NM_005458.8:c.2803C>G

Variant names:

• chr9-98290607-G-C
• NM_005458.8:c.2803C>G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_005458.8(GABBR2):​c.2803C>G​(p.Arg935Gly) variant causes a missense change. The variant allele was found at a frequency of 0.00000158 in 1,264,646 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: 31)
  • Exomes 𝑓: 0.0000016 (0 hom.)
• Consequence: GABBR2 NM_005458.8 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.59

Genes affected

GABBR2 (HGNC:4507): (gamma-aminobutyric acid type B receptor subunit 2) The multi-pass membrane protein encoded by this gene belongs to the G-protein coupled receptor 3 family and GABA-B receptor subfamily. The GABA-B receptors inhibit neuronal activity through G protein-coupled second-messenger systems, which regulate the release of neurotransmitters, and the activity of ion channels and adenylyl cyclase. This receptor subunit forms an active heterodimeric complex with GABA-B receptor subunit 1, neither of which is effective on its own. Allelic variants of this gene have been associated with nicotine dependence.[provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.38033587).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABBR2	NM_005458.8	c.2803C>G	p.Arg935Gly	missense_variant	Exon 19 of 19	ENST00000259455.4	NP_005449.5
GABBR2	XM_017015331.3	c.2509C>G	p.Arg837Gly	missense_variant	Exon 18 of 18		XP_016870820.1
GABBR2	XM_005252316.6	c.2029C>G	p.Arg677Gly	missense_variant	Exon 17 of 17		XP_005252373.1
GABBR2	XM_017015332.3	c.2029C>G	p.Arg677Gly	missense_variant	Exon 16 of 16		XP_016870821.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABBR2	ENST00000259455.4	c.2803C>G	p.Arg935Gly	missense_variant	Exon 19 of 19	1	NM_005458.8	ENSP00000259455.2
GABBR2	ENST00000637410.1	n.*40C>G		downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000158 AC: 2 AN: 1264646 Hom.: 0 Cov.: 31 AF XY: 0.00000162 AC XY: 1 AN XY: 615622

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000196

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.61
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.070
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.093	T
Eigen	Benign	0.18
Eigen_PC	Uncertain	0.34
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Uncertain	0.92	D
M_CAP	Benign	0.039	D
MetaRNN	Benign	0.38	T
MetaSVM	Benign	-0.40	T
MutationAssessor	Benign	0.34	N
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-0.99	N
REVEL	Uncertain	0.35
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.010	D
Polyphen		0.50	P
Vest4		0.63
MutPred		0.30		Loss of MoRF binding (P = 0);
MVP		0.78
MPC		1.1
ClinPred		0.82	D
GERP RS		5.5
Varity_R		0.29
gMVP		0.69

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-101052889;