2-151662337-T-C

Position:

• chr2-151662337-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001164507.2(NEB):​c.5768A>G​(p.Gln1923Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000214 in 1,398,692 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000021 (0 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 1.25

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3713116).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEB	NM_001164507.2	c.5768A>G	p.Gln1923Arg	missense_variant	46/182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.5768A>G	p.Gln1923Arg	missense_variant	46/182	ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.5768A>G	p.Gln1923Arg	missense_variant	46/182	5	NM_001164508.2	ENSP00000380505	P5
NEB	ENST00000427231.7	c.5768A>G	p.Gln1923Arg	missense_variant	46/182	5	NM_001164507.2	ENSP00000416578	A2
NEB	ENST00000409198.5	c.5768A>G	p.Gln1923Arg	missense_variant	46/150	5		ENSP00000386259

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000937 AC: 2 AN: 213558 Hom.: 0 AF XY: 0.0000172 AC XY: 2 AN XY: 116532

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000195

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000214 AC: 30 AN: 1398692 Hom.: 0 Cov.: 31 AF XY: 0.0000261 AC XY: 18 AN XY: 690148

Gnomad4 AFR exome AF: 0.0000316

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: 0.0000260

Gnomad4 OTH exome AF: 0.0000174

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000828 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Nemaline myopathy 2 Uncertain:2

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 11, 2019	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 06, 2022	This sequence change replaces glutamine, which is neutral and polar, with arginine, which is basic and polar, at codon 1923 of the NEB protein (p.Gln1923Arg). 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 variant has not been reported in the literature in individuals affected with NEB-related conditions. ClinVar contains an entry for this variant (Variation ID: 571309). 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	0.092
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.50
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.030	.;.;T;.;T;.;.
Eigen	Uncertain	0.32
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.78	T;D;D;D;T;.;.
M_CAP	Benign	0.0068	T
MetaRNN	Benign	0.37	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.3	L;L;.;L;L;L;L
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-1.8	N;N;.;N;N;.;.
REVEL	Benign	0.093
Sift	Benign	0.57	T;T;.;T;T;.;.
Sift4G	Benign	0.54	T;T;T;T;T;T;T
Polyphen		0.89	.;.;.;.;P;.;.
Vest4		0.49
MutPred		0.46		Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);Gain of MoRF binding (P = 0.0756);
MVP		0.57
MPC		0.068
ClinPred		0.45	T
GERP RS		5.9
Varity_R		0.18
gMVP		0.49

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: rs755003638; hg19: chr2-152518851;