X-74739454-A-T

Position:

• chrX-74739454-A-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001008537.3(NEXMIF):​c.4502T>A​(p.Val1501Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000919 in 1,088,720 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 21)
  • Exomes 𝑓: 9.2e-7 (0 hom. 0 hem.)
• Consequence: NEXMIF NM_001008537.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.26

Genes affected

NEXMIF (HGNC:29433): (neurite extension and migration factor) An inversion on the X chromosome which disrupts this gene and a G-protein coupled purinergic receptor gene located in the pseudoautosomal region of the X chromosome has been linked to X linked cognitive disability.[provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.32918042).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEXMIF	NM_001008537.3	c.4502T>A	p.Val1501Asp	missense_variant	4/4	ENST00000055682.12	NP_001008537.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEXMIF	ENST00000055682.12	c.4502T>A	p.Val1501Asp	missense_variant	4/4	1	NM_001008537.3	ENSP00000055682	P1
NEXMIF	ENST00000616200.2	c.4502T>A	p.Val1501Asp	missense_variant	4/5	1		ENSP00000480284	P1
NEXMIF	ENST00000642681.2	c.*642T>A		3_prime_UTR_variant	3/3			ENSP00000495800

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome AF: 9.19e-7 AC: 1 AN: 1088720 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 355796

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000301

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 21

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 10, 2023

This sequence change replaces valine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 1501 of the NEXMIF protein (p.Val1501Asp). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with NEXMIF-related conditions. ClinVar contains an entry for this variant (Variation ID: 1000544). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available". The aspartic acid amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.22
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Uncertain	-0.020
CADD	Uncertain	23
DANN	Uncertain	0.98
DEOGEN2	Benign	0.083	T;T
FATHMM_MKL	Benign	0.72	D
LIST_S2	Benign	0.79	.;T
M_CAP	Benign	0.038	D
MetaRNN	Benign	0.33	T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.56	N;.
REVEL	Benign	0.23
Sift	Pathogenic	0.0	D;.
Sift4G	Uncertain	0.0030	D;D
Polyphen		0.023	B;B
Vest4		0.63
MutPred		0.32		Loss of stability (P = 0.1262);Loss of stability (P = 0.1262);
MVP		0.82
MPC		1.0
ClinPred		0.86	D
GERP RS		2.7
Varity_R		0.78
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs2080094736; hg19: chrX-73959289;