NM_000750.5:c.1124C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000750.5(CHRNB4):c.1124C>T(p.Thr375Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000871 in 1,614,010 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★).

Frequency

Genomes: 𝑓 0.0045 ( 11 hom., cov: 32)

Exomes 𝑓: 0.00049 ( 4 hom. )

Consequence

CHRNB4
NM_000750.5 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 1.05

Publications

13 publications found

Variant links:

Genes affected

CHRNB4 (HGNC:1964): (cholinergic receptor nicotinic beta 4 subunit) This gene is found within a conserved gene cluster and encodes one of the beta subunits of the nicotinic acetylcholine receptor (nAChRs) superfamily which form ligand-gated ion channels with a central pore that forms a cation channel. Neuronal nAChRs are pentameric structures that can be either homomeric or heteromeric, with heteromeric structures containing both alpha and beta subunits. Each subunit contains an extracellular amino terminus and four transmembrane domains. Nicotine is one of the agonists that binds to the receptor. Variants in this gene have been associated with nicotine dependence and lung cancer. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Sep 2017]

CHRNB4 Gene-Disease associations (from GenCC):

lung cancer
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

CHRNB4 links:

ENSG00000259555 (HGNC:):

ENSG00000259555 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0057582557).

BP6

Variant 15-78629181-G-A is Benign according to our data. Variant chr15-78629181-G-A is described in ClinVar as Benign. ClinVar VariationId is 779904.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAdExome4 allele frequency = 0.00049 (716/1461774) while in subpopulation AFR AF = 0.0165 (551/33480). AF 95% confidence interval is 0.0153. There are 4 homozygotes in GnomAdExome4. There are 304 alleles in the male GnomAdExome4 subpopulation. Median coverage is 31. This position passed quality control check.

BS2

High AC in GnomAd4 at 689 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNB4	NM_000750.5 link	c.1124C>T	p.Thr375Ile	missense_variant	Exon 5 of 6	ENST00000261751.8	NP_000741.1	P30926-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CHRNB4	ENST00000261751.8 link	c.1124C>T	p.Thr375Ile	missense_variant	Exon 5 of 6	1	NM_000750.5	ENSP00000261751.3	P30926-1
CHRNB4	ENST00000412074.6 link	c.359+1895C>T		intron_variant	Intron 4 of 4	1		ENSP00000416386.2	P30926-2
ENSG00000259555	ENST00000821537.1 link	n.312+1616G>A		intron_variant	Intron 2 of 2
CHRNB4	ENST00000559849.5 link	n.*1180C>T		downstream_gene_variant		1		ENSP00000457404.1	H3BU02

Frequencies

GnomAD3 genomes

AF:

0.00450

AC:

684

AN:

152118

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0157

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00118

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:

0.0000588

Gnomad OTH

AF:

0.00621

GnomAD2 exomes

AF:

0.00122

AC:

307

AN:

251032

AF XY:

0.000788

show subpopulations

Gnomad AFR exome

AF:

0.0165

Gnomad AMR exome

AF:

0.000926

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000617

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000490

AC:

716

AN:

1461774

Hom.:

Cov.:

AF XY:

0.000418

AC XY:

304

AN XY:

727174

show subpopulations

African (AFR)

AF:

0.0165

AC:

551

AN:

33480

American (AMR)

AF:

0.00105

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000232

AC:

AN:

86252

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53406

Middle Eastern (MID)

AF:

0.00503

AC:

AN:

5766

European-Non Finnish (NFE)

AF:

0.0000207

AC:

AN:

1111926

Other (OTH)

AF:

0.00106

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.481

Heterozygous variant carriers

146

194

243

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00453

AC:

689

AN:

152236

Hom.:

Cov.:

AF XY:

0.00437

AC XY:

325

AN XY:

74432

show subpopulations

African (AFR)

AF:

0.0157

AC:

654

AN:

41552

American (AMR)

AF:

0.00118

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5174

South Asian (SAS)

AF:

0.00

AC:

AN:

4812

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000588

AC:

AN:

68014

Other (OTH)

AF:

0.00615

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

125

156

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00160

Hom.:

Bravo

AF:

0.00518

ESP6500AA

AF:

0.0164

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00152

AC:

185

EpiCase

AF:

0.000109

EpiControl

AF:

0.000237

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:2

Feb 25, 2018

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.086

BayesDel_addAF

Benign

-0.51

BayesDel_noAF

Benign

-0.49

CADD

Benign

9.0

(source)

DANN

Benign

0.66

DEOGEN2

Benign

0.18

Eigen

Benign

-0.62

Eigen_PC

Benign

-0.65

FATHMM_MKL

Benign

0.32

LIST_S2

Benign

0.34

MetaRNN

Benign

0.0058

MetaSVM

Benign

-0.89

MutationAssessor

Benign

1.2

PhyloP100

1.1

PrimateAI

Benign

0.33

PROVEAN

Benign

-0.49

REVEL

Benign

0.083

Sift

Benign

0.26

Sift4G

Benign

0.23

Polyphen

0.21

Vest4

0.24

MVP

0.79

MPC

0.33

ClinPred

0.0072

GERP RS

2.9

Varity_R

0.052

gMVP

0.19

Mutation Taster

=97/3

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over