2-151650298-G-C

Position:

• chr2-151650298-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM2 PM5 BP4 BP6

The NM_001164507.2(NEB):​c.7309C>G​(p.Arg2437Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,680 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict 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. R2437W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 2.17

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-151650297-C-T is described in Lovd as [Likely_pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.27572435).
• BP6: Variant 2-151650298-G-C is Benign according to our data. Variant chr2-151650298-G-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 2434162.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NEB	NM_001164507.2	c.7309C>G	p.Arg2437Gly	missense_variant	54/182	ENST00000427231.7
NEB	NM_001164508.2	c.7309C>G	p.Arg2437Gly	missense_variant	54/182	ENST00000397345.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NEB	ENST00000397345.8	c.7309C>G	p.Arg2437Gly	missense_variant	54/182	5	NM_001164508.2	P5
NEB	ENST00000427231.7	c.7309C>G	p.Arg2437Gly	missense_variant	54/182	5	NM_001164507.2	A2
NEB	ENST00000409198.5	c.7309C>G	p.Arg2437Gly	missense_variant	54/150	5

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 152074 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461606 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727092

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152074 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74286

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Dec 03, 2019

- -

Nemaline myopathy 2 Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 22, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Benign	-0.15	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	19
DANN	Uncertain	1.0
DEOGEN2	Benign	0.091	.;.;T;.;T;.;.
Eigen	Benign	-0.11
Eigen_PC	Benign	-0.060
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Uncertain	0.87	D;D;D;D;D;.;.
M_CAP	Benign	0.037	D
MetaRNN	Benign	0.28	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L;L;.;L;L;L;L
MutationTaster	Benign	0.78	N;N;N;N
PrimateAI	Benign	0.41	T
PROVEAN	Uncertain	-2.5	N;D;.;D;N;.;.
REVEL	Benign	0.083
Sift	Uncertain	0.017	D;D;.;D;D;.;.
Sift4G	Uncertain	0.0040	D;D;D;D;D;D;D
Polyphen		0.47	.;.;.;.;P;.;.
Vest4		0.53
MutPred		0.33		Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);Loss of MoRF binding (P = 0.0723);
MVP		0.41
MPC		0.27
ClinPred		0.95	D
GERP RS		0.62
Varity_R		0.21
gMVP		0.58

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: rs375164626; hg19: chr2-152506812;