12-6841239-G-T

Variant names:

• chr12-6841239-G-T
• rs28395781
• NM_002075.4:c.-30-19G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_002075.4(GNB3):​c.-30-19G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000735 in 1,361,326 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: not found (cov: 32)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: GNB3 NM_002075.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.449
• Publications: 0 publications found

Genes affected

GNB3 (HGNC:4400): (G protein subunit beta 3) Heterotrimeric guanine nucleotide-binding proteins (G proteins), which integrate signals between receptors and effector proteins, are composed of an alpha, a beta, and a gamma subunit. These subunits are encoded by families of related genes. This gene encodes a beta subunit which belongs to the WD repeat G protein beta family. Beta subunits are important regulators of alpha subunits, as well as of certain signal transduction receptors and effectors. A single-nucleotide polymorphism (C825T) in this gene is associated with essential hypertension and obesity. This polymorphism is also associated with the occurrence of the splice variant GNB3-s, which appears to have increased activity. GNB3-s is an example of alternative splicing caused by a nucleotide change outside of the splice donor and acceptor sites. Alternative splicing results in multiple transcript variants. Additional alternatively spliced transcript variants of this gene have been described, but their full-length nature is not known. [provided by RefSeq, Jul 2014]

GNB3 Gene-Disease associations (from GenCC):

• congenital stationary night blindness

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• congenital stationary night blindness 1H

  Inheritance: AR, Unknown Classification: LIMITED Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.9).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002075.4. 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
	GNB3	NM_002075.4	MANE Select	c.-30-19G>T		intron	N/A	NP_002066.1	P16520-1
	GNB3	NM_001297571.2		c.-30-19G>T		intron	N/A	NP_001284500.1	E9PCP0

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNB3	ENST00000229264.8	TSL:5 MANE Select	c.-30-19G>T		intron	N/A	ENSP00000229264.3	P16520-1
	GNB3	ENST00000435982.6	TSL:1	c.-30-19G>T		intron	N/A	ENSP00000414734.2	E9PCP0
	GNB3	ENST00000542868.1	TSL:1	n.199G>T		non_coding_transcript_exon	Exon 1 of 2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.35e-7 AC: 1 AN: 1361326 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 679770

African (AFR) AF: 0.00 AC: 0 AN: 30898

American (AMR) AF: 0.00 AC: 0 AN: 41848

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24308

East Asian (EAS) AF: 0.00 AC: 0 AN: 36646

South Asian (SAS) AF: 0.0000122 AC: 1 AN: 82062

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50180

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5434

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1033868

Other (OTH) AF: 0.00 AC: 0 AN: 56082

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.21
DANN	Benign	0.73
PhyloP100		-0.45
PromoterAI		-0.039	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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: rs28395781; hg19: chr12-6950403;