chr9-98290633-C-G

Position:

• chr9-98290633-C-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP6_Moderate

The NM_005458.8(GABBR2):​c.2777G>C​(p.Arg926Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely benign (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R926H) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 31)
• Consequence: GABBR2 NM_005458.8 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 7.90

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
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GABBR2. . Gene score misZ 4.6253 (greater than the threshold 3.09). Trascript score misZ 4.0975 (greater than threshold 3.09). GenCC has associacion of gene with developmental and epileptic encephalopathy, 59, neurodevelopmental disorder with poor language and loss of hand skills, atypical Rett syndrome.
• BP6: Variant 9-98290633-C-G is Benign according to our data. Variant chr9-98290633-C-G is described in ClinVar as [Likely_benign]. Clinvar id is 1125841.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABBR2	NM_005458.8	c.2777G>C	p.Arg926Pro	missense_variant	19/19	ENST00000259455.4
GABBR2	XM_017015331.3	c.2483G>C	p.Arg828Pro	missense_variant	18/18
GABBR2	XM_005252316.6	c.2003G>C	p.Arg668Pro	missense_variant	17/17
GABBR2	XM_017015332.3	c.2003G>C	p.Arg668Pro	missense_variant	16/16

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABBR2	ENST00000259455.4	c.2777G>C	p.Arg926Pro	missense_variant	19/19	1	NM_005458.8	P1
GABBR2	ENST00000637410.1			downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Epileptic encephalopathy Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Feb 02, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.44
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Benign	0.087	T
Eigen	Pathogenic	0.70
Eigen_PC	Pathogenic	0.74
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D
M_CAP	Uncertain	0.12	D
MetaRNN	Uncertain	0.58	D
MetaSVM	Uncertain	0.24	D
MutationAssessor	Benign	0.55	N
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.81	D
PROVEAN	Benign	-0.86	N
REVEL	Uncertain	0.45
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.58
MutPred		0.19		Gain of glycosylation at R926 (P = 0.0171);
MVP		0.70
MPC		2.3
ClinPred		0.96	D
GERP RS		5.5
Varity_R		0.64
gMVP		0.44

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: chr9-101052915;