Genetic Variant NM_000748.3:c.10C>G (chr1-154568054-C-G) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_000748.3(CHRNB2):c.10C>G(p.Arg4Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000138 in 1,445,856 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 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. R4S) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

CHRNB2
NM_000748.3 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.138

Publications

0 publications found

Variant links:

Genes affected

CHRNB2 (HGNC:1962): (cholinergic receptor nicotinic beta 2 subunit) Neuronal acetylcholine receptors are homo- or heteropentameric complexes composed of homologous alpha and beta subunits. They belong to a superfamily of ligand-gated ion channels which allow the flow of sodium and potassium across the plasma membrane in response to ligands such as acetylcholine and nicotine. This gene encodes one of several beta subunits. Mutations in this gene are associated with autosomal dominant nocturnal frontal lobe epilepsy. [provided by RefSeq, Jul 2008]

CHRNB2 Gene-Disease associations (from GenCC):

familial sleep-related hypermotor epilepsy
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
autosomal dominant nocturnal frontal lobe epilepsy 3
Inheritance: AD Classification: STRONG Submitted by: G2P, Labcorp Genetics (formerly Invitae)
autosomal dominant nocturnal frontal lobe epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CHRNB2 links:

ENSG00000286391 (HGNC:):

ENSG00000286391 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.09424859).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNB2	NM_000748.3 link	c.10C>G	p.Arg4Gly	missense_variant	Exon 1 of 6	ENST00000368476.4	NP_000739.1	P17787Q5SXY3
CHRNB2	XR_001736952.3 link	n.277C>G		non_coding_transcript_exon_variant	Exon 1 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRNB2	ENST00000368476.4 link	c.10C>G	p.Arg4Gly	missense_variant	Exon 1 of 6	1	NM_000748.3	ENSP00000357461.3		P17787

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000138

AC:

AN:

1445856

Hom.:

Cov.:

AF XY:

0.00000139

AC XY:

AN XY:

718210

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:

33184

American (AMR)

AF:

0.00

AC:

AN:

43250

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25778

East Asian (EAS)

AF:

0.00

AC:

AN:

38914

South Asian (SAS)

AF:

0.00

AC:

AN:

83806

European-Finnish (FIN)

AF:

0.00

AC:

AN:

49250

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5704

European-Non Finnish (NFE)

AF:

0.00000181

AC:

AN:

1106266

Other (OTH)

AF:

0.00

AC:

AN:

59704

⚠️ 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: 0.300

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

0.070

BayesDel_addAF

Benign

-0.060

BayesDel_noAF

Benign

-0.32

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Benign

0.26

T;.

Eigen

Benign

-1.1

Eigen_PC

Benign

-1.0

FATHMM_MKL

Benign

0.015

LIST_S2

Benign

0.46

T;T

M_CAP

Benign

0.030

MetaRNN

Benign

0.094

T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

0.20

N;.

PhyloP100

0.14

PrimateAI

Benign

0.41

PROVEAN

Benign

-0.93

N;.

REVEL

Benign

0.24

Sift

Benign

0.076

T;.

Sift4G

Benign

0.20

T;.

Polyphen

0.0010

B;.

Vest4

0.39

MutPred

0.41

Loss of methylation at R4 (P = 0.0229);Loss of methylation at R4 (P = 0.0229);

MVP

0.80

MPC

1.4

ClinPred

0.18

GERP RS

-0.056

PromoterAI

-0.018

Neutral

(source)

Varity_R

0.10

gMVP

0.57

Mutation Taster

=86/14

polymorphism

(source)

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

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NM_000748.3:c.10C>G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over