rs144985640

chr9-98496475-T-C

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 1P and 13B. PP2 BP4 BP6_Very_Strong BS2

The NM_005458.8(GABBR2):c.670A>G(p.Ile224Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000378 in 1,613,260 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. I224I) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000036 (0 hom.)
• Consequence: GABBR2 NM_005458.8 missense
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:2
• Conservation: PhyloP100: 7.58

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 Benign. Variant got -12 ACMG points.

• PP2: Missense variant where missense usually causes diseases, GABBR2
• BP4: Computational evidence support a benign effect (MetaRNN=0.33621308).
• BP6: Variant 9-98496475-T-C is Benign according to our data. Variant chr9-98496475-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 568723.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS2: High AC in GnomAd at 8 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABBR2	NM_005458.8	c.670A>G	p.Ile224Val	missense_variant	4/19	ENST00000259455.4
GABBR2	XM_017015331.3	c.376A>G	p.Ile126Val	missense_variant	3/18
GABBR2	XM_005252316.6	c.-105A>G		5_prime_UTR_variant	2/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABBR2	ENST00000259455.4	c.670A>G	p.Ile224Val	missense_variant	4/19	1	NM_005458.8	P1

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152096 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000966

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000478 AC: 12 AN: 251240 Hom.: 0 AF XY: 0.0000589 AC XY: 8 AN XY: 135800

Gnomad AFR exome AF: 0.0000616

Gnomad AMR exome AF: 0.0000578

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: 0.0000792

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000363 AC: 53 AN: 1461164 Hom.: 0 Cov.: 29 AF XY: 0.0000426 AC XY: 31 AN XY: 726936

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.0000447

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: 0.0000369

Gnomad4 OTH exome AF: 0.0000662

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152096 Hom.: 0 Cov.: 32 AF XY: 0.0000404 AC XY: 3 AN XY: 74300

Gnomad4 AFR AF: 0.0000966

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.0000488 Hom.: 0

Bravo AF: 0.0000491

TwinsUK AF: 0.00 AC: 0

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ExAC AF: 0.0000494 AC: 6

EpiCase AF: 0.0000545

EpiControl AF: 0.000178

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 21, 2022

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Epileptic encephalopathy Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Jan 07, 2024

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.44
Cadd	Benign	21
Dann	Uncertain	1.0
DEOGEN2	Benign	0.16	T
Eigen	Benign	-0.023
Eigen_PC	Benign	0.13
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.70	T
M_CAP	Benign	0.012	T
MetaRNN	Benign	0.34	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.63	T
PROVEAN	Benign	-0.59	N
REVEL	Benign	0.093
Sift	Benign	0.32	T
Sift4G	Benign	0.28	T
Polyphen		0.13	B
Vest4		0.60
MVP		0.46
MPC		2.0
ClinPred		0.11	T
GERP RS		4.7
Varity_R		0.13
gMVP		0.65

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: rs144985640; hg19: chr9-101258757;