rs79137415

Variant names:

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000748.3(CHRNB2):c.1432T>C(p.Phe478Leu) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000884 in 1,614,134 control chromosomes in the GnomAD database, including 39 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely benign in ClinVar.

Frequency

Genomes: 𝑓 0.00081 ( 4 hom., cov: 32)

Exomes 𝑓: 0.00089 ( 35 hom. )

Consequence

CHRNB2
NM_000748.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:9

Conservation

PhyloP100: 8.00

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.011089832).

BP6

Variant 1-154575855-T-C is Benign according to our data. Variant chr1-154575855-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 158332.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.000891 (1303/1461888) while in subpopulation AMR AF= 0.0288 (1288/44724). AF 95% confidence interval is 0.0275. There are 35 homozygotes in gnomad4_exome. There are 530 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck.

BS2

High AC in GnomAd4 at 124 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNB2	NM_000748.3 link	c.1432T>C	p.Phe478Leu	missense_variant	Exon 6 of 6	ENST00000368476.4	NP_000739.1	P17787Q5SXY3
CHRNB2	XM_017000180.3 link	c.922T>C	p.Phe308Leu	missense_variant	Exon 3 of 3		XP_016855669.1
CHRNB2	XR_001736952.3 link	n.1699T>C		non_coding_transcript_exon_variant	Exon 6 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CHRNB2	ENST00000368476.4 link	c.1432T>C	p.Phe478Leu	missense_variant	Exon 6 of 6	1	NM_000748.3	ENSP00000357461.3	P17787
CHRNB2	ENST00000637900.1 link	c.1438T>C	p.Phe480Leu	missense_variant	Exon 6 of 6	5		ENSP00000490474.1	A0A1B0GVD7
CHRNB2	ENST00000636034.1 link	n.1432T>C		non_coding_transcript_exon_variant	Exon 6 of 9	5		ENSP00000489703.1	A0A1B0GTH5

Frequencies

GnomAD3 genomes

AF:

0.000815

AC:

124

AN:

152128

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000966

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00760

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:

0.0000147

Gnomad OTH

AF:

0.00144

GnomAD3 exomes

AF:

0.00458

AC:

1152

AN:

251488

Hom.:

AF XY:

0.00339

AC XY:

461

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.0331

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:

0.00

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000891

AC:

1303

AN:

1461888

Hom.:

Cov.:

AF XY:

0.000729

AC XY:

530

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0288

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:

0.00000360

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.000814

AC:

124

AN:

152246

Hom.:

Cov.:

AF XY:

0.000887

AC XY:

AN XY:

74446

show subpopulations

Gnomad4 AFR

AF:

0.0000963

Gnomad4 AMR

AF:

0.00759

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00142

Alfa

AF:

0.000127

Hom.:

Bravo

AF:

0.00229

ESP6500AA

AF:

0.000454

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00353

AC:

429

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:9

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3

Sep 27, 2016

Genetic Services Laboratory, University of Chicago

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 10, 2014

Eurofins Ntd Llc (ga)

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 08, 2017

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Autosomal dominant nocturnal frontal lobe epilepsy 3

Benign:2

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: research

The heterozygous p.Phe478Leu variant in CHRNB2 has been identified in at least 1 individual with unexplained epilepsy (PMID: 21703448), but has also been identified in >3% of Latino chromosomes and 11 homozygotes by ExAC (http://gnomad.broadinstitute.org/). In summary, this variant meets criteria to be classified as benign for autosomal dominant idiopathic epilepsy. -

Jan 07, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Autosomal dominant nocturnal frontal lobe epilepsy

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Benign:1

Jun 13, 2016

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

CHRNB2-related disorder

Benign:1

Apr 29, 2019

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

not provided

Benign:1

Aug 31, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.97

BayesDel_addAF

Uncertain

0.064

BayesDel_noAF

Pathogenic

0.34

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.74

D;.

Eigen

Uncertain

0.59

Eigen_PC

Uncertain

0.58

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D

MetaRNN

Benign

0.011

T;T

MetaSVM

Uncertain

0.14

MutationAssessor

Benign

1.9

L;.

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-4.3

D;.

REVEL

Pathogenic

0.83

Sift

Benign

0.19

T;.

Sift4G

Benign

0.18

T;.

Polyphen

1.0

D;.

Vest4

0.76

MutPred

0.68

Loss of catalytic residue at Q480 (P = 0.0867);.;

MVP

0.98

MPC

0.67

ClinPred

0.058

GERP RS

4.9

Varity_R

0.70

gMVP

0.60

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

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