chrX-47198899-G-A

Position:

• chrX-47198899-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_003334.4(UBA1):​c.97G>A​(p.Val33Met) variant causes a missense change. The variant allele was found at a frequency of 0.00000889 in 112,438 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.0000089 (0 hom., 1 hem., cov: 24)
• Consequence: UBA1 NM_003334.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.68

Genes affected

UBA1 (HGNC:12469): (ubiquitin like modifier activating enzyme 1) The protein encoded by this gene catalyzes the first step in ubiquitin conjugation to mark cellular proteins for degradation. This gene complements an X-linked mouse temperature-sensitive defect in DNA synthesis, and thus may function in DNA repair. It is part of a gene cluster on chromosome Xp11.23. Alternatively spliced transcript variants that encode the same protein have been described. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), UBA1. . Gene score misZ 3.4752 (greater than the threshold 3.09). GenCC has associacion of gene with infantile-onset X-linked spinal muscular atrophy, inflammatory disease.
• BP4: Computational evidence support a benign effect (MetaRNN=0.16996291).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
UBA1	NM_003334.4	c.97G>A	p.Val33Met	missense_variant	2/26	ENST00000335972.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
UBA1	ENST00000335972.11	c.97G>A	p.Val33Met	missense_variant	2/26	1	NM_003334.4	P1

Frequencies

GnomAD3 genomes AF: 0.00000889 AC: 1 AN: 112438 Hom.: 0 Cov.: 24 AF XY: 0.0000289 AC XY: 1 AN XY: 34596

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.0000188

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.00000889 AC: 1 AN: 112438 Hom.: 0 Cov.: 24 AF XY: 0.0000289 AC XY: 1 AN XY: 34596

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000188

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000142 Hom.: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Infantile-onset X-linked spinal muscular atrophy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2019

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. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with UBA1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces valine with methionine at codon 33 of the UBA1 protein (p.Val33Met). The valine residue is weakly conserved and there is a small physicochemical difference between valine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.083
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.052	T;.;T;T;T;T;.
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.74	T;T;T;T;T;.;T
M_CAP	Pathogenic	0.54	D
MetaRNN	Benign	0.17	T;T;T;T;T;T;T
MetaSVM	Benign	-0.75	T
MutationAssessor	Benign	0.90	L;.;.;.;.;L;.
MutationTaster	Benign	0.89	N;N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	0.11	N;N;N;N;N;N;N
REVEL	Benign	0.069
Sift	Benign	0.28	T;T;T;T;T;T;T
Sift4G	Benign	0.13	T;T;T;T;T;T;T
Polyphen		0.0010	B;.;.;.;.;B;.
Vest4		0.23
MutPred		0.13		Gain of catalytic residue at V29 (P = 0.0228);Gain of catalytic residue at V29 (P = 0.0228);.;.;.;Gain of catalytic residue at V29 (P = 0.0228);.;
MVP		0.73
MPC		0.46
ClinPred		0.39	T
GERP RS		4.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.084
gMVP		0.38

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: rs1449173671; hg19: chrX-47058298;