rs117256383

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_StrongBP6

The NM_020806.5(GPHN):c.127G>A(p.Val43Ile) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000612 in 1,585,324 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V43L) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000059 ( 0 hom. )

Consequence

GPHN
NM_020806.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 7.38

Publications

12 publications found

Variant links:

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 Gene-Disease associations (from GenCC):

sulfite oxidase deficiency due to molybdenum cofactor deficiency type C
Inheritance: AR Classification: STRONG, MODERATE, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics, ClinGen
hereditary hyperekplexia
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
complex neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

GPHN links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.053344876).

BP6

Variant 14-66681169-G-A is Benign according to our data. Variant chr14-66681169-G-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 566679.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPHN	NM_020806.5 link	c.127G>A	p.Val43Ile	missense_variant	Exon 2 of 23	ENST00000478722.6	NP_065857.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPHN	ENST00000478722.6 link	c.127G>A	p.Val43Ile	missense_variant	Exon 2 of 23	1	NM_020806.5	ENSP00000417901.1

Frequencies

GnomAD3 genomes

AF:

0.0000789

AC:

AN:

152040

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000393

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000441

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000116

AC:

AN:

250762

AF XY:

0.000118

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000434

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000882

Gnomad OTH exome

AF:

0.000164

GnomAD4 exome

AF:

0.0000593

AC:

AN:

1433166

Hom.:

Cov.:

AF XY:

0.0000574

AC XY:

AN XY:

714850

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32786

American (AMR)

AF:

0.000448

AC:

AN:

44690

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25956

East Asian (EAS)

AF:

0.00

AC:

AN:

39426

South Asian (SAS)

AF:

0.0000351

AC:

AN:

85550

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53104

Middle Eastern (MID)

AF:

0.000202

AC:

AN:

4946

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

1087312

Other (OTH)

AF:

0.000219

AC:

AN:

59396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.460

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000789

AC:

AN:

152158

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74390

show subpopulations

African (AFR)

AF:

0.0000482

AC:

AN:

41530

American (AMR)

AF:

0.000392

AC:

AN:

15290

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3468

East Asian (EAS)

AF:

0.00

AC:

AN:

5194

South Asian (SAS)

AF:

0.00

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10576

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

67964

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.513

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000117

Hom.:

Bravo

AF:

0.000102

ExAC

AF:

0.0000906

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.000119

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Sulfite oxidase deficiency due to molybdenum cofactor deficiency type C

Uncertain:1Benign:1

Sep 20, 2024

3billion

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The homozygous variant was found in patients diagnosed with another variant in a different gene, with no symptoms related to the gene containing the homozygous variant. -

Jan 12, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces valine, which is neutral and non-polar, with isoleucine, which is neutral and non-polar, at codon 43 of the GPHN protein (p.Val43Ile). This variant is present in population databases (rs117256383, gnomAD 0.05%). This missense change has been observed in individual(s) with juvenile myoclonic epilepsy with generalized tonic-clonic seizures (PMID: 29948376). ClinVar contains an entry for this variant (Variation ID: 566679). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt GPHN protein function with a negative predictive value of 80%. 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. -

Sulfite oxidase deficiency due to molybdenum cofactor deficiency type C;C4551954:Hyperekplexia 1

Uncertain:1

Jul 13, 2021

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Nov 10, 2023

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 29948376) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.093

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.30

CADD

Uncertain

(source)

DANN

Benign

0.96

DEOGEN2

Benign

0.33

T;.;.;T

Eigen

Benign

-0.22

Eigen_PC

Benign

0.037

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.87

D;D;D;D

M_CAP

Benign

0.023

MetaRNN

Benign

0.053

T;T;T;T

MetaSVM

Benign

-0.82

MutationAssessor

Benign

-0.25

N;N;.;.

PhyloP100

7.4

PrimateAI

Uncertain

0.61

PROVEAN

Benign

-0.040

N;N;N;N

REVEL

Benign

0.26

Sift

Benign

1.0

T;T;T;T

Sift4G

Benign

1.0

T;T;T;T

Polyphen

0.0010

B;B;B;B

Vest4

0.35

MutPred

0.49

Gain of catalytic residue at L48 (P = 0);Gain of catalytic residue at L48 (P = 0);Gain of catalytic residue at L48 (P = 0);Gain of catalytic residue at L48 (P = 0);

MVP

0.51

MPC

0.53

ClinPred

0.039

GERP RS

5.1

Varity_R

0.16

gMVP

0.64

Mutation Taster

=90/10

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over