chr14-66919011-T-G

Variant names:

• chr14-66919011-T-G
• rs2038398
• NM_020806.5:c.456+2942T>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_020806.5(GPHN):​c.456+2942T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.247 in 152,080 control chromosomes in the GnomAD database, including 9,372 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.25 (9372 hom., cov: 32)
• Consequence: GPHN NM_020806.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.669
• Publications: 3 publications found

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

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.601 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GPHN	NM_020806.5	c.456+2942T>G		intron_variant	Intron 6 of 22	ENST00000478722.6	NP_065857.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GPHN	ENST00000478722.6	c.456+2942T>G		intron_variant	Intron 6 of 22	1	NM_020806.5	ENSP00000417901.1

Frequencies

GnomAD3 genomes AF: 0.247 AC: 37552 AN: 151962 Hom.: 9355 Cov.: 32

Gnomad AFR AF: 0.608

Gnomad AMI AF: 0.00329

Gnomad AMR AF: 0.303

Gnomad ASJ AF: 0.0822

Gnomad EAS AF: 0.454

Gnomad SAS AF: 0.282

Gnomad FIN AF: 0.0826

Gnomad MID AF: 0.114

Gnomad NFE AF: 0.0362

Gnomad OTH AF: 0.225

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.247 AC: 37625 AN: 152080 Hom.: 9372 Cov.: 32 AF XY: 0.252 AC XY: 18730 AN XY: 74364

African (AFR) AF: 0.608 AC: 25153 AN: 41400

American (AMR) AF: 0.303 AC: 4631 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.0822 AC: 285 AN: 3468

East Asian (EAS) AF: 0.454 AC: 2345 AN: 5166

South Asian (SAS) AF: 0.283 AC: 1365 AN: 4826

European-Finnish (FIN) AF: 0.0826 AC: 876 AN: 10610

Middle Eastern (MID) AF: 0.119 AC: 35 AN: 294

European-Non Finnish (NFE) AF: 0.0362 AC: 2459 AN: 68018

Other (OTH) AF: 0.224 AC: 473 AN: 2114

Alfa AF: 0.178 Hom.: 1280

Bravo AF: 0.283

Asia WGS AF: 0.344 AC: 1196 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	6.9
DANN	Benign	0.55
PhyloP100		0.67
Mutation Taster		=100/0	polymorphism (auto)

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: rs2038398; hg19: chr14-67385728;