rs144813907

chr1-154575908-C-Gchr1-154575908-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000748.3(CHRNB2):c.1485C>G(p.Asp495Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000656 in 152,332 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. D495D) has been classified as Likely benign.

• Frequency: Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
• Consequence: CHRNB2 NM_000748.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.80

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.11137149).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHRNB2	NM_000748.3	c.1485C>G	p.Asp495Glu	missense_variant	6/6	ENST00000368476.4
CHRNB2	XM_017000180.3	c.975C>G	p.Asp325Glu	missense_variant	3/3
CHRNB2	XR_001736952.3	n.1752C>G		non_coding_transcript_exon_variant	6/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHRNB2	ENST00000368476.4	c.1485C>G	p.Asp495Glu	missense_variant	6/6	1	NM_000748.3	P4
CHRNB2	ENST00000637900.1	c.1491C>G	p.Asp497Glu	missense_variant	6/6	5		A1
CHRNB2	ENST00000636034.1	c.1485C>G	p.Asp495Glu	missense_variant, NMD_transcript_variant	6/9	5

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152214 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.00000656 AC: 1 AN: 152332 Hom.: 0 Cov.: 32 AF XY: 0.0000134 AC XY: 1 AN XY: 74478

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.068
BayesDel_addAF	Benign	-0.097	T
BayesDel_noAF	Benign	-0.38
Cadd	Benign	13
Dann	Uncertain	0.99
DEOGEN2	Benign	0.20	T;.
Eigen	Benign	-0.43
Eigen_PC	Benign	-0.25
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.61	T;T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.46	N;.
MutationTaster	Benign	0.67	D
PrimateAI	Benign	0.35	T
PROVEAN	Benign	-0.47	N;.
REVEL	Benign	0.17
Sift	Benign	0.18	T;.
Sift4G	Benign	0.90	T;.
Polyphen		0.0040	B;.
Vest4		0.16
MutPred		0.14		Gain of disorder (P = 0.1644);.;
MVP		0.73
MPC		0.14
ClinPred		0.25	T
GERP RS		4.2
Varity_R		0.065
gMVP		0.30

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: rs144813907; hg19: chr1-154548384;