1-155133752-C-A

Position:

• chr1-155133752-C-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004428.3(EFNA1):​c.477C>A​(p.Asp159Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,864 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D159V) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: EFNA1 NM_004428.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.21

Genes affected

EFNA1 (HGNC:3221): (ephrin A1) This gene encodes a member of the ephrin (EPH) family. The ephrins and EPH-related receptors comprise the largest subfamily of receptor protein-tyrosine kinases and have been implicated in mediating developmental events, especially in the nervous system and in erythropoiesis. Based on their structures and sequence relationships, ephrins are divided into the ephrin-A (EFNA) class, which are anchored to the membrane by a glycosylphosphatidylinositol linkage, and the ephrin-B (EFNB) class, which are transmembrane proteins. This gene encodes an EFNA class ephrin which binds to the EPHA2, EPHA4, EPHA5, EPHA6, and EPHA7 receptors. Two transcript variants that encode different isoforms were identified through sequence analysis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.061250627).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
EFNA1	NM_004428.3	c.477C>A	p.Asp159Glu	missense_variant	4/5	ENST00000368407.8	NP_004419.2
EFNA1	NM_182685.2	c.411C>A	p.Asp137Glu	missense_variant	3/4		NP_872626.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
EFNA1	ENST00000368407.8	c.477C>A	p.Asp159Glu	missense_variant	4/5	1	NM_004428.3	ENSP00000357392	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461864 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 727230

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000101

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 11, 2022

The c.477C>A (p.D159E) alteration is located in exon 4 (coding exon 4) of the EFNA1 gene. This alteration results from a C to A substitution at nucleotide position 477, causing the aspartic acid (D) at amino acid position 159 to be replaced by a glutamic acid (E). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.072
BayesDel_addAF	Benign	-0.070	T
BayesDel_noAF	Benign	-0.34
CADD	Benign	8.9
DANN	Benign	0.74
DEOGEN2	Benign	0.041	T;.
Eigen	Benign	-0.56
Eigen_PC	Benign	-0.35
FATHMM_MKL	Benign	0.58	D
LIST_S2	Benign	0.53	T;T
M_CAP	Benign	0.023	T
MetaRNN	Benign	0.061	T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	0.34	N;.
MutationTaster	Benign	0.98	N;N
PrimateAI	Benign	0.29	T
PROVEAN	Benign	0.32	N;N
REVEL	Uncertain	0.30
Sift	Benign	1.0	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0060	B;B
Vest4		0.078
MutPred		0.20		Gain of helix (P = 0.0854);.;
MVP		0.58
MPC		0.18
ClinPred		0.15	T
GERP RS		5.6
Varity_R		0.13
gMVP		0.21

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: rs1664299539; hg19: chr1-155106228;