1-77917624-G-T

Variant names:

• chr1-77917624-G-T
• rs876657931
• NM_144573.4:c.86G>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_144573.4(NEXN):​c.86G>T​(p.Gly29Val) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,368 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. G29A) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NEXN NM_144573.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.37

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NEXN	NM_144573.4	c.86G>T	p.Gly29Val	missense_variant	Exon 3 of 13	ENST00000334785.12	NP_653174.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NEXN	ENST00000334785.12	c.86G>T	p.Gly29Val	missense_variant	Exon 3 of 13	1	NM_144573.4	ENSP00000333938.7
NEXN	ENST00000401035.7	c.28-336G>T		intron_variant	Intron 2 of 8	1		ENSP00000383814.3
NEXN	ENST00000440324.5	c.86G>T	p.Gly29Val	missense_variant	Exon 3 of 10	5		ENSP00000411902.1
NEXN	ENST00000330010.12	c.28-336G>T		intron_variant	Intron 2 of 11	2		ENSP00000327363.8

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461368 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 726990

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000116

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Jan 19, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Gly29Val variant in NEXN has not been previously reported in individuals w ith cardiomyopathy or in large population studies. Computational prediction tool s and conservation analysis suggest that this variant may impact the protein, th ough this information is not predictive enough to determine pathogenicity. In su mmary, the clinical significance of the p.Gly29Val variant is uncertain. -

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

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.60
BayesDel_addAF	Pathogenic	0.23	D
BayesDel_noAF	Uncertain	0.10
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.041	T;T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.78
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.071	D
MetaRNN	Uncertain	0.48	T;T
MetaSVM	Uncertain	-0.072	T
MutationAssessor	Pathogenic	3.0	M;.
PrimateAI	Uncertain	0.74	T
PROVEAN	Benign	-1.9	N;N
REVEL	Benign	0.28
Sift	Uncertain	0.0010	D;D
Sift4G	Benign	0.098	T;T
Polyphen		1.0	D;.
Vest4		0.62
MutPred		0.12		Loss of relative solvent accessibility (P = 0.0404);Loss of relative solvent accessibility (P = 0.0404);
MVP		0.79
MPC		0.34
ClinPred		0.96	D
GERP RS		5.5
Varity_R		0.52
gMVP		0.26

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs876657931; hg19: chr1-78383309;