chr1-2024957-C-G

Variant names:

• chr1-2024957-C-G
• rs769857211
• NM_000815.5:c.84C>G

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.84C>G​(p.Ile28Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,459,906 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. Synonymous variant affecting the same amino acid position (i.e. I28I) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GABRD NM_000815.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.470
• 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: Ambry Genetics, Labcorp Genetics (formerly Invitae)

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=0.23216441).

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRD	NM_000815.5	MANE Select	c.84C>G	p.Ile28Met	missense	Exon 2 of 9	NP_000806.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GABRD	ENST00000378585.7	TSL:1 MANE Select	c.84C>G	p.Ile28Met	missense	Exon 2 of 9	ENSP00000367848.4
	GABRD	ENST00000638771.1	TSL:3	c.84C>G	p.Ile28Met	missense	Exon 2 of 8	ENSP00000492435.1
	GABRD	ENST00000640067.1	TSL:5	c.84C>G	p.Ile28Met	missense	Exon 2 of 9	ENSP00000491844.1

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1459906 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726320

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 33460

American (AMR) AF: 0.00 AC: 0 AN: 44696

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39684

South Asian (SAS) AF: 0.00 AC: 0 AN: 86240

European-Finnish (FIN) AF: 0.0000191 AC: 1 AN: 52410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1111226

Other (OTH) AF: 0.00 AC: 0 AN: 60322

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Uncertain	0.016	T
BayesDel_noAF	Benign	-0.22
CADD	Benign	11
DANN	Uncertain	0.98
DEOGEN2	Benign	0.20	T
Eigen	Benign	-0.98
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.071	N
LIST_S2	Uncertain	0.93	D
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.46	T
MutationAssessor	Benign	0.81	L
PhyloP100		-0.47
PrimateAI	Pathogenic	0.86	D
PROVEAN	Benign	-0.54	N
REVEL	Uncertain	0.45
Sift	Uncertain	0.013	D
Sift4G	Benign	0.11	T
Polyphen		0.99	D
Vest4		0.49
MutPred		0.45		Gain of helix (P = 0.0225)
MVP		0.54
MPC		1.6
ClinPred		0.97	D
GERP RS		-4.2
PromoterAI		-0.0092	Neutral
Varity_R		0.089
gMVP		0.66
Mutation Taster		=78/22	polymorphism

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

Other links and lift over

dbSNP: rs769857211; hg19: chr1-1956396;