2-151485774-C-T

Position:

• chr2-151485774-C-T

Variant summary

Our verdict is Benign. Variant got -7 ACMG points: 2P and 9B. PM2 BP4_Strong BP6 BS1

The NM_001164507.2(NEB):​c.25564G>A​(p.Val8522Ile) variant causes a missense change. The variant allele was found at a frequency of 0.00015 in 1,610,634 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V8522A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.00014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00015 (1 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2 B:3
• Conservation: PhyloP100: 4.98

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]

RIF1 (HGNC:23207): (replication timing regulatory factor 1) This gene encodes a protein that shares homology with the yeast teleomere binding protein, Rap1 interacting factor 1. This protein localizes to aberrant telomeres may be involved in DNA repair. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Apr 2010]

ACMG classification

Verdict is Benign. Variant got -7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.011586517).
• BP6: Variant 2-151485774-C-T is Benign according to our data. Variant chr2-151485774-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 331400.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000138 (21/152300) while in subpopulation EAS AF= 0.00347 (18/5188). AF 95% confidence interval is 0.00224. There are 0 homozygotes in gnomad4. There are 6 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NEB	NM_001164507.2	c.25564G>A	p.Val8522Ile	missense_variant	182/182	ENST00000427231.7
NEB	NM_001164508.2	c.25564G>A	p.Val8522Ile	missense_variant	182/182	ENST00000397345.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NEB	ENST00000397345.8	c.25564G>A	p.Val8522Ile	missense_variant	182/182	5	NM_001164508.2	P5
NEB	ENST00000427231.7	c.25564G>A	p.Val8522Ile	missense_variant	182/182	5	NM_001164507.2	A2

Frequencies

GnomAD3 genomes AF: 0.000138 AC: 21 AN: 152182 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000654

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00346

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000444 AC: 110 AN: 247492 Hom.: 0 AF XY: 0.000418 AC XY: 56 AN XY: 134108

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00535

Gnomad SAS exome AF: 0.000362

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000893

Gnomad OTH exome AF: 0.000333

GnomAD4 exome AF: 0.000152 AC: 221 AN: 1458334 Hom.: 1 Cov.: 31 AF XY: 0.000160 AC XY: 116 AN XY: 724762

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00434

Gnomad4 SAS exome AF: 0.000395

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000721

Gnomad4 OTH exome AF: 0.000116

GnomAD4 genome AF: 0.000138 AC: 21 AN: 152300 Hom.: 0 Cov.: 32 AF XY: 0.0000806 AC XY: 6 AN XY: 74480

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000653

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00347

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000298 Hom.: 1

Bravo AF: 0.000121

ExAC AF: 0.000339 AC: 41

Asia WGS AF: 0.00144 AC: 5 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2 Benign:3

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Nemaline myopathy 2 Uncertain:2 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 17, 2020	- -
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. -

NEB-related disorder Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Sep 30, 2020

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

not provided Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Aug 19, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.13
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.022	.;.;T;.;T;T;.;.
Eigen	Uncertain	0.43
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.87	D;D;D;D;D;D;.;.
M_CAP	Benign	0.029	D
MetaRNN	Benign	0.012	T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.38	T
MutationAssessor	Uncertain	2.1	M;.;.;.;M;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D
PrimateAI	Uncertain	0.61	T
PROVEAN	Benign	-0.64	N;N;.;N;N;N;.;.
REVEL	Benign	0.17
Sift	Pathogenic	0.0	D;D;.;D;D;D;.;.
Sift4G	Benign	0.079	T;T;T;T;T;T;T;T
Polyphen		0.013	.;.;.;.;B;.;.;.
Vest4		0.45
MVP		0.59
MPC		0.26
ClinPred		0.15	T
GERP RS		5.5
Varity_R		0.32
gMVP		0.38

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: rs117861109; hg19: chr2-152342288;