2-151540718-G-C

Variant names:

• chr2-151540718-G-C
• rs34555492
• NM_001164507.2:c.20766C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001164507.2(NEB):​c.20766C>G​(p.Asp6922Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D6922V) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NEB NM_001164507.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.22
• Publications: 0 publications found

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]

NEB Gene-Disease associations (from GenCC):

• nemaline myopathy 2

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, LIMITED Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Myriad Women’s Health, G2P, Ambry Genetics
• childhood-onset nemaline myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• intermediate nemaline myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• typical nemaline myopathy

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• lethal multiple pterygium syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• severe congenital nemaline myopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

LOC124906081 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.027092516).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NEB	NM_001164507.2	c.20766C>G	p.Asp6922Glu	missense_variant	Exon 137 of 182	ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2	c.20766C>G	p.Asp6922Glu	missense_variant	Exon 137 of 182	ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NEB	ENST00000397345.8	c.20766C>G	p.Asp6922Glu	missense_variant	Exon 137 of 182	5	NM_001164508.2	ENSP00000380505.3
NEB	ENST00000427231.7	c.20766C>G	p.Asp6922Glu	missense_variant	Exon 137 of 182	5	NM_001164507.2	ENSP00000416578.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Sep 11, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.15663C>G (p.D5221E) alteration is located in exon 110 (coding exon 108) of the NEB gene. This alteration results from a C to G substitution at nucleotide position 15663, causing the aspartic acid (D) at amino acid position 5221 to be replaced by a glutamic acid (E). 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	0.12
BayesDel_addAF	Benign	-0.20	T
BayesDel_noAF	Benign	-0.53
CADD	Benign	0.0030
DANN	Benign	0.44
DEOGEN2	Benign	0.017	.;.;T;.;T;T;.;.;.
Eigen	Benign	-1.5
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.051	N
LIST_S2	Benign	0.69	T;T;T;T;T;T;.;.;T
M_CAP	Benign	0.019	T
MetaRNN	Benign	0.027	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.78	T
MutationAssessor	Benign	-0.20	N;.;.;.;N;.;.;.;.
PhyloP100		-2.2
PrimateAI	Benign	0.39	T
PROVEAN	Benign	-0.63	N;N;.;N;N;N;.;.;N
REVEL	Benign	0.093
Sift	Benign	0.50	T;T;.;T;T;T;.;.;T
Sift4G	Benign	0.25	T;T;T;T;T;T;T;T;.
Polyphen		0.035	.;.;.;.;B;.;.;.;.
Vest4		0.086
MutPred		0.27		Gain of methylation at K5223 (P = 0.0758);.;.;.;Gain of methylation at K5223 (P = 0.0758);.;.;.;.;
MVP		0.18
MPC		0.052
ClinPred		0.18	T
GERP RS		-7.5
Varity_R		0.037
gMVP		0.057
Mutation Taster		=93/7	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs34555492; hg19: chr2-152397232;