X-6533804-T-C

Position:

• chrX-6533804-T-C

Variant summary

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

The ENST00000381089.7(VCX3A):​c.502A>G​(p.Ser168Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S168N) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 18)
• Consequence: VCX3A ENST00000381089.7 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -4.47

Genes affected

VCX3A (HGNC:18159): (variable charge X-linked 3A) This gene belongs to the VCX/Y gene family, which has multiple members on both X and Y chromosomes, and all are expressed exclusively in male germ cells. The X-linked members are clustered on chromosome Xp22 and Y-linked members are two identical copies of the gene within a palindromic region on Yq11. The family members share a high degree of sequence identity, with the exception that a 30-bp unit is tandemly repeated in X-linked members but occurs only once in Y-linked members. The VCX gene cluster is polymorphic in terms of copy number; different individuals may have a different number of VCX genes. VCX/Y genes encode small and highly charged proteins of unknown function. The presence of a putative bipartite nuclear localization signal suggests that VCX/Y members are nuclear proteins. This gene contains 8 repeats of the 30-bp unit. [provided by RefSeq, Jul 2008]

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=0.0696992).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VCX3A	NM_016379.4	c.502A>G	p.Ser168Gly	missense_variant	3/3	ENST00000381089.7	NP_057463.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VCX3A	ENST00000381089.7	c.502A>G	p.Ser168Gly	missense_variant	3/3	1	NM_016379.4	ENSP00000370479.3
VCX3A	ENST00000398729.1	c.442A>G	p.Ser148Gly	missense_variant	4/4	5		ENSP00000381713.1

Frequencies

GnomAD3 genomes Cov.: 18

GnomAD4 exome Cov.: 42

GnomAD4 genome Cov.: 18

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 10, 2023

The c.502A>G (p.S168G) alteration is located in exon 3 (coding exon 2) of the VCX3A gene. This alteration results from a A to G substitution at nucleotide position 502, causing the serine (S) at amino acid position 168 to be replaced by a glycine (G). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.45	T
BayesDel_noAF	Benign	-0.88
CADD	Benign	10
DANN	Benign	0.57
DEOGEN2	Benign	0.0040	T;.
FATHMM_MKL	Benign	0.00092	N
LIST_S2	Benign	0.41	T;T
M_CAP	Benign	0.00073	T
MetaRNN	Benign	0.070	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.48	T
PROVEAN	Benign	-0.59	N;N
REVEL	Benign	0.016
Sift	Benign	0.098	T;D
Sift4G	Uncertain	0.052	T;D
Polyphen		0.48	P;.
Vest4		0.054
MutPred		0.24		Loss of phosphorylation at S168 (P = 0.0013);.;
MVP		0.043
MPC		0.25
ClinPred		0.23	T
GERP RS		0.59
Varity_R		0.18
gMVP		0.0021

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-6451845;