X-68048441-G-A

Position:

• chrX-68048441-G-A

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_002547.3(OPHN1):​c.2392C>T​(p.Pro798Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000821 in 1,096,754 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 6 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: not found (cov: 22)
  • Exomes 𝑓: 0.0000082 (0 hom. 6 hem.)
• Consequence: OPHN1 NM_002547.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 2.67

Genes affected

OPHN1 (HGNC:8148): (oligophrenin 1) This gene encodes a Rho-GTPase-activating protein that promotes GTP hydrolysis of Rho subfamily members. Rho proteins are important mediators of intracellular signal transduction, which affects cell migration and cell morphogenesis. Mutations in this gene are responsible for OPHN1-related X-linked cognitive disability with cerebellar hypoplasia and distinctive facial dysmorhphism. [provided by RefSeq, Jul 2008]

OPHN1 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.079868406).
• BS2: High Hemizygotes in GnomAdExome4 at 6 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
OPHN1	NM_002547.3	c.2392C>T	p.Pro798Ser	missense_variant	24/25	ENST00000355520.6	NP_002538.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
OPHN1	ENST00000355520.6	c.2392C>T	p.Pro798Ser	missense_variant	24/25	1	NM_002547.3	ENSP00000347710.5

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome AF: 0.00000821 AC: 9 AN: 1096754 Hom.: 0 Cov.: 28 AF XY: 0.0000166 AC XY: 6 AN XY: 362182

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: 0.0000185

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000832

Gnomad4 OTH exome AF: 0.0000217

GnomAD4 genome Cov.: 22

EpiCase AF: 0.00

EpiControl AF: 0.0000594

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 12, 2023

The c.2392C>T (p.P798S) alteration is located in exon 24 (coding exon 23) of the OPHN1 gene. This alteration results from a C to T substitution at nucleotide position 2392, causing the proline (P) at amino acid position 798 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

OPHN1-related disorder Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Jan 10, 2023

The OPHN1 c.2392C>T variant is predicted to result in the amino acid substitution p.Pro798Ser. To our knowledge, this variant has not been reported in the literature or in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.071
BayesDel_addAF	Benign	-0.33	T
BayesDel_noAF	Benign	-0.71
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.057	T
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.79	T
M_CAP	Uncertain	0.10	D
MetaRNN	Benign	0.080	T
MetaSVM	Benign	-0.99	T
MutationAssessor	Benign	1.4	L
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	1.1	N
REVEL	Benign	0.066
Sift	Pathogenic	0.0	D
Sift4G	Benign	0.35	T
Polyphen		0.075	B
Vest4		0.13
MutPred		0.24		Gain of phosphorylation at P798 (P = 0.002);
MVP		0.29
MPC		0.12
ClinPred		0.81	D
GERP RS		2.7
Varity_R		0.13
gMVP		0.29

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.19		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: chrX-67268283;