1-154569474-C-T

Variant names:

Variant summary

Our verdict is Benign. Variant got -16 ACMG points: 0P and 16B. BP4_StrongBP6_Very_StrongBS2

The NM_000748.3(CHRNB2):c.77C>T(p.Thr26Met) variant causes a missense change. The variant allele was found at a frequency of 0.000813 in 1,613,812 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. T26T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00053 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00084 ( 2 hom. )

Consequence

CHRNB2
NM_000748.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: 4.14

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 -16 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.055544734).

BP6

Variant 1-154569474-C-T is Benign according to our data. Variant chr1-154569474-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 205061.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-154569474-C-T is described in Lovd as [Likely_benign].

BS2

High AC in GnomAd4 at 80 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNB2	NM_000748.3 link	c.77C>T	p.Thr26Met	missense_variant	Exon 2 of 6	ENST00000368476.4	NP_000739.1	P17787Q5SXY3
CHRNB2	XR_001736952.3 link	n.344C>T		non_coding_transcript_exon_variant	Exon 2 of 7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CHRNB2	ENST00000368476.4 link	c.77C>T	p.Thr26Met	missense_variant	Exon 2 of 6	1	NM_000748.3	ENSP00000357461.3	P17787
CHRNB2	ENST00000637900.1 link	c.77C>T	p.Thr26Met	missense_variant	Exon 2 of 6	5		ENSP00000490474.1	A0A1B0GVD7
CHRNB2	ENST00000636034.1 link	n.77C>T		non_coding_transcript_exon_variant	Exon 2 of 9	5		ENSP00000489703.1	A0A1B0GTH5
CHRNB2	ENST00000636695.1 link	n.-54C>T		upstream_gene_variant		5

Frequencies

GnomAD3 genomes

AF:

0.000526

AC:

AN:

152026

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000622

Gnomad FIN

AF:

0.0000943

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000985

Gnomad OTH

AF:

0.000479

GnomAD3 exomes

AF:

0.000677

AC:

170

AN:

251214

Hom.:

AF XY:

0.000766

AC XY:

104

AN XY:

135792

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000318

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad SAS exome

AF:

0.000654

Gnomad FIN exome

AF:

0.000139

Gnomad NFE exome

AF:

0.00115

Gnomad OTH exome

AF:

0.000652

GnomAD4 exome

AF:

0.000843

AC:

1232

AN:

1461668

Hom.:

Cov.:

AF XY:

0.000825

AC XY:

600

AN XY:

727130

show subpopulations

Gnomad4 AFR exome

AF:

0.000149

Gnomad4 AMR exome

AF:

0.000380

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000696

Gnomad4 FIN exome

AF:

0.000243

Gnomad4 NFE exome

AF:

0.000986

Gnomad4 OTH exome

AF:

0.000662

GnomAD4 genome

AF:

0.000526

AC:

AN:

152144

Hom.:

Cov.:

AF XY:

0.000565

AC XY:

AN XY:

74388

show subpopulations

Gnomad4 AFR

AF:

0.000145

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000622

Gnomad4 FIN

AF:

0.0000943

Gnomad4 NFE

AF:

0.000986

Gnomad4 OTH

AF:

0.000474

Alfa

AF:

0.000677

Hom.:

Bravo

AF:

0.000567

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.000815

AC:

EpiCase

AF:

0.000763

EpiControl

AF:

0.00107

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

May 01, 2022

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

CHRNB2: BS1, BS2 -

Nov 06, 2019

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Benign:1

Jan 30, 2020

Athena Diagnostics

Significance: 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: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Inborn genetic diseases

Benign:1

May 08, 2019

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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.21

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.31

T;.

Eigen

Uncertain

0.44

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Uncertain

0.97

LIST_S2

Uncertain

0.89

D;D

M_CAP

Benign

0.080

MetaRNN

Benign

0.056

T;T

MetaSVM

Uncertain

-0.23

MutationAssessor

Benign

1.2

L;.

PrimateAI

Uncertain

0.48

PROVEAN

Benign

-1.3

N;.

REVEL

Uncertain

0.31

Sift

Benign

0.075

T;.

Sift4G

Uncertain

0.011

D;.

Polyphen

1.0

D;.

Vest4

0.25

MVP

0.75

MPC

1.2

ClinPred

0.074

GERP RS

4.5

Varity_R

0.072

gMVP

0.50

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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