17-4901932-C-T

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1PM2PM5PP3_Strong

The NM_000080.4(CHRNE):c.500G>A(p.Arg167His) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,256 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R167L) has been classified as Likely pathogenic.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CHRNE
NM_000080.4 missense, splice_region

Scores

Splicing: ADA: 1.000

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.71

Publications

0 publications found

Variant links:

Genes affected

CHRNE (HGNC:1966): (cholinergic receptor nicotinic epsilon subunit) Acetylcholine receptors at mature mammalian neuromuscular junctions are pentameric protein complexes composed of four subunits in the ratio of two alpha subunits to one beta, one epsilon, and one delta subunit. The acetylcholine receptor changes subunit composition shortly after birth when the epsilon subunit replaces the gamma subunit seen in embryonic receptors. Mutations in the epsilon subunit are associated with congenital myasthenic syndrome. [provided by RefSeq, Sep 2009]

CHRNE links:

C17orf107 (HGNC:37238): (chromosome 17 open reading frame 107)

C17orf107 links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 10 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in NM_000080.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr17-4901932-C-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 18345.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNE	NM_000080.4 link	c.500G>A	p.Arg167His	missense_variant, splice_region_variant	Exon 5 of 12	ENST00000649488.2	NP_000071.1	Q04844
C17orf107	NM_001145536.2 link	c.*1399C>T		3_prime_UTR_variant	Exon 3 of 3	ENST00000381365.4	NP_001139008.1	Q6ZR85

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRNE	ENST00000649488.2 link	c.500G>A	p.Arg167His	missense_variant, splice_region_variant	Exon 5 of 12		NM_000080.4	ENSP00000497829.1		Q04844
C17orf107	ENST00000381365.4 link	c.*1399C>T		3_prime_UTR_variant	Exon 3 of 3	2	NM_001145536.2	ENSP00000370770.3		Q6ZR85

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461256

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

726922

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33406

American (AMR)

AF:

0.00

AC:

AN:

44706

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39650

South Asian (SAS)

AF:

0.00

AC:

AN:

86240

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53330

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5720

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111746

Other (OTH)

AF:

0.00

AC:

AN:

60336

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Uncertain

0.12

BayesDel_noAF

Uncertain

-0.070

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.69

D;D

Eigen

Uncertain

0.63

Eigen_PC

Uncertain

0.56

FATHMM_MKL

Uncertain

0.80

LIST_S2

Uncertain

0.96

.;D

M_CAP

Pathogenic

0.41

MetaRNN

Pathogenic

0.86

D;D

MetaSVM

Uncertain

0.31

MutationAssessor

Uncertain

2.4

M;M

PhyloP100

1.7

PrimateAI

Benign

0.40

PROVEAN

Uncertain

-2.5

N;.

REVEL

Uncertain

0.58

Sift

Uncertain

0.025

D;.

Sift4G

Uncertain

0.044

D;.

Polyphen

1.0

D;D

Vest4

0.57

MutPred

0.71

Gain of glycosylation at T170 (P = 0.0693);Gain of glycosylation at T170 (P = 0.0693);

MVP

0.91

MPC

0.77

ClinPred

0.99

GERP RS

4.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.40

gMVP

0.82

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

1.0

SpliceAI score (max)

0.72

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.72

Position offset: 0

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over