2-151664532-G-A

Position:

• chr2-151664532-G-A

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001164507.2(NEB):​c.5420C>T​(p.Ala1807Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000153 in 1,603,898 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 0.00016 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00015 (0 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:1
• Conservation: PhyloP100: 8.13

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.024225831).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEB	NM_001164507.2	c.5420C>T	p.Ala1807Val	missense_variant	44/182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.5420C>T	p.Ala1807Val	missense_variant	44/182	ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.5420C>T	p.Ala1807Val	missense_variant	44/182	5	NM_001164508.2	ENSP00000380505	P5
NEB	ENST00000427231.7	c.5420C>T	p.Ala1807Val	missense_variant	44/182	5	NM_001164507.2	ENSP00000416578	A2
NEB	ENST00000409198.5	c.5420C>T	p.Ala1807Val	missense_variant	44/150	5		ENSP00000386259

Frequencies

GnomAD3 genomes AF: 0.000158 AC: 24 AN: 152220 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000262

Gnomad ASJ AF: 0.00403

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000269 AC: 63 AN: 234340 Hom.: 0 AF XY: 0.000268 AC XY: 34 AN XY: 126734

Gnomad AFR exome AF: 0.0000703

Gnomad AMR exome AF: 0.0000911

Gnomad ASJ exome AF: 0.00463

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000360

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000113

Gnomad OTH exome AF: 0.000350

GnomAD4 exome AF: 0.000153 AC: 222 AN: 1451560 Hom.: 0 Cov.: 30 AF XY: 0.000161 AC XY: 116 AN XY: 721124

Gnomad4 AFR exome AF: 0.0000304

Gnomad4 AMR exome AF: 0.000162

Gnomad4 ASJ exome AF: 0.00440

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000119

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000614

Gnomad4 OTH exome AF: 0.000467

GnomAD4 genome AF: 0.000158 AC: 24 AN: 152338 Hom.: 0 Cov.: 32 AF XY: 0.000174 AC XY: 13 AN XY: 74504

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.000261

Gnomad4 ASJ AF: 0.00403

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000379 Hom.: 0

Bravo AF: 0.000219

ESP6500AA AF: 0.000264 AC: 1

ESP6500EA AF: 0.000364 AC: 3

ExAC AF: 0.000215 AC: 26

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Apr 19, 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	Mar 29, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Apr 01, 2024	NEB: PM2:Supporting, BP4 -

Nemaline myopathy 2 Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Mar 16, 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. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Oct 12, 2021

The c.5420C>T (p.A1807V) alteration is located in exon 44 (coding exon 42) of the NEB gene. This alteration results from a C to T substitution at nucleotide position 5420, causing the alanine (A) at amino acid position 1807 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.19	T
BayesDel_noAF	Benign	-0.29
CADD	Uncertain	26
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.14	.;.;T;.;T;.;.
Eigen	Pathogenic	0.84
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.87	D;D;D;D;D;.;.
M_CAP	Benign	0.020	T
MetaRNN	Benign	0.024	T;T;T;T;T;T;T
MetaSVM	Benign	-0.75	T
MutationAssessor	Uncertain	2.6	M;M;.;M;M;M;M
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Uncertain	0.50	T
PROVEAN	Benign	-1.9	N;N;.;N;N;.;.
REVEL	Uncertain	0.30
Sift	Benign	0.035	D;T;.;T;D;.;.
Sift4G	Uncertain	0.0030	D;D;D;D;D;D;D
Polyphen		1.0	.;.;.;.;D;.;.
Vest4		0.58
MVP		0.58
MPC		0.23
ClinPred		0.078	T
GERP RS		5.2
Varity_R		0.34
gMVP		0.49

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs373790988; hg19: chr2-152521046;