5-162102565-A-T

Variant names:

• chr5-162102565-A-T
• ENST00000414552.6:c.643A>T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 5P and 2B. PM1 PM2 PP2 BP4_Moderate

The NM_198903.2(GABRG2):​c.643A>T​(p.Ile215Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000331 in 302,036 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/18 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000033 (0 hom.)
• Consequence: GABRG2 NM_198903.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.00

Genes affected

GABRG2 (HGNC:4087): (gamma-aminobutyric acid type A receptor subunit gamma2) This gene encodes a gamma-aminobutyric acid (GABA) receptor. GABA is the major inhibitory neurotransmitter in the mammlian brain, where it acts at GABA-A receptors, which are ligand-gated chloride channels. GABA-A receptors are pentameric, consisting of proteins from several subunit classes: alpha, beta, gamma, delta and rho. Mutations in this gene have been associated with epilepsy and febrile seizures. Multiple transcript variants encoding different isoforms have been identified for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a topological_domain Extracellular (size 233) in uniprot entity GBRG2_HUMAN there are 9 pathogenic changes around while only 3 benign (75%) in NM_198903.2
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the GABRG2 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 34 curated pathogenic missense variants (we use a threshold of 10). The gene has 21 curated benign missense variants. Gene score misZ: 2.9939 (below the threshold of 3.09). Trascript score misZ: 3.9088 (above the threshold of 3.09). GenCC associations: The gene is linked to epilepsy, Dravet syndrome, undetermined early-onset epileptic encephalopathy, generalized epilepsy with febrile seizures plus, developmental and epileptic encephalopathy, 74, febrile seizures, familial, 8, childhood epilepsy with centrotemporal spikes.
• BP4: Computational evidence support a benign effect (MetaRNN=0.093057215).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GABRG2	NM_198904.4	c.631+1248A>T		intron_variant	Intron 5 of 9	ENST00000639213.2	NP_944494.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GABRG2	ENST00000639213.2	c.631+1248A>T		intron_variant	Intron 5 of 9	1	NM_198904.4	ENSP00000491909.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000331 AC: 1 AN: 302036 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 172116

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000629

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.84
CADD	Benign	1.5
DANN	Benign	0.40
Eigen	Benign	-1.4
Eigen_PC	Benign	-1.6
FATHMM_MKL	Benign	0.00082	N
LIST_S2	Benign	0.31	T;T
M_CAP	Benign	0.0050	T
MetaRNN	Benign	0.093	T;T
MetaSVM	Benign	-0.98	T
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-0.17	N;.
REVEL	Benign	0.039
Sift	Benign	0.086	T;.
Sift4G	Benign	0.33	T;.
Vest4		0.099
MutPred		0.55		Loss of sheet (P = 0.0817);Loss of sheet (P = 0.0817);
MVP		0.17
MPC		1.9
ClinPred		0.046	T
GERP RS		0.23
gMVP		0.42

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr5-161529571;