chrX-119541341-C-T

Position:

• chrX-119541341-C-T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4 BS2

The NM_022101.4(STEEP1):​c.593G>A​(p.Arg198Gln) variant causes a missense change. The variant allele was found at a frequency of 0.00000931 in 1,074,350 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 5 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: 23)
  • Exomes 𝑓: 0.0000093 (0 hom. 5 hem.)
• Consequence: STEEP1 NM_022101.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.15

Genes affected

STEEP1 (HGNC:26239): (STING1 ER exit protein 1) While this gene is well-supported by transcript data, no functional information on its protein products is currently available. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2009]

UBE2A (HGNC:12472): (ubiquitin conjugating enzyme E2 A) The modification of proteins with ubiquitin is an important cellular mechanism for targeting abnormal or short-lived proteins for degradation. Ubiquitination involves at least three classes of enzymes: ubiquitin-activating enzymes, ubiquitin-conjugating enzymes, and ubiquitin-protein ligases. This gene encodes a member of the E2 ubiquitin-conjugating enzyme family. This enzyme is required for post-replicative DNA damage repair, and may play a role in transcriptional regulation. Mutations in this gene are associated with cognitive disability. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2013]

STEEP1 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -5 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.3134222).
• BS2: High Hemizygotes in GnomAdExome4 at 5 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STEEP1	NM_022101.4	c.593G>A	p.Arg198Gln	missense_variant	6/7	ENST00000644802.2	NP_071384.1
STEEP1	NM_001170570.2	c.551G>A	p.Arg184Gln	missense_variant	5/6		NP_001164041.1
STEEP1	NM_001170569.1	c.446G>A	p.Arg149Gln	missense_variant	6/7		NP_001164040.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STEEP1	ENST00000644802.2	c.593G>A	p.Arg198Gln	missense_variant	6/7		NM_022101.4	ENSP00000494123.2

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD3 exomes AF: 0.00000550 AC: 1 AN: 181935 Hom.: 0 AF XY: 0.0000150 AC XY: 1 AN XY: 66485

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.0000122

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000931 AC: 10 AN: 1074350 Hom.: 0 Cov.: 25 AF XY: 0.0000146 AC XY: 5 AN XY: 343310

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: 0.0000122

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 23

ExAC AF: 0.0000165 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, X-linked 107 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Jul 17, 2023

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as VUS-3B. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with intellectual developmental disorder, X-linked 107 (MIM#301013). (I) 0109 - This gene is associated with X-linked recessive disease. Carrier females may be asymptomatic due to skewed X-inactivation or mildly affected (PMID: 29374277; PMID: 31822863). (I) 0200 - Variant is predicted to result in a missense amino acid change from arginine to glutamine. (I) 0253 - This variant is hemizygous. (I) 0304 - Variant is present in gnomAD (v2) <0.01 for a recessive condition (0 heterozygotes, 0 homozygotes, 1 hemizygote). (SP) 0502 - Missense variant with conflicting in silico predictions and uninformative conservation. (I) 0603 - Missense variant in a region that is highly intolerant to missense variation (high constraint region in DECIPHER). (SP) 0705 - No comparable missense variants have previous evidence for pathogenicity. (I) 0807 - This variant has no previous evidence of pathogenicity. (I) 0905 - No published segregation evidence has been identified for this variant. (I) 1007 - No published functional evidence has been identified for this variant. (I) 1208 - Inheritance information for this variant is not currently available in this individual. (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.78
BayesDel_addAF	Benign	-0.030	T
BayesDel_noAF	Benign	-0.28
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.12	.;.;T
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.88	D;D;D
M_CAP	Pathogenic	0.36	D
MetaRNN	Benign	0.31	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.60	.;.;N
PROVEAN	Benign	-0.85	N;N;.
REVEL	Benign	0.17
Sift	Benign	0.12	T;T;.
Sift4G	Benign	0.42	T;T;.
Polyphen		1.0	.;.;D
Vest4		0.62
MutPred		0.26		.;.;Loss of MoRF binding (P = 0.0463);
MVP		0.58
ClinPred		0.78	D
GERP RS		5.6
Varity_R		0.43
gMVP		0.91

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: rs748616501; hg19: chrX-118675304;