chrX-8465809-C-G

Position:

• chrX-8465809-C-G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_001001888.4(VCX3B):​c.167C>G​(p.Ala56Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. 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: 12)
  • Exomes 𝑓: 0.0000030 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: VCX3B NM_001001888.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.163

Genes affected

VCX3B (HGNC:31838): (variable charge X-linked 3B) 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 the Y-linked members are two identical copies of the gene within a palindromic region on chromosome Yq11. The family members share a high degree of sequence identity, with the exception that a 30-nt 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. This family member, as represented by the reference genome allele, contains 14 copies of the 30-nt repeat unit. VCX/Y genes encode small and highly charged proteins containing putative bipartite nuclear localization signals. Although the exact function of this family member has yet to be determined, a role in mRNA stability regulation can be inferred from the ability of the highly similar family member, VCX-A, to inhibit mRNA decapping. A possible role in the regulation of ribosome assembly during spermatogenesis has also been suggested. [provided by RefSeq, Aug 2010]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.08994606).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
VCX3B	NM_001001888.4	c.167C>G	p.Ala56Gly	missense_variant	3/3	ENST00000381032.6	NP_001001888.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
VCX3B	ENST00000381032.6	c.167C>G	p.Ala56Gly	missense_variant	3/3	5	NM_001001888.4	ENSP00000370420	P1

Frequencies

GnomAD3 genomes Cov.: 12

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000302 AC: 3 AN: 992620 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 297992

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: 0.0000203

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000265

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 12

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 26, 2022

The c.167C>G (p.A56G) alteration is located in exon 3 (coding exon 2) of the VCX3B gene. This alteration results from a C to G substitution at nucleotide position 167, causing the alanine (A) at amino acid position 56 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	0.13
BayesDel_addAF	Benign	-0.48	T
BayesDel_noAF	Benign	-0.93
CADD	Benign	3.7
DANN	Benign	0.34
DEOGEN2	Benign	0.0011	.;T;.;.
FATHMM_MKL	Benign	0.0014	N
LIST_S2	Benign	0.48	T;T;T;T
M_CAP	Benign	0.0013	T
MetaRNN	Benign	0.090	T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.2	.;L;.;.
MutationTaster	Benign	1.0	N;N;N;N;N
PrimateAI	Uncertain	0.52	T
PROVEAN	Benign	-1.5	N;N;N;N
REVEL	Benign	0.0030
Sift	Benign	0.29	T;T;T;T
Sift4G	Benign	0.44	T;T;T;T
Polyphen		0.18	.;B;.;.
Vest4		0.21
MutPred		0.28		Loss of helix (P = 0.0041);Loss of helix (P = 0.0041);Loss of helix (P = 0.0041);Loss of helix (P = 0.0041);
MVP		0.081
MPC		0.92
ClinPred		0.051	T
GERP RS		0.38
Varity_R		0.056
gMVP		0.0038

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-8433850;