rs371431782

Positions:

• chr1-77917694-C-A
• chr1-77917694-C-T

Variant summary

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

The NM_144573.4(NEXN):​c.156C>A​(p.Asp52Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,459,526 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 (★). Synonymous variant affecting the same amino acid position (i.e. D52D) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: NEXN NM_144573.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.46

Genes affected

NEXN (HGNC:29557): (nexilin F-actin binding protein) This gene encodes a filamentous actin-binding protein that may function in cell adhesion and migration. Mutations in this gene have been associated with dilated cardiomyopathy, also known as CMD1CC. Alternatively spliced transcript variants have been described.[provided by RefSeq, Feb 2010]

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=0.023033708).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEXN	NM_144573.4	c.156C>A	p.Asp52Glu	missense_variant	3/13	ENST00000334785.12	NP_653174.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEXN	ENST00000334785.12	c.156C>A	p.Asp52Glu	missense_variant	3/13	1	NM_144573.4	ENSP00000333938	P3
NEXN	ENST00000401035.7	c.28-266C>A		intron_variant		1		ENSP00000383814
NEXN	ENST00000440324.5	c.156C>A	p.Asp52Glu	missense_variant	3/10	5		ENSP00000411902
NEXN	ENST00000330010.12	c.28-266C>A		intron_variant		2		ENSP00000327363	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000206 AC: 3 AN: 1459526 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 726122

Gnomad4 AFR exome AF: 0.0000300

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000253

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

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

Dilated cardiomyopathy 1CC;C3151267:Hypertrophic cardiomyopathy 20 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 12, 2022

This sequence change replaces aspartic acid, which is acidic and polar, with glutamic acid, which is acidic and polar, at codon 52 of the NEXN protein (p.Asp52Glu). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with NEXN-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glutamic acid amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Benign	-0.26	T
BayesDel_noAF	Benign	-0.61
CADD	Benign	0.010
DANN	Benign	0.69
DEOGEN2	Benign	0.0053	T;T
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.4
FATHMM_MKL	Benign	0.040	N
LIST_S2	Benign	0.62	T;T
M_CAP	Benign	0.0098	T
MetaRNN	Benign	0.023	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.85	N;.
MutationTaster	Benign	1.0	D;N;N;N
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	0.13	N;N
REVEL	Benign	0.070
Sift	Benign	0.71	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0010	B;.
Vest4		0.20
MutPred		0.14		Gain of helix (P = 0.062);Gain of helix (P = 0.062);
MVP		0.23
MPC		0.046
ClinPred		0.041	T
GERP RS		-4.8
Varity_R		0.047
gMVP		0.032

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: rs371431782; hg19: chr1-78383379;