NM_016938.5:c.1183G>T

Variant names:

• chr11-65867067-C-A
• NM_016938.5:c.1183G>T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_016938.5(EFEMP2):​c.1183G>T​(p.Val395Phe) variant causes a missense 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. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: EFEMP2 NM_016938.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 0.591

Genes affected

EFEMP2 (HGNC:3219): (EGF containing fibulin extracellular matrix protein 2) A large number of extracellular matrix proteins have been found to contain variations of the epidermal growth factor (EGF) domain and have been implicated in functions as diverse as blood coagulation, activation of complement and determination of cell fate during development. The protein encoded by this gene contains four EGF2 domains and six calcium-binding EGF2 domains. This gene is necessary for elastic fiber formation and connective tissue development. Defects in this gene are cause of an autosomal recessive cutis laxa syndrome. Alternatively spliced transcript variants have been identified for this gene. [provided by RefSeq, Jan 2011]

MUS81 (HGNC:29814): (MUS81 structure-specific endonuclease subunit) This gene encodes a structure-specific endonuclease which belongs to the XPF/MUS81 endonuclease family and plays a critical role in the resolution of recombination intermediates during DNA repair after inter-strand cross-links, replication fork collapse, and DNA double-strand breaks. The encoded protein associates with one of two closely related essential meiotic endonuclease proteins (EME1 or EME2) to form a complex that processes DNA secondary structures. It contains an N-terminal DEAH helicase domain, an excision repair cross complementation group 4 (ERCC4) endonuclease domain, and two tandem C-terminal helix-hairpin-helix domains. Mice with a homozygous knockout of the orthologous gene have significant meiotic defects including the failure to repair a subset of DNA double strand breaks. [provided by RefSeq, Jun 2017]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.4073847).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EFEMP2	NM_016938.5	c.1183G>T	p.Val395Phe	missense_variant	Exon 11 of 11	ENST00000307998.11	NP_058634.4
EFEMP2	NR_037718.2	n.1308G>T		non_coding_transcript_exon_variant	Exon 11 of 12
MUS81	NR_146598.2	n.1813-190C>A		intron_variant	Intron 15 of 15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EFEMP2	ENST00000307998.11	c.1183G>T	p.Val395Phe	missense_variant	Exon 11 of 11	1	NM_016938.5	ENSP00000309953.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cutis laxa, autosomal recessive, type 1B Uncertain:1

Oct 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces valine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 395 of the EFEMP2 protein (p.Val395Phe). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with EFEMP2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1742839). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt EFEMP2 protein function with a negative predictive value of 95%. 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. -

Cardiovascular phenotype Uncertain:1

Feb 11, 2021

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.V395F variant (also known as c.1183G>T), located in coding exon 10 of the EFEMP2 gene, results from a G to T substitution at nucleotide position 1183. The valine at codon 395 is replaced by phenylalanine, an amino acid with highly similar properties. This amino acid position is not well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.092	D
BayesDel_noAF	Benign	-0.11
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.16	.;T;.
Eigen	Benign	0.078
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.92	D;D;D
M_CAP	Benign	0.054	D
MetaRNN	Benign	0.41	T;T;T
MetaSVM	Benign	-0.58	T
MutationAssessor	Benign	0.81	.;L;.
PrimateAI	Uncertain	0.69	T
PROVEAN	Uncertain	-2.9	D;N;D
REVEL	Uncertain	0.42
Sift	Uncertain	0.0020	D;D;D
Sift4G	Uncertain	0.011	D;T;.
Polyphen		0.87	.;P;.
Vest4		0.46
MutPred		0.54		.;Gain of sheet (P = 0.0477);.;
MVP		0.85
MPC		0.50
ClinPred		0.88	D
GERP RS		4.5
Varity_R		0.24
gMVP		0.41

Splicing

Name	Calibrated prediction	Score	Prediction
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr11-65634538;