1-154567994-C-A

Position:

• chr1-154567994-C-A

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_000748.3(CHRNB2):​c.-51C>A variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00158 in 1,480,666 control chromosomes in the GnomAD database, including 28 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0079 (16 hom., cov: 32)
  • Exomes 𝑓: 0.00086 (12 hom.)
• Consequence: CHRNB2 NM_000748.3 5_prime_UTR
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: -0.454

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]

CHRNB2 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).
• BP6: Variant 1-154567994-C-A is Benign according to our data. Variant chr1-154567994-C-A is described in ClinVar as [Likely_benign]. Clinvar id is 673238.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 = 0.00785 (1196/152286) while in subpopulation AFR AF= 0.026 (1081/41570). AF 95% confidence interval is 0.0247. There are 16 homozygotes in gnomad4. There are 577 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 1196 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHRNB2	NM_000748.3	c.-51C>A		5_prime_UTR_variant	1/6	ENST00000368476.4	NP_000739.1
CHRNB2	XR_001736952.3	n.217C>A		non_coding_transcript_exon_variant	1/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHRNB2	ENST00000368476	c.-51C>A		5_prime_UTR_variant	1/6	1	NM_000748.3	ENSP00000357461.3
CHRNB2	ENST00000637900	c.-51C>A		5_prime_UTR_variant	1/6	5		ENSP00000490474.1
CHRNB2	ENST00000636034.1	n.-51C>A		non_coding_transcript_exon_variant	1/9	5		ENSP00000489703.1
CHRNB2	ENST00000636034.1	n.-51C>A		5_prime_UTR_variant	1/9	5		ENSP00000489703.1

Frequencies

GnomAD3 genomes AF: 0.00781 AC: 1189 AN: 152180 Hom.: 16 Cov.: 32

Gnomad AFR AF: 0.0259

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00438

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00578

Gnomad SAS AF: 0.000620

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00318

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00621

GnomAD3 exomes AF: 0.00139 AC: 122 AN: 87910 Hom.: 1 AF XY: 0.00106 AC XY: 53 AN XY: 49940

Gnomad AFR exome AF: 0.0369

Gnomad AMR exome AF: 0.000948

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00631

Gnomad SAS exome AF: 0.000497

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000297

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000861 AC: 1144 AN: 1328380 Hom.: 12 Cov.: 29 AF XY: 0.000797 AC XY: 522 AN XY: 654912

Gnomad4 AFR exome AF: 0.0278

Gnomad4 AMR exome AF: 0.00153

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00330

Gnomad4 SAS exome AF: 0.000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000475

Gnomad4 OTH exome AF: 0.00268

GnomAD4 genome AF: 0.00785 AC: 1196 AN: 152286 Hom.: 16 Cov.: 32 AF XY: 0.00775 AC XY: 577 AN XY: 74454

Gnomad4 AFR AF: 0.0260

Gnomad4 AMR AF: 0.00431

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00560

Gnomad4 SAS AF: 0.000621

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00663

Alfa AF: 0.000510 Hom.: 0

Bravo AF: 0.00943

Asia WGS AF: 0.00723 AC: 25 AN: 3470

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Benign:2

Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -
Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Jun 19, 2018	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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	5.9
DANN	Benign	0.68

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: rs111862660; hg19: chr1-154540470;