2-151567427-G-A

Position:

• chr2-151567427-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001164508.2(NEB):​c.17897C>T​(p.Pro5966Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000719 in 1,613,224 control chromosomes in the GnomAD database, including 1 homozygotes. 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 Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00018 (1 hom., cov: 32)
  • Exomes 𝑓: 0.000061 (0 hom.)
• Consequence: NEB NM_001164508.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:6 B:1
• Conservation: PhyloP100: 1.56

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11348805).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEB	NM_001164507.2	c.17897C>T	p.Pro5966Leu	missense_variant	114/182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.17897C>T	p.Pro5966Leu	missense_variant	114/182	ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.17897C>T	p.Pro5966Leu	missense_variant	114/182	5	NM_001164508.2	ENSP00000380505.3
NEB	ENST00000427231.7	c.17897C>T	p.Pro5966Leu	missense_variant	114/182	5	NM_001164507.2	ENSP00000416578.2

Frequencies

GnomAD3 genomes AF: 0.000178 AC: 27 AN: 152004 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.000508

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000656

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000588

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000605 AC: 15 AN: 248088 Hom.: 0 AF XY: 0.0000520 AC XY: 7 AN XY: 134558

Gnomad AFR exome AF: 0.000453

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000655

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000445

Gnomad OTH exome AF: 0.000166

GnomAD4 exome AF: 0.0000609 AC: 89 AN: 1461220 Hom.: 0 Cov.: 31 AF XY: 0.0000550 AC XY: 40 AN XY: 726850

Gnomad4 AFR exome AF: 0.000777

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000504

Gnomad4 OTH exome AF: 0.0000331

GnomAD4 genome AF: 0.000178 AC: 27 AN: 152004 Hom.: 1 Cov.: 32 AF XY: 0.000189 AC XY: 14 AN XY: 74234

Gnomad4 AFR AF: 0.000508

Gnomad4 AMR AF: 0.0000656

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.000290 Hom.: 0

Bravo AF: 0.000230

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000120 AC: 1

ExAC AF: 0.0000662 AC: 8

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:6 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Mar 30, 2023	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Jan 23, 2024	Reported in a patient with congenital myopathy and motor developmental delay in published literature; of note, the NEB variant did not segregate in the affected sibling and both affected patients were found to harbor a pathogenic variant in the RYR1 gene (PMID: 29576327); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 29576327) -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 20, 2017	- -

Nemaline myopathy 2 Uncertain:2 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. -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 17, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 07, 2017

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.36
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Benign	0.059	.;.;T;.;T;T;.;.
Eigen	Benign	0.12
Eigen_PC	Uncertain	0.27
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Benign	0.78	T;D;D;D;T;D;.;.
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.11	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.89	T
MutationAssessor	Benign	0.42	N;.;.;.;N;.;.;.
PrimateAI	Uncertain	0.55	T
PROVEAN	Uncertain	-3.1	D;D;.;D;D;N;.;.
REVEL	Benign	0.089
Sift	Benign	0.34	T;T;.;T;T;T;.;.
Sift4G	Benign	0.37	T;T;T;T;T;T;T;T
Polyphen		0.0020	.;.;.;.;B;.;.;.
Vest4		0.23
MVP		0.68
MPC		0.066
ClinPred		0.062	T
GERP RS		5.9
Varity_R		0.12
gMVP		0.22

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: rs368912483; hg19: chr2-152423941;