Genetic Variant GABBR1:c.2713-52T>G (chr6-29603768-A-C) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_001470.4(GABBR1):c.2713-52T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000225 in 1,333,898 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: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

GABBR1
NM_001470.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.00

Publications

23 publications found

Variant links:

Genes affected

GABBR1 (HGNC:4070): (gamma-aminobutyric acid type B receptor subunit 1) This gene encodes a receptor for gamma-aminobutyric acid (GABA), which is the main inhibitory neurotransmitter in the mammalian central nervous system. This receptor functions as a heterodimer with GABA(B) receptor 2. Defects in this gene may underlie brain disorders such as schizophrenia and epilepsy. Alternative splicing generates multiple transcript variants, but the full-length nature of some of these variants has not been determined. [provided by RefSeq, Jan 2016]

GABBR1 Gene-Disease associations (from GenCC):

neurodevelopmental disorder with language delay and variable cognitive abnormalities
Inheritance: AD Classification: MODERATE Submitted by: G2P

GABBR1 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.92).

BS2

High AC in GnomAdExome4 at 28 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABBR1	NM_001470.4 link	c.2713-52T>G		intron_variant	Intron 22 of 22	ENST00000377034.9	NP_001461.1	Q9UBS5-1A0A1U9X7R0Q59HG8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABBR1	ENST00000377034.9 link	c.2713-52T>G		intron_variant	Intron 22 of 22	1	NM_001470.4	ENSP00000366233.4		Q9UBS5-1

Frequencies

GnomAD3 genomes

AF:

0.0000132

AC:

AN:

151672

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000312

AC:

AN:

96082

AF XY:

0.0000196

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.000369

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000237

AC:

AN:

1182226

Hom.:

Cov.:

AF XY:

0.0000244

AC XY:

AN XY:

573178

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26854

American (AMR)

AF:

0.00

AC:

AN:

17078

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

17032

East Asian (EAS)

AF:

0.00

AC:

AN:

34194

South Asian (SAS)

AF:

0.00

AC:

AN:

44896

European-Finnish (FIN)

AF:

0.000351

AC:

AN:

37036

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4882

European-Non Finnish (NFE)

AF:

0.0000147

AC:

AN:

951114

Other (OTH)

AF:

0.0000203

AC:

AN:

49140

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.523

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000132

AC:

AN:

151672

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74078

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41230

American (AMR)

AF:

0.00

AC:

AN:

15246

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5132

South Asian (SAS)

AF:

0.00

AC:

AN:

4796

European-Finnish (FIN)

AF:

0.000189

AC:

AN:

10570

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67930

Other (OTH)

AF:

0.00

AC:

AN:

2072

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00

Hom.:

3110

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.92

CADD

Benign

1.3

(source)

DANN

Benign

0.69

PhyloP100

-1.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.0

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over