chr2-151706876-C-T

Position:

chr2-151706876-C-T

Variant summary

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

The NM_001164508.2(NEB):c.1152+5G>A variant causes a splice region, intron change. The variant allele was found at a frequency of 0.0000929 in 1,582,412 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000094 ( 0 hom. )

Consequence

NEB
NM_001164508.2 splice_region, intron

Scores

Splicing: ADA: 1.000

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 7.14

Variant links:

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 links:

NEB (HGNC:):

NEB links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEB	NM_001164507.2 linkuse as main transcript	c.1152+5G>A		splice_region_variant, intron_variant		ENST00000427231.7	NP_001157979.2
NEB	NM_001164508.2 linkuse as main transcript	c.1152+5G>A		splice_region_variant, intron_variant		ENST00000397345.8	NP_001157980.2

Ensembl

Gene	Transcript	HGVSc	Effect	TSL	MANE	Protein	UniProt
NEB	ENST00000397345.8 linkuse as main transcript	c.1152+5G>A	splice_region_variant, intron_variant	5	NM_001164508.2	ENSP00000380505.3	P20929-2
NEB	ENST00000427231.7 linkuse as main transcript	c.1152+5G>A	splice_region_variant, intron_variant	5	NM_001164507.2	ENSP00000416578.2	P20929-3
NEB	ENST00000489048.1 linkuse as main transcript	n.51+5G>A	splice_region_variant, intron_variant	1
NEB	ENST00000409198.5 linkuse as main transcript	c.1152+5G>A	splice_region_variant, intron_variant	5		ENSP00000386259.1	P20929-4

Frequencies

GnomAD3 genomes

AF:

0.0000788

AC:

AN:

152188

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000132

AC:

AN:

212526

Hom.:

AF XY:

0.000150

AC XY:

AN XY:

113626

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000299

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000944

AC:

135

AN:

1430224

Hom.:

Cov.:

AF XY:

0.000104

AC XY:

AN XY:

708834

show subpopulations

Gnomad4 AFR exome

AF:

0.00

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:

0.0000382

Gnomad4 NFE exome

AF:

0.000120

Gnomad4 OTH exome

AF:

0.0000337

GnomAD4 genome

AF:

0.0000788

AC:

AN:

152188

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74356

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000942

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000889

Hom.:

Bravo

AF:

0.0000491

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Nemaline myopathy 2

Uncertain:4

Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Jan 25, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Oct 17, 2022	This sequence change falls in intron 13 of the NEB gene. It does not directly change the encoded amino acid sequence of the NEB protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs111404077, gnomAD 0.03%). This variant has been observed in individual(s) with unspecified nemaline myopathy (PMID: 25205138). ClinVar contains an entry for this variant (Variation ID: 465438). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Aug 03, 2017	The NEB c.1152+5G>A variant has been reported in one study in which it is found in an unspecified number of individuals in one family with a form of nemaline myopathy in a compound heterozygous state with a stop-gained variant (Lehtokari et al. 2014). Control data are unavailable for this variant, which is reported at a frequency of 0.00066 in the European (non-Finnish) population of the Exome Aggregation Consortium. The evidence for this variant is limited. The c.1152+5G>A variant is therefore classified as a variant of unknown significance but suspicious for pathogenicity for autosomal recessive nemaline myopathy. This variant was observed by ICSL as part of a predisposition screen in an ostensibly healthy population. -

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Aug 12, 2021

Variant summary: NEB c.1152+5G>A alters a conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. Several computational tools predict a significant impact on normal splicing: one predict the variant abolishes a 5 prime splicing donor site; three predict the variant weakens a 5 prime donor site. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 0.00013 in 212526 control chromosomes. This frequency is not significantly higher than expected for a pathogenic variant in NEB causing Nemaline Myopathy 2 (0.00013 vs 0.0035), allowing no conclusion about variant significance. c.1152+5G>A has been reported in the literature in individuals affected with Nemaline Myopathy 2 (Lehtokari_2014). These data do not allow any conclusion about variant significance. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Revvity Omics, Revvity

Jun 28, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.17

CADD

Uncertain

DANN

Uncertain

0.98

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.83

SpliceAI score (max)

0.21

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.21

Position offset: 5

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over