X-6533840-G-T

Position:

• chrX-6533840-G-T

Variant summary

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

The NM_016379.4(VCX3A):​c.466C>A​(p.Gln156Lys) 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 (★).

• Frequency: Genomes: not found (cov: 17)
• Consequence: VCX3A NM_016379.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.48

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=0.07410696).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VCX3A	NM_016379.4	c.466C>A	p.Gln156Lys	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.466C>A	p.Gln156Lys	missense_variant	3/3	1	NM_016379.4	ENSP00000370479	P2
VCX3A	ENST00000398729.1	c.406C>A	p.Gln136Lys	missense_variant	4/4	5		ENSP00000381713	A2

Frequencies

GnomAD3 genomes Cov.: 17

GnomAD4 exome Cov.: 45

GnomAD4 genome Cov.: 17

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

May 20, 2024

The c.466C>A (p.Q156K) alteration is located in exon 3 (coding exon 2) of the VCX3A gene. This alteration results from a C to A substitution at nucleotide position 466, causing the glutamine (Q) at amino acid position 156 to be replaced by a lysine (K). 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	-0.43	T
BayesDel_noAF	Benign	-0.85
CADD	Benign	1.3
DANN	Benign	0.36
DEOGEN2	Benign	0.0046	T;.
FATHMM_MKL	Benign	0.0017	N
LIST_S2	Benign	0.64	T;T
M_CAP	Benign	0.00065	T
MetaRNN	Benign	0.074	T;T
MetaSVM	Benign	-0.96	T
MutationAssessor	Uncertain	2.2	M;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.40	N;N
REVEL	Benign	0.019
Sift	Benign	0.099	T;D
Sift4G	Benign	0.13	T;T
Polyphen		0.0020	B;.
Vest4		0.13
MutPred		0.25		Gain of ubiquitination at Q156 (P = 0.0077);.;
MVP		0.043
MPC		0.34
ClinPred		0.068	T
GERP RS		-1.0
Varity_R		0.19
gMVP		0.0051

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-6451881;