rs759668768

Variant names:

• chr17-7445378-T-C
• rs759668768
• NM_000747.3:c.167T>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 0P and 0B.

The NM_000747.3(CHRNB1):​c.167T>C​(p.Val56Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000245 in 1,612,490 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V56I) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00026 (1 hom.)
• Consequence: CHRNB1 NM_000747.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:6
• Conservation: PhyloP100: 6.13
• Publications: 1 publications found

Genes affected

CHRNB1 (HGNC:1961): (cholinergic receptor nicotinic beta 1 subunit) The muscle acetylcholine receptor is composed of five subunits: two alpha subunits and one beta, one gamma, and one delta subunit. This gene encodes the beta subunit of the acetylcholine receptor. The acetylcholine receptor changes conformation upon acetylcholine binding leading to the opening of an ion-conducting channel across the plasma membrane. Mutations in this gene are associated with slow-channel congenital myasthenic syndrome. [provided by RefSeq, Jul 2008]

CHRNB1 Gene-Disease associations (from GenCC):

• congenital myasthenic syndrome 2C

  Inheritance: AR, AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P, Ambry Genetics
• congenital myasthenic syndrome 2A

  Inheritance: AD Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, Genomics England PanelApp, Ambry Genetics
• postsynaptic congenital myasthenic syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000272884 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000747.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRNB1	NM_000747.3	MANE Select	c.167T>C	p.Val56Ala	missense	Exon 2 of 11	NP_000738.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRNB1	ENST00000306071.7	TSL:1 MANE Select	c.167T>C	p.Val56Ala	missense	Exon 2 of 11	ENSP00000304290.2	P11230-1
	ENSG00000272884	ENST00000575331.1	TSL:1	n.4965T>C		non_coding_transcript_exon	Exon 3 of 3
	CHRNB1	ENST00000570557.5	TSL:5	c.38T>C	p.Val13Ala	missense	Exon 1 of 8	ENSP00000460648.1	I3L3Q9

Frequencies

GnomAD3 genomes AF: 0.000125 AC: 19 AN: 151978 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000196

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: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000160 AC: 39 AN: 243802 AF XY: 0.000120

Gnomad AFR exome AF: 0.000129

Gnomad AMR exome AF: 0.000117

Gnomad ASJ exome AF: 0.000406

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000240

Gnomad OTH exome AF: 0.000336

GnomAD4 exome AF: 0.000257 AC: 376 AN: 1460512 Hom.: 1 Cov.: 34 AF XY: 0.000234 AC XY: 170 AN XY: 726564

African (AFR) AF: 0.0000598 AC: 2 AN: 33464

American (AMR) AF: 0.000112 AC: 5 AN: 44684

Ashkenazi Jewish (ASJ) AF: 0.000498 AC: 13 AN: 26108

East Asian (EAS) AF: 0.0000252 AC: 1 AN: 39688

South Asian (SAS) AF: 0.0000116 AC: 1 AN: 86212

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52502

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5766

European-Non Finnish (NFE) AF: 0.000310 AC: 345 AN: 1111764

Other (OTH) AF: 0.000149 AC: 9 AN: 60324

GnomAD4 genome AF: 0.000125 AC: 19 AN: 151978 Hom.: 0 Cov.: 32 AF XY: 0.0000808 AC XY: 6 AN XY: 74242

African (AFR) AF: 0.000121 AC: 5 AN: 41356

American (AMR) AF: 0.000196 AC: 3 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5152

South Asian (SAS) AF: 0.00 AC: 0 AN: 4822

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10608

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 67990

Other (OTH) AF: 0.00 AC: 0 AN: 2084

Alfa AF: 0.0000988 Hom.: 0

Bravo AF: 0.000193

ExAC AF: 0.000157 AC: 19

EpiCase AF: 0.000164

EpiControl AF: 0.000296

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
-	2	-	Congenital myasthenic syndrome 4C (2)
-	1	-	Congenital myasthenic syndrome 2A (1)
-	1	-	Inborn genetic diseases (1)
-	1	-	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.38
BayesDel_addAF	Benign	-0.095	T
BayesDel_noAF	Uncertain	-0.080
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.54	D
Eigen	Pathogenic	0.74
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Uncertain	0.97	D
M_CAP	Benign	0.067	D
MetaRNN	Uncertain	0.63	D
MetaSVM	Uncertain	0.31	D
MutationAssessor	Uncertain	2.5	M
PhyloP100		6.1
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-2.6	D
REVEL	Pathogenic	0.69
Sift	Uncertain	0.0070	D
Sift4G	Uncertain	0.0060	D
Polyphen		0.84	P
Vest4		0.50
MVP		0.92
MPC		1.2
ClinPred		0.58	D
GERP RS		5.4
PromoterAI		0.015	Neutral
Varity_R		0.22
gMVP		0.61
Mutation Taster		=81/19	polymorphism

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

Other links and lift over

dbSNP: rs759668768; hg19: chr17-7348697;