rs34532796

chr2-151662200-A-G

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001164507.2(NEB):c.5905T>C(p.Tyr1969His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00102 in 1,613,652 control chromosomes in the GnomAD database, including 22 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 nucleotide change resulting in same amino acid change has been previously reported as Likely benignin UniProt.

• Frequency:
  • Genomes: 𝑓 0.0051 (11 hom., cov: 32)
  • Exomes 𝑓: 0.00059 (11 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:7
• Conservation: PhyloP100: 9.31

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 Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.009440988).
• BP6: Variant 2-151662200-A-G is Benign according to our data. Variant chr2-151662200-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 211590.We mark this variant Likely_benign, oryginal submissions are: {Uncertain_significance=1, Benign=5, Likely_benign=1}.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00509 (775/152280) while in subpopulation AFR AF= 0.0178 (741/41562). AF 95% confidence interval is 0.0168. There are 11 homozygotes in gnomad4. There are 348 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd at 11 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NEB	NM_001164507.2	c.5905T>C	p.Tyr1969His	missense_variant	46/182	ENST00000427231.7
NEB	NM_001164508.2	c.5905T>C	p.Tyr1969His	missense_variant	46/182	ENST00000397345.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NEB	ENST00000397345.8	c.5905T>C	p.Tyr1969His	missense_variant	46/182	5	NM_001164508.2	P5
NEB	ENST00000427231.7	c.5905T>C	p.Tyr1969His	missense_variant	46/182	5	NM_001164507.2	A2
NEB	ENST00000409198.5	c.5905T>C	p.Tyr1969His	missense_variant	46/150	5

Frequencies

GnomAD3 genomes AF: 0.00509 AC: 775 AN: 152162 Hom.: 11 Cov.: 32

Gnomad AFR AF: 0.0179

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00111

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0127

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.00526

GnomAD3 exomes AF: 0.00150 AC: 374 AN: 248980 Hom.: 2 AF XY: 0.00113 AC XY: 152 AN XY: 135060

Gnomad AFR exome AF: 0.0204

Gnomad AMR exome AF: 0.00131

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000709

Gnomad OTH exome AF: 0.000828

GnomAD4 exome AF: 0.000591 AC: 863 AN: 1461372 Hom.: 11 Cov.: 31 AF XY: 0.000499 AC XY: 363 AN XY: 726970

Gnomad4 AFR exome AF: 0.0206

Gnomad4 AMR exome AF: 0.00134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000696

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000252

Gnomad4 OTH exome AF: 0.00103

GnomAD4 genome AF: 0.00509 AC: 775 AN: 152280 Hom.: 11 Cov.: 32 AF XY: 0.00467 AC XY: 348 AN XY: 74460

Gnomad4 AFR AF: 0.0178

Gnomad4 AMR AF: 0.00111

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.00520

Alfa AF: 0.00110 Hom.: 4

Bravo AF: 0.00582

ESP6500AA AF: 0.0196 AC: 75

ESP6500EA AF: 0.00 AC: 0

ExAC AF: 0.00189 AC: 228

Asia WGS AF: 0.00115 AC: 4 AN: 3478

EpiCase AF: 0.0000546

EpiControl AF: 0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:7

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not specified Uncertain:1 Benign:3

Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Mar 20, 2023	Variant summary: NEB c.5905T>C (p.Tyr1969His) results in a conservative amino acid change in the encoded protein sequence. Two of four in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.0015 in 248980 control chromosomes, predominantly at a frequency of 0.02 within the African or African-American subpopulation in the gnomAD database, including 2 homozygotes. The observed variant frequency within African or African-American control individuals in the gnomAD database is approximately 6 fold of the estimated maximal expected allele frequency for a pathogenic variant in NEB causing Nemaline Myopathy 2 phenotype (0.0035), strongly suggesting that the variant is a benign polymorphism found primarily in populations of African or African-American origin. To our knowledge, no occurrence of c.5905T>C in individuals affected with Nemaline Myopathy 2 and no experimental evidence demonstrating its impact on protein function have been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 and all classified the variant as benign (n=4)/likely benign (n=1). Based on the evidence outlined above, the variant was classified as benign. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Sep 04, 2014	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Oct 06, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Nemaline myopathy 2 Benign:4

Benign, no assertion criteria provided	clinical testing	Natera, Inc.	Nov 11, 2019	- -
Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 31, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Pars Genome Lab	May 18, 2021	- -
Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.51
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.38
Cadd	Uncertain	23
Dann	Uncertain	1.0
Eigen	Uncertain	0.58
Eigen_PC	Uncertain	0.66
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D;D;D;D;D;.;.
MetaRNN	Benign	0.0094	T;T;T;T;T;T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.4	L;L;.;L;L;L;L
MutationTaster	Benign	0.68	D;D;D;D
PrimateAI	Uncertain	0.74	T
PROVEAN	Uncertain	-2.4	N;D;.;D;N;.;.
REVEL	Uncertain	0.29
Sift	Pathogenic	0.0	D;D;.;D;D;.;.
Sift4G	Pathogenic	0.0	D;D;D;D;D;D;D
Polyphen		0.99	.;.;.;.;D;.;.
Vest4		0.58
MVP		0.39
MPC		0.38
ClinPred		0.032	T
GERP RS		5.9
Varity_R		0.51
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: rs34532796; hg19: chr2-152518714; COSMIC: COSV51148883;