1-2030137-G-T

Variant names:

• chr1-2030137-G-T
• rs766337060
• NM_000815.5:c.1214G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_000815.5(GABRD):​c.1214G>T​(p.Gly405Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G405E) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GABRD NM_000815.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.71
• Publications: 0 publications found

Genes affected

GABRD (HGNC:4084): (gamma-aminobutyric acid type A receptor subunit delta) Gamma-aminobutyric acid (GABA) is the major inhibitory neurotransmitter in the mammalian brain where it acts at GABA-A receptors, which are ligand-gated chloride channels. Chloride conductance of these channels can be modulated by agents such as benzodiazepines that bind to the GABA-A receptor. The GABA-A receptor is generally pentameric and there are five types of subunits: alpha, beta, gamma, delta, and rho. This gene encodes the delta subunit. Mutations in this gene have been associated with susceptibility to generalized epilepsy with febrile seizures, type 5. Alternatively spliced transcript variants have been described for this gene, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

GABRD Gene-Disease associations (from GenCC):

• complex neurodevelopmental disorder

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics, ClinGen
• epilepsy

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• epilepsy, idiopathic generalized, susceptibility to, 10

  Inheritance: AD Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.110235095).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000815.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRD	NM_000815.5	MANE Select	c.1214G>T	p.Gly405Val	missense	Exon 9 of 9	NP_000806.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRD	ENST00000378585.7	TSL:1 MANE Select	c.1214G>T	p.Gly405Val	missense	Exon 9 of 9	ENSP00000367848.4	O14764
	GABRD	ENST00000640067.1	TSL:5	c.1298G>T	p.Gly433Val	missense	Exon 9 of 9	ENSP00000491844.1	A0A1W2PQR3
	GABRD	ENST00000858706.1		c.1184G>T	p.Gly395Val	missense	Exon 9 of 9	ENSP00000528765.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Idiopathic generalized epilepsy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.076
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	12
DANN	Benign	0.70
DEOGEN2	Benign	0.15	T
Eigen	Benign	-0.84
Eigen_PC	Benign	-0.82
FATHMM_MKL	Uncertain	0.80	D
LIST_S2	Benign	0.76	T
M_CAP	Benign	0.065	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.71	T
MutationAssessor	Benign	0.0	N
PhyloP100		1.7
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-0.54	N
REVEL	Benign	0.20
Sift	Benign	0.12	T
Sift4G	Benign	0.32	T
Polyphen		0.0	B
Vest4		0.12
MutPred		0.44		Gain of MoRF binding (P = 0.0889)
MVP		0.43
MPC		0.94
ClinPred		0.066	T
GERP RS		2.4
Varity_R		0.055
gMVP		0.48
Mutation Taster		=85/15	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs766337060; hg19: chr1-1961576;