17-7445115-G-C

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_000747.3(CHRNB1):c.-13G>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000509 in 1,606,214 control chromosomes in the GnomAD database, including 4 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0026 ( 3 hom., cov: 33)

Exomes 𝑓: 0.00029 ( 1 hom. )

Consequence

CHRNB1
NM_000747.3 5_prime_UTR

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: -2.97

Variant links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -20 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.9).

BP6

Variant 17-7445115-G-C is Benign according to our data. Variant chr17-7445115-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 325073.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00261 (398/152284) while in subpopulation AFR AF= 0.00922 (383/41560). AF 95% confidence interval is 0.00845. There are 3 homozygotes in gnomad4. There are 197 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.

BS2

High Homozygotes in GnomAd at 3 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CHRNB1	NM_000747.3 linkuse as main transcript	c.-13G>C		5_prime_UTR_variant	1/11	ENST00000306071.7

Ensembl

Gene	Transcript	HGVSc	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CHRNB1	ENST00000306071.7 linkuse as main transcript	c.-13G>C	5_prime_UTR_variant	1/11	1	NM_000747.3	P1	P11230-1
CHRNB1	ENST00000572857.5 linkuse as main transcript	c.-13G>C	5_prime_UTR_variant	1/6	4
CHRNB1	ENST00000574054.1 linkuse as main transcript	n.8G>C	non_coding_transcript_exon_variant	1/2	2

Frequencies

GnomAD3 genomes

AF:

0.00262

AC:

398

AN:

152168

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00924

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000654

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:

0.00191

GnomAD3 exomes

AF:

0.000721

AC:

165

AN:

228986

Hom.:

AF XY:

0.000559

AC XY:

AN XY:

126990

show subpopulations

Gnomad AFR exome

AF:

0.00944

Gnomad AMR exome

AF:

0.00101

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000396

Gnomad OTH exome

AF:

0.000358

GnomAD4 exome

AF:

0.000288

AC:

419

AN:

1453930

Hom.:

Cov.:

AF XY:

0.000213

AC XY:

154

AN XY:

723236

show subpopulations

Gnomad4 AFR exome

AF:

0.00898

Gnomad4 AMR exome

AF:

0.000923

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000351

Gnomad4 OTH exome

AF:

0.000617

GnomAD4 genome

AF:

0.00261

AC:

398

AN:

152284

Hom.:

Cov.:

AF XY:

0.00265

AC XY:

197

AN XY:

74468

show subpopulations

Gnomad4 AFR

AF:

0.00922

Gnomad4 AMR

AF:

0.000653

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:

0.00189

Alfa

AF:

0.00132

Hom.:

Bravo

AF:

0.00286

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Nov 10, 2016

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

CHRNB1-related disorder

Benign:1

Benign, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Mar 03, 2020

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Congenital myasthenic syndrome 4C

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.90

Cadd

Benign

0.32

Dann

Benign

0.48

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

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

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