127716.2	c.20C>T	p.Pro7Leu	missense_variant	1/11		NP_001121188.1
ETFA	XR_007064434.1	n.101C>T		non_coding_transcript_exon_variant	1/12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ETFA	ENST00000557943.6	c.20C>T	p.Pro7Leu	missense_variant	1/12	1	NM_000126.4	ENSP00000452762	P1

Frequencies

GnomAD3 genomes AF: 0.000263 AC: 40 AN: 152242 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000723

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000544

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000187 AC: 30 AN: 160244 Hom.: 0 AF XY: 0.000207 AC XY: 18 AN XY: 87052

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: 0.000134

Gnomad NFE exome AF: 0.000421

Gnomad OTH exome AF: 0.000448

GnomAD4 exome AF: 0.000427 AC: 602 AN: 1409962 Hom.: 0 Cov.: 32 AF XY: 0.000431 AC XY: 300 AN XY: 696648

Gnomad4 AFR exome AF: 0.000124

Gnomad4 AMR exome AF: 0.0000534

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000837

Gnomad4 NFE exome AF: 0.000529

Gnomad4 OTH exome AF: 0.000291

GnomAD4 genome AF: 0.000263 AC: 40 AN: 152360 Hom.: 0 Cov.: 33 AF XY: 0.000242 AC XY: 18 AN XY: 74508

Gnomad4 AFR AF: 0.0000721

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000544

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000286 Hom.: 0

Bravo AF: 0.000264

ExAC AF: 0.000106 AC: 12

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Multiple acyl-CoA dehydrogenase deficiency Uncertain:3

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 24, 2022	This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 7 of the ETFA protein (p.Pro7Leu). This variant is present in population databases (rs557160401, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with ETFA-related conditions. ClinVar contains an entry for this variant (Variation ID: 203689). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. 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. -
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. -

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Aug 01, 2022	ETFA: PM2 -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.092	T;.;.;T;T
Eigen	Benign	-0.89
Eigen_PC	Benign	-0.88
FATHMM_MKL	Benign	0.25	N
LIST_S2	Benign	0.78	T;T;T;T;T
MetaRNN	Benign	0.0055	T;T;T;T;T
MetaSVM	Benign	-0.55	T
MutationAssessor	Benign	-0.69	N;N;.;.;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	0.65	N;N;N;N;N
REVEL	Benign	0.15
Sift	Uncertain	0.0070	D;D;D;D;D
Sift4G	Benign	0.11	T;T;D;T;.
Polyphen		0.0	B;.;.;.;.
Vest4		0.29
MVP		0.79
MPC		0.37
ClinPred		0.17	T
GERP RS		2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.2
Varity_R		0.082
gMVP		0.32

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: rs557160401; hg19: chr15-76603710;