rs2280781

Positions:

• chr1-154567992-C-A
• chr1-154567992-C-G
• chr1-154567992-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_000748.3(CHRNB2):​c.-53C>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 0.0000887 in 1,477,652 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000084 (0 hom.)
• Consequence: CHRNB2 NM_000748.3 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.486

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 -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BS1: Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000131 (20/152160) while in subpopulation AMR AF= 0.000523 (8/15282). AF 95% confidence interval is 0.00026. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High AC in GnomAd4 at 20 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CHRNB2	NM_000748.3	c.-53C>A		5_prime_UTR_variant	1/6	ENST00000368476.4	NP_000739.1
CHRNB2	XR_001736952.3	n.215C>A		non_coding_transcript_exon_variant	1/7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CHRNB2	ENST00000368476	c.-53C>A		5_prime_UTR_variant	1/6	1	NM_000748.3	ENSP00000357461.3
CHRNB2	ENST00000637900	c.-53C>A		5_prime_UTR_variant	1/6	5		ENSP00000490474.1
CHRNB2	ENST00000636034.1	n.-53C>A		non_coding_transcript_exon_variant	1/9	5		ENSP00000489703.1
CHRNB2	ENST00000636034.1	n.-53C>A		5_prime_UTR_variant	1/9	5		ENSP00000489703.1

Frequencies

GnomAD3 genomes AF: 0.000131 AC: 20 AN: 152160 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000523

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: 0.000132

Gnomad OTH AF: 0.000478

GnomAD4 exome AF: 0.0000837 AC: 111 AN: 1325492 Hom.: 0 Cov.: 28 AF XY: 0.0000750 AC XY: 49 AN XY: 653344

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000663

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000325

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.0000278

Gnomad4 NFE exome AF: 0.0000819

Gnomad4 OTH exome AF: 0.0000727

GnomAD4 genome AF: 0.000131 AC: 20 AN: 152160 Hom.: 0 Cov.: 32 AF XY: 0.000135 AC XY: 10 AN XY: 74320

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000132

Gnomad4 OTH AF: 0.000478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	8.2
DANN	Benign	0.59

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: rs2280781; hg19: chr1-154540468;