chr4-47338878-A-G

Position:

• chr4-47338878-A-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000812.4(GABRB1):​c.544+18669A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.437 in 152,040 control chromosomes in the GnomAD database, including 14,975 homozygotes. 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 0.44 (14975 hom., cov: 32)
• Consequence: GABRB1 NM_000812.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.458

Genes affected

GABRB1 (HGNC:4081): (gamma-aminobutyric acid type A receptor subunit beta1) The gamma-aminobutyric acid (GABA) A receptor is a multisubunit chloride channel that mediates the fastest inhibitory synaptic transmission in the central nervous system. This gene encodes GABA A receptor, beta 1 subunit. It is mapped to chromosome 4p12 in a cluster comprised of genes encoding alpha 4, alpha 2 and gamma 1 subunits of the GABA A receptor. Alteration of this gene is implicated in the pathogenetics of schizophrenia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.575 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GABRB1	NM_000812.4	c.544+18669A>G		intron_variant		ENST00000295454.8
GABRB1	XM_024453976.2	c.445+18669A>G		intron_variant
GABRB1	XM_024453977.2	c.445+18669A>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GABRB1	ENST00000295454.8	c.544+18669A>G		intron_variant		1	NM_000812.4	P1
GABRB1	ENST00000510909.1	c.*212+18669A>G		intron_variant, NMD_transcript_variant		4

Frequencies

GnomAD3 genomes AF: 0.437 AC: 66360 AN: 151924 Hom.: 14951 Cov.: 32

Gnomad AFR AF: 0.543

Gnomad AMI AF: 0.295

Gnomad AMR AF: 0.459

Gnomad ASJ AF: 0.433

Gnomad EAS AF: 0.592

Gnomad SAS AF: 0.415

Gnomad FIN AF: 0.434

Gnomad MID AF: 0.383

Gnomad NFE AF: 0.360

Gnomad OTH AF: 0.419

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.437 AC: 66422 AN: 152040 Hom.: 14975 Cov.: 32 AF XY: 0.441 AC XY: 32790 AN XY: 74320

Gnomad4 AFR AF: 0.543

Gnomad4 AMR AF: 0.459

Gnomad4 ASJ AF: 0.433

Gnomad4 EAS AF: 0.593

Gnomad4 SAS AF: 0.414

Gnomad4 FIN AF: 0.434

Gnomad4 NFE AF: 0.360

Gnomad4 OTH AF: 0.421

Alfa AF: 0.385 Hom.: 4819

Bravo AF: 0.450

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	1.6
DANN	Benign	0.59

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: rs9996854; hg19: chr4-47340895;