14-67143444-G-A

Position:

• chr14-67143444-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_020806.5(GPHN):​c.1831G>A​(p.Glu611Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000354 in 1,412,006 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000035 (0 hom.)
• Consequence: GPHN NM_020806.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:2
• Conservation: PhyloP100: 9.60

Genes affected

GPHN (HGNC:15465): (gephyrin) This gene encodes a neuronal assembly protein that anchors inhibitory neurotransmitter receptors to the postsynaptic cytoskeleton via high affinity binding to a receptor subunit domain and tubulin dimers. In nonneuronal tissues, the encoded protein is also required for molybdenum cofactor biosynthesis. Mutations in this gene may be associated with the neurological condition hyperplexia and also lead to molybdenum cofactor deficiency. Numerous alternatively spliced transcript variants encoding different isoforms have been described; however, the full-length nature of all transcript variants is not currently known. [provided by RefSeq, Jul 2008]

GPHN (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.801

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GPHN	NM_020806.5	c.1831G>A	p.Glu611Lys	missense_variant	18/23	ENST00000478722.6	NP_065857.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GPHN	ENST00000478722.6	c.1831G>A	p.Glu611Lys	missense_variant	18/23	1	NM_020806.5	ENSP00000417901.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD3 exomes AF: 0.00000796 AC: 2 AN: 251216 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 135760

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000354 AC: 5 AN: 1412006 Hom.: 0 Cov.: 24 AF XY: 0.00000283 AC XY: 2 AN XY: 705584

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000448

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000254

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.38e-7

Gnomad4 OTH exome AF: 0.0000170

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, single submitter

Submissions by phenotype

Sulfite oxidase deficiency due to molybdenum cofactor deficiency type C Uncertain:2

Uncertain significance, no assertion criteria provided	research	Division of Human Genetics, Children's Hospital of Philadelphia	Apr 14, 2016	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 27, 2022	In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GPHN protein function. ClinVar contains an entry for this variant (Variation ID: 417881). This variant has not been reported in the literature in individuals affected with GPHN-related conditions. This variant is present in population databases (no rsID available, gnomAD 0.006%). This sequence change replaces glutamic acid, which is acidic and polar, with lysine, which is basic and polar, at codon 611 of the GPHN protein (p.Glu611Lys). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Pathogenic	0.23
CADD	Pathogenic	32
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.83	D;.;D;D
Eigen	Uncertain	0.65
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D;D;D;D
M_CAP	Benign	0.064	D
MetaRNN	Pathogenic	0.80	D;D;D;D
MetaSVM	Uncertain	0.047	D
MutationAssessor	Benign	1.9	L;.;.;.
PrimateAI	Pathogenic	0.87	D
PROVEAN	Uncertain	-3.0	D;D;D;D
REVEL	Pathogenic	0.73
Sift	Uncertain	0.0040	D;D;D;D
Sift4G	Uncertain	0.010	D;D;D;D
Polyphen		0.95	P;P;B;.
Vest4		0.81
MutPred		0.59		.;.;Gain of catalytic residue at S621 (P = 0);.;
MVP		0.89
MPC		1.5
ClinPred		0.80	D
GERP RS		5.9
Varity_R		0.74
gMVP		0.86

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: rs1060499577; hg19: chr14-67610161; COSMIC: COSV59474444;