chr1-77929353-T-C

Variant names:

• chr1-77929353-T-C
• rs373878384
• NM_144573.4:c.902T>C

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_144573.4(NEXN):​c.902T>C​(p.Ile301Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,424 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. I301N) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NEXN NM_144573.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0150
• Publications: 0 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: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.05396974).

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.902T>C	p.Ile301Thr	missense	Exon 9 of 13	NP_653174.3
	NEXN	NM_001172309.2		c.710T>C	p.Ile237Thr	missense	Exon 8 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.902T>C	p.Ile301Thr	missense	Exon 9 of 13	ENSP00000333938.7
	NEXN	ENST00000342754.5	TSL:1	c.599T>C	p.Ile200Thr	missense	Exon 5 of 10	ENSP00000343928.5
	NEXN	ENST00000401035.7	TSL:1	c.710T>C	p.Ile237Thr	missense	Exon 8 of 9	ENSP00000383814.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461424 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727004

African (AFR) AF: 0.00 AC: 0 AN: 33440

American (AMR) AF: 0.00 AC: 0 AN: 44678

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26122

East Asian (EAS) AF: 0.00 AC: 0 AN: 39636

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86182

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53412

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111836

Other (OTH) AF: 0.00 AC: 0 AN: 60364

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.094
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.45
CADD	Benign	0.069
DANN	Benign	0.39
DEOGEN2	Benign	0.0070	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.027	N
LIST_S2	Benign	0.42	T
M_CAP	Benign	0.0076	T
MetaRNN	Benign	0.054	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.57	N
PhyloP100		-0.015
PrimateAI	Benign	0.39	T
PROVEAN	Benign	0.70	N
REVEL	Benign	0.15
Sift	Benign	0.41	T
Sift4G	Benign	0.77	T
Polyphen		0.0	B
Vest4		0.13
MutPred		0.25		Loss of stability (P = 0.0125)
MVP		0.31
MPC		0.055
ClinPred		0.033	T
GERP RS		-1.0
Varity_R		0.077
gMVP		0.023
Mutation Taster		=95/5	polymorphism

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: rs373878384; hg19: chr1-78395038;