chr14-66508553-C-T

Position:

• chr14-66508553-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_020806.5(GPHN):​c.26C>T​(p.Thr9Ile) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,770 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T9S) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: GPHN NM_020806.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.94

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.26199076).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GPHN	NM_020806.5	c.26C>T	p.Thr9Ile	missense_variant	1/23	ENST00000478722.6	NP_065857.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GPHN	ENST00000478722.6	c.26C>T	p.Thr9Ile	missense_variant	1/23	1	NM_020806.5	ENSP00000417901

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461770 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 727200

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.80
BayesDel_addAF	Uncertain	0.074	D
BayesDel_noAF	Benign	-0.13
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Benign	0.32	T;.;.;T
Eigen	Benign	0.13
Eigen_PC	Uncertain	0.25
FATHMM_MKL	Benign	0.56	D
LIST_S2	Uncertain	0.97	D;D;D;D
M_CAP	Uncertain	0.28	D
MetaRNN	Benign	0.26	T;T;T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.0	L;L;.;.
MutationTaster	Benign	0.98	D;D;D;D;D
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-1.7	N;N;N;N
REVEL	Benign	0.19
Sift	Uncertain	0.0050	D;D;D;D
Sift4G	Uncertain	0.016	D;D;D;D
Polyphen		0.0080	B;P;D;D
Vest4		0.29
MutPred		0.47		Gain of catalytic residue at D12 (P = 0);Gain of catalytic residue at D12 (P = 0);Gain of catalytic residue at D12 (P = 0);Gain of catalytic residue at D12 (P = 0);
MVP		0.32
MPC		1.3
ClinPred		0.95	D
GERP RS		4.3
Varity_R		0.22
gMVP		0.61

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: rs150226537; hg19: chr14-66975271;