Genetic Variant GABBR2:c.*302_*303insC (chr9-98290281-T-TG) – ACMG Classification: Benign (-10 pts)

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP6_ModerateBS1BS2

The NM_005458.8(GABBR2):c.*302_*303insC variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000465 in 154,868 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Benign (★).

Frequency

Genomes: 𝑓 0.00032 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00097 ( 0 hom. )

Consequence

GABBR2
NM_005458.8 3_prime_UTR

Scores

Not classified

Clinical Significance

Benign criteria provided, single submitter B:1

Conservation

PhyloP100: 1.15

Variant links:

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]

GABBR2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -10 ACMG points.

BP6

Variant 9-98290281-T-TG is Benign according to our data. Variant chr9-98290281-T-TG is described in ClinVar as [Benign]. Clinvar id is 1302046.Status of the report is criteria_provided_single_submitter, 1 stars.

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.000972 (33/33964) while in subpopulation AFR AF= 0.0282 (28/994). AF 95% confidence interval is 0.02. There are 0 homozygotes in gnomad4_exome. There are 17 alleles in male gnomad4_exome subpopulation. Median coverage is 0. This position pass quality control queck.

BS2

High AC in GnomAd4 at 39 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein	UniProt
GABBR2	NM_005458.8 link	c.302_303insC	3_prime_UTR_variant	Exon 19 of 19	ENST00000259455.4	NP_005449.5	O75899H9NIL8
GABBR2	XM_017015331.3 link	c.302_303insC	3_prime_UTR_variant	Exon 18 of 18		XP_016870820.1
GABBR2	XM_005252316.6 link	c.302_303insC	3_prime_UTR_variant	Exon 17 of 17		XP_005252373.1
GABBR2	XM_017015332.3 link	c.302_303insC	3_prime_UTR_variant	Exon 16 of 16		XP_016870821.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABBR2	ENST00000259455 link	c.302_303insC		3_prime_UTR_variant	Exon 19 of 19	1	NM_005458.8	ENSP00000259455.2		O75899

Frequencies

GnomAD3 genomes

AF:

0.000323

AC:

AN:

120878

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00267

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000972

AC:

AN:

33964

Hom.:

Cov.:

AF XY:

0.000979

AC XY:

AN XY:

17364

show subpopulations

Gnomad4 AFR exome

AF:

0.0282

Gnomad4 AMR exome

AF:

0.00205

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:

0.0000454

Gnomad4 OTH exome

AF:

0.000859

GnomAD4 genome

AF:

0.000323

AC:

AN:

120904

Hom.:

Cov.:

AF XY:

0.000404

AC XY:

AN XY:

59394

show subpopulations

Gnomad4 AFR

AF:

0.00267

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:

0.00

Gnomad4 OTH

AF:

0.00

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Benign:1

Aug 04, 2021

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over