6-89265642-C-T

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Strong BP6_Moderate

The NM_002043.5(GABRR2):c.860G>A(p.Arg287His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000444 in 1,614,022 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. 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. R287C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.00045 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00044 (2 hom.)
• Consequence: GABRR2 NM_002043.5 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 2.06

Genes affected

GABRR2 (HGNC:4091): (gamma-aminobutyric acid type A receptor subunit rho2) Gamma-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the mammalian brain where it acts at GABA receptors, which are ligand-gated chloride channels. The protein encoded by this gene is a member of the rho subunit family and is a component of the GABA type A receptor complex. This gene exists on chromosome 6q next to the gene encoding the rho 1 subunit of the GABA type A receptor, in a region thought to be associated with susceptibility for psychiatric disorders and epilepsy. Polymorphisms in this gene may also be associated with alcohol dependence, and general cognitive ability. [provided by RefSeq, Apr 2016]

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.047377884).
• BP6: Variant 6-89265642-C-T is Benign according to our data. Variant chr6-89265642-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 2270080.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABRR2	NM_002043.5	c.860G>A	p.Arg287His	missense_variant	7/9	ENST00000402938.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABRR2	ENST00000402938.4	c.860G>A	p.Arg287His	missense_variant	7/9	1	NM_002043.5	P1
GABRR2	ENST00000602432.1	n.691G>A		non_coding_transcript_exon_variant	4/6	2

Frequencies

GnomAD3 genomes AF: 0.000453 AC: 69 AN: 152168 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000965

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00111

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00949

Gnomad NFE AF: 0.000617

Gnomad OTH AF: 0.00143

GnomAD3 exomes AF: 0.000506 AC: 127 AN: 251164 Hom.: 0 AF XY: 0.000516 AC XY: 70 AN XY: 135734

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.000896

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000392

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000661

Gnomad OTH exome AF: 0.00130

GnomAD4 exome AF: 0.000443 AC: 647 AN: 1461736 Hom.: 2 Cov.: 31 AF XY: 0.000474 AC XY: 345 AN XY: 727172

Gnomad4 AFR exome AF: 0.000329

Gnomad4 AMR exome AF: 0.000962

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.000313

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000418

Gnomad4 OTH exome AF: 0.000878

GnomAD4 genome AF: 0.000453 AC: 69 AN: 152286 Hom.: 0 Cov.: 32 AF XY: 0.000389 AC XY: 29 AN XY: 74466

Gnomad4 AFR AF: 0.0000962

Gnomad4 AMR AF: 0.00111

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000617

Gnomad4 OTH AF: 0.00142

Alfa AF: 0.000548 Hom.: 0

Bravo AF: 0.000612

TwinsUK AF: 0.000809 AC: 3

ALSPAC AF: 0.000519 AC: 2

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000581 AC: 5

ExAC AF: 0.000478 AC: 58

EpiCase AF: 0.000709

EpiControl AF: 0.00113

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 07, 2021

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.39	T
BayesDel_noAF	Benign	-0.40
Cadd	Benign	19
Dann	Uncertain	0.99
DEOGEN2	Benign	0.12	T
Eigen	Benign	-0.075
Eigen_PC	Benign	0.060
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.80	T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.047	T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	1.3	L
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.25	T
REVEL	Benign	0.099
Sift4G	Benign	0.34	T
Vest4		0.36
MVP		0.86
MPC		0.19
ClinPred		0.039	T
GERP RS		3.6
Varity_R		0.076
gMVP		0.62

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: rs74529557; hg19: chr6-89975361;