2-151541475-G-A

Position:

• chr2-151541475-G-A

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 0P and 3B. BP4_Moderate BS2_Supporting

The NM_001164507.2(NEB):​c.20654C>T​(p.Ala6885Val) variant causes a missense change. The variant allele was found at a frequency of 0.000985 in 1,612,980 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00054 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0010 (4 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8 B:1
• Conservation: PhyloP100: 4.53

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]

LOC124906081 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -3 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.15072653).
• BS2: High Homozygotes in GnomAdExome4 at 4 AR geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEB	NM_001164507.2	c.20654C>T	p.Ala6885Val	missense_variant	136/182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.20654C>T	p.Ala6885Val	missense_variant	136/182	ENST00000397345.8	NP_001157980.2
LOC124906081	XR_007087266.1	n.3700G>A		non_coding_transcript_exon_variant	2/3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.20654C>T	p.Ala6885Val	missense_variant	136/182	5	NM_001164508.2	ENSP00000380505	P5
NEB	ENST00000427231.7	c.20654C>T	p.Ala6885Val	missense_variant	136/182	5	NM_001164507.2	ENSP00000416578	A2

Frequencies

GnomAD3 genomes AF: 0.000539 AC: 82 AN: 152136 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000589

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.0000943

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000867

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000427 AC: 106 AN: 248232 Hom.: 0 AF XY: 0.000386 AC XY: 52 AN XY: 134646

Gnomad AFR exome AF: 0.000259

Gnomad AMR exome AF: 0.000407

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.0000465

Gnomad NFE exome AF: 0.000774

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00103 AC: 1506 AN: 1460844 Hom.: 4 Cov.: 30 AF XY: 0.00101 AC XY: 737 AN XY: 726678

Gnomad4 AFR exome AF: 0.000150

Gnomad4 AMR exome AF: 0.000425

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000375

Gnomad4 NFE exome AF: 0.00129

Gnomad4 OTH exome AF: 0.000713

GnomAD4 genome AF: 0.000539 AC: 82 AN: 152136 Hom.: 0 Cov.: 32 AF XY: 0.000404 AC XY: 30 AN XY: 74314

Gnomad4 AFR AF: 0.000241

Gnomad4 AMR AF: 0.000589

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.0000943

Gnomad4 NFE AF: 0.000867

Gnomad4 OTH AF: 0.00143

Alfa AF: 0.000859 Hom.: 0

Bravo AF: 0.000623

TwinsUK AF: 0.00189 AC: 7

ALSPAC AF: 0.00182 AC: 7

ESP6500AA AF: 0.000504 AC: 2

ESP6500EA AF: 0.000840 AC: 7

ExAC AF: 0.000347 AC: 42

EpiCase AF: 0.000601

EpiControl AF: 0.000833

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:8 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Nemaline myopathy 2 Uncertain:3 Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 02, 2019	This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868]. -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 24, 2024	- -

not provided Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Jun 22, 2015	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	May 25, 2023	In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Nov 23, 2022	- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 16, 2021

The c.15551C>T (p.A5184V) alteration is located in exon 109 (coding exon 107) of the NEB gene. This alteration results from a C to T substitution at nucleotide position 15551, causing the alanine (A) at amino acid position 5184 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Sep 09, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.41
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.25
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.035	.;.;T;.;T;T;.;.
Eigen	Uncertain	0.66
Eigen_PC	Pathogenic	0.66
FATHMM_MKL	Pathogenic	0.97	D
LIST_S2	Benign	0.81	T;T;T;T;T;D;.;.
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.15	T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.2	T
MutationAssessor	Benign	1.3	L;.;.;.;L;.;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-1.7	N;N;.;N;N;N;.;.
REVEL	Benign	0.18
Sift	Uncertain	0.0080	D;D;.;D;D;D;.;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;.;.;D;.;.;.
Vest4		0.71
MVP		0.41
MPC		0.34
ClinPred		0.099	T
GERP RS		5.6
Varity_R		0.35
gMVP		0.36

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs202209668; hg19: chr2-152397989;