rs200918570

Positions:

• chr2-151526166-C-T

Variant summary

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

The NM_001164508.2(NEB):​c.22042G>A​(p.Val7348Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,616 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: NEB NM_001164508.2 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 5.02

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]

NEB (HGNC:):

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/exons	MANE	Protein	UniProt
NEB	NM_001164507.2	c.22042G>A	p.Val7348Met	missense_variant	149/182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.22042G>A	p.Val7348Met	missense_variant	149/182	ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.22042G>A	p.Val7348Met	missense_variant	149/182	5	NM_001164508.2	ENSP00000380505.3
NEB	ENST00000427231.7	c.22042G>A	p.Val7348Met	missense_variant	149/182	5	NM_001164507.2	ENSP00000416578.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461616 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727078

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 16, 2023

The c.16939G>A (p.V5647M) alteration is located in exon 122 (coding exon 120) of the NEB gene. This alteration results from a G to A substitution at nucleotide position 16939, causing the valine (V) at amino acid position 5647 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Nemaline myopathy 2 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 08, 2021

This sequence change replaces valine with methionine at codon 7383 of the NEB protein (p.Val7383Met). The valine residue is moderately conserved and there is a small physicochemical difference between valine and methionine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals affected with NEB-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). 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	0.33
BayesDel_addAF	Uncertain	0.076	D
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.031	.;.;T;.;T;T;.;.
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.88	D;D;T;D;D;D;.;.
M_CAP	Benign	0.027	D
MetaRNN	Uncertain	0.50	D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.69	T
MutationAssessor	Uncertain	2.0	M;.;.;.;M;.;.;.
PrimateAI	Uncertain	0.62	T
PROVEAN	Benign	-0.98	N;N;.;N;N;N;.;.
REVEL	Benign	0.19
Sift	Benign	0.074	T;T;.;T;T;D;.;.
Sift4G	Uncertain	0.0020	D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;.;.;D;.;.;.
Vest4		0.68
MVP		0.49
MPC		0.34
ClinPred		0.96	D
GERP RS		6.1
Varity_R		0.13
gMVP		0.41

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: rs200918570; hg19: chr2-152382680;