chr1-77933462-A-G

Variant names:

• chr1-77933462-A-G
• rs768693715
• NM_144573.4:c.1234A>G

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_144573.4(NEXN):​c.1234A>G​(p.Arg412Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,458,208 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: NEXN NM_144573.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 4.53
• Publications: 1 publications found

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]

NEXN Gene-Disease associations (from GenCC):

• dilated cardiomyopathy

  Inheritance: AD Classification: MODERATE Submitted by: ClinGen
• familial isolated dilated cardiomyopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• dilated cardiomyopathy 1CC

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• hypertrophic cardiomyopathy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• hypertrophic cardiomyopathy 20

  Inheritance: AD Classification: LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_144573.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NEXN	NM_144573.4	MANE Select	c.1234A>G	p.Arg412Gly	missense	Exon 10 of 13	NP_653174.3
	NEXN	NM_001172309.2		c.1042A>G	p.Arg348Gly	missense	Exon 9 of 12	NP_001165780.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NEXN	ENST00000334785.12	TSL:1 MANE Select	c.1234A>G	p.Arg412Gly	missense	Exon 10 of 13	ENSP00000333938.7
	NEXN	ENST00000342754.5	TSL:1	c.931A>G	p.Arg311Gly	missense	Exon 6 of 10	ENSP00000343928.5
	NEXN	ENST00000330010.12	TSL:2	c.1042A>G	p.Arg348Gly	missense	Exon 9 of 12	ENSP00000327363.8

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD2 exomes AF: 0.00000804 AC: 2 AN: 248654 AF XY: 0.0000148

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1458208 Hom.: 0 Cov.: 30 AF XY: 0.00000551 AC XY: 4 AN XY: 725622

African (AFR) AF: 0.00 AC: 0 AN: 33420

American (AMR) AF: 0.00 AC: 0 AN: 44688

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26096

East Asian (EAS) AF: 0.00 AC: 0 AN: 39630

South Asian (SAS) AF: 0.0000349 AC: 3 AN: 86024

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53384

Middle Eastern (MID) AF: 0.000174 AC: 1 AN: 5758

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1108946

Other (OTH) AF: 0.00 AC: 0 AN: 60262

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ExAC AF: 0.00000828 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

May 16, 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.Arg412Gly variant in NEXN has not been previously reported in individuals with cardiomyopathy, but has been identified in 1/15358 South Asian chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org). Comp utational prediction tools and conservation analysis suggest that the variant ma y impact the protein, though this information is not predictive enough to determ ine pathogenicity. In summary, the clinical significance of the p.Arg412Gly vari ant is uncertain.

Cardiomyopathy Uncertain:1

Sep 08, 2022

CHEO Genetics Diagnostic Laboratory, Children's Hospital of Eastern Ontario

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cardiovascular phenotype Uncertain:1

May 27, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.R412G variant (also known as c.1234A>G), located in coding exon 9 of the NEXN gene, results from an A to G substitution at nucleotide position 1234. The arginine at codon 412 is replaced by glycine, an amino acid with dissimilar properties. This amino acid position is conserved. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.21	T
Eigen	Uncertain	0.39
Eigen_PC	Uncertain	0.42
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	0.97	D
M_CAP	Uncertain	0.10	D
MetaRNN	Uncertain	0.62	D
MetaSVM	Benign	-0.46	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		4.5
PrimateAI	Uncertain	0.73	T
PROVEAN	Uncertain	-2.6	D
REVEL	Uncertain	0.49
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.015	D
Polyphen		1.0	D
Vest4		0.85
MutPred		0.21		Gain of relative solvent accessibility (P = 0.09)
MVP		0.87
MPC		0.35
ClinPred		0.98	D
GERP RS		4.5
Varity_R		0.51
gMVP		0.21
Mutation Taster		=46/54	disease causing

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

Other links and lift over

dbSNP: rs768693715; hg19: chr1-78399147;