NM_016379.4:c.520C>G

Variant names:

• chrX-6533786-G-C
• rs1921747169
• NM_016379.4:c.520C>G

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_016379.4(VCX3A):​c.520C>G​(p.Leu174Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L174M) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 18)
  • Exomes 𝑓: 9.7e-7 (0 hom. 0 hem.)
  • Failed GnomAD Quality Control
• Consequence: VCX3A NM_016379.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.353
• Publications: 0 publications found

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

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.07466927).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016379.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	VCX3A	NM_016379.4	MANE Select	c.520C>G	p.Leu174Val	missense	Exon 3 of 3	NP_057463.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	VCX3A	ENST00000381089.7	TSL:1 MANE Select	c.520C>G	p.Leu174Val	missense	Exon 3 of 3	ENSP00000370479.3	Q9NNX9
	VCX3A	ENST00000898738.1		c.520C>G	p.Leu174Val	missense	Exon 2 of 2	ENSP00000568797.1
	VCX3A	ENST00000398729.1	TSL:5	c.460C>G	p.Leu154Val	missense	Exon 4 of 4	ENSP00000381713.1	E7ESE9

Frequencies

GnomAD3 genomes Cov.: 18

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 9.74e-7 AC: 1 AN: 1027138 Hom.: 0 Cov.: 40 AF XY: 0.00 AC XY: 0 AN XY: 340542

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 25710

American (AMR) AF: 0.00 AC: 0 AN: 32058

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 17654

East Asian (EAS) AF: 0.00 AC: 0 AN: 27577

South Asian (SAS) AF: 0.00 AC: 0 AN: 48842

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 36112

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3135

European-Non Finnish (NFE) AF: 0.00000126 AC: 1 AN: 793453

Other (OTH) AF: 0.00 AC: 0 AN: 42597

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 18

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ExAC AF: 0.00000841 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.090
BayesDel_addAF	Benign	-0.42	T
BayesDel_noAF	Benign	-0.84
CADD	Benign	13
DANN	Benign	0.19
DEOGEN2	Benign	0.0045	T
FATHMM_MKL	Benign	0.0016	N
LIST_S2	Benign	0.43	T
M_CAP	Benign	0.00076	T
MetaRNN	Benign	0.075	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	M
PhyloP100		-0.35
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.40	N
REVEL	Benign	0.069
Sift	Benign	0.38	T
Sift4G	Benign	1.0	T
Polyphen		0.74	P
Vest4		0.058
MutPred		0.26		Gain of sheet (P = 0.1945)
MVP		0.043
MPC		0.27
ClinPred		0.28	T
GERP RS		-1.2
Varity_R		0.090
gMVP		0.0018
Mutation Taster		=98/2	polymorphism

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

Other links and lift over

dbSNP: rs1921747169; hg19: chrX-6451827;