NM_001164507.2:c.25183C>T

Variant names:

• chr2-151490486-G-A
• rs747179265
• NM_001164507.2:c.25183C>T

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_001164507.2(NEB):​c.25183C>T​(p.Arg8395*) variant causes a stop gained change. The variant allele was found at a frequency of 0.00000275 in 1,457,018 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: NEB NM_001164507.2 stop_gained
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 4.10
• Publications: 0 publications found

Genes affected

NEB (HGNC:7720): (nebulin) This gene encodes nebulin, a giant protein component of the cytoskeletal matrix that coexists with the thick and thin filaments within the sarcomeres of skeletal muscle. In most vertebrates, nebulin accounts for 3 to 4% of the total myofibrillar protein. The encoded protein contains approximately 30-amino acid long modules that can be classified into 7 types and other repeated modules. Protein isoform sizes vary from 600 to 800 kD due to alternative splicing that is tissue-, species-,and developmental stage-specific. Of the 183 exons in the nebulin gene, at least 43 are alternatively spliced, although exons 143 and 144 are not found in the same transcript. Of the several thousand transcript variants predicted for nebulin, the RefSeq Project has decided to create three representative RefSeq records. Mutations in this gene are associated with recessive nemaline myopathy. [provided by RefSeq, Sep 2009]

RIF1 (HGNC:23207): (replication timing regulatory factor 1) This gene encodes a protein that shares homology with the yeast teleomere binding protein, Rap1 interacting factor 1. This protein localizes to aberrant telomeres may be involved in DNA repair. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Apr 2010]

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 2-151490486-G-A is Pathogenic according to our data. Variant chr2-151490486-G-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 451684.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001164507.2. 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
	NEB	NM_001164507.2	MANE Plus Clinical	c.25183C>T	p.Arg8395*	stop_gained	Exon 180 of 182	NP_001157979.2
	NEB	NM_001164508.2	MANE Select	c.25183C>T	p.Arg8395*	stop_gained	Exon 180 of 182	NP_001157980.2
	NEB	NM_001271208.2		c.25288C>T	p.Arg8430*	stop_gained	Exon 181 of 183	NP_001258137.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	NEB	ENST00000397345.8	TSL:5 MANE Select	c.25183C>T	p.Arg8395*	stop_gained	Exon 180 of 182	ENSP00000380505.3
	NEB	ENST00000427231.7	TSL:5 MANE Plus Clinical	c.25183C>T	p.Arg8395*	stop_gained	Exon 180 of 182	ENSP00000416578.2
	RIF1	ENST00000457745.1	TSL:1	n.480+3730G>A		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000830 AC: 2 AN: 240908 AF XY: 0.00000767

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: 0.00000915

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1457018 Hom.: 0 Cov.: 32 AF XY: 0.00000276 AC XY: 2 AN XY: 724068

African (AFR) AF: 0.00 AC: 0 AN: 33396

American (AMR) AF: 0.00 AC: 0 AN: 44252

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25946

East Asian (EAS) AF: 0.00 AC: 0 AN: 39536

South Asian (SAS) AF: 0.0000236 AC: 2 AN: 84818

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53164

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5758

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1109918

Other (OTH) AF: 0.00 AC: 0 AN: 60230

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Apr 22, 2025

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28087426, 33057194, 35982159, 36964972)

Nov 22, 2022

Revvity Omics, Revvity

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nemaline myopathy 2 Pathogenic:2

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Feb 24, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Arg8430*) in the NEB gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in NEB are known to be pathogenic (PMID: 25205138). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This premature translational stop signal has been observed in individual(s) with NEB-related conditions (PMID: 21520333). ClinVar contains an entry for this variant (Variation ID: 451684). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic.

NEB-related disorder Pathogenic:1

Sep 04, 2022

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NEB c.25288C>T variant is predicted to result in premature protein termination (p.Arg8430*). This variant has been reported in the heterozygous state in an individual with idiopathic ventricular fibrillation (Visser et al. 2017. PubMed ID: 28087426). This variant is reported in 0.0035% of alleles in individuals of South Asian descent in gnomAD (http://gnomad.broadinstitute.org/variant/2-152347000-G-A). Nonsense variants in NEB are expected to be pathogenic. This variant is interpreted as likely pathogenic.

Arthrogryposis multiplex congenita 6 Pathogenic:1

Mar 01, 2024

Baylor Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Nemaline myopathy 2;C5543431:Arthrogryposis multiplex congenita 6 Pathogenic:1

Molecular Genetics Department, Kulakov National Medical Research Center for Obstetrics, Gynecology and Perinatology

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A previously undescribed heterozygous nucleotide variant creates a premature translation stop signal p.Arg8395Ter in the NEB gene (rs747179265). Homozygous and compound heterozygous variants are reported in patients with arthrogryposis multiplex congenita 6, 619334; Nemaline myopathy 2, autosomal recessive, 256030. The variant frequency in population database gnomAD is 0.00025%. The variant is found in trans-position with the NEB variant (NM_001164508.2:c.21751C>T). In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as likely pathogenic.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
CADD	Pathogenic	45
DANN	Uncertain	1.0
Eigen	Uncertain	0.56
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Uncertain	0.96	D
PhyloP100		4.1
Vest4		0.87
GERP RS		3.5
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.10		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: rs747179265; hg19: chr2-152347000;