chr15-78629395-C-G

Variant names:

• chr15-78629395-C-G
• rs758697498
• NM_000750.5:c.910G>C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_000750.5(CHRNB4):​c.910G>C​(p.Val304Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000658 in 152,054 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
• Consequence: CHRNB4 NM_000750.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.12

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CHRNB4	NM_000750.5	c.910G>C	p.Val304Leu	missense_variant	Exon 5 of 6	ENST00000261751.8	NP_000741.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CHRNB4	ENST00000261751.8	c.910G>C	p.Val304Leu	missense_variant	Exon 5 of 6	1	NM_000750.5	ENSP00000261751.3
CHRNB4	ENST00000412074.6	c.359+1681G>C		intron_variant	Intron 4 of 4	1		ENSP00000416386.2
CHRNB4	ENST00000559849.5	n.*966G>C		non_coding_transcript_exon_variant	Exon 12 of 12	1		ENSP00000457404.1
CHRNB4	ENST00000559849.5	n.*966G>C		3_prime_UTR_variant	Exon 12 of 12	1		ENSP00000457404.1

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152054 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152054 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74274

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

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: 0.00

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.24
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.32	T
Eigen	Uncertain	0.57
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.056	D
MetaRNN	Uncertain	0.68	D
MetaSVM	Uncertain	0.28	D
MutationAssessor	Uncertain	2.7	M
PrimateAI	Pathogenic	0.84	D
PROVEAN	Benign	-2.1	N
REVEL	Uncertain	0.57
Sift	Benign	0.030	D
Sift4G	Uncertain	0.017	D
Polyphen		0.76	P
Vest4		0.74
MutPred		0.44		Loss of catalytic residue at V304 (P = 0.0056);
MVP		0.72
MPC		1.0
ClinPred		0.98	D
GERP RS		5.6
Varity_R		0.41
gMVP		0.75

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

Other links and lift over

dbSNP: rs758697498; hg19: chr15-78921737;