X-74743593-G-A

Position:

• chrX-74743593-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_001008537.3(NEXMIF):​c.964C>T​(p.Arg322Ter) variant causes a stop gained change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 23)
• Consequence: NEXMIF NM_001008537.3 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 3.98

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 Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. Fraction of 0.788 CDS is truncated, and there are 0 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-74743593-G-A is Pathogenic according to our data. Variant chrX-74743593-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 438478.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-74743593-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NEXMIF	NM_001008537.3	c.964C>T	p.Arg322Ter	stop_gained	3/4	ENST00000055682.12	NP_001008537.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NEXMIF	ENST00000055682.12	c.964C>T	p.Arg322Ter	stop_gained	3/4	1	NM_001008537.3	ENSP00000055682	P1
NEXMIF	ENST00000616200.2	c.964C>T	p.Arg322Ter	stop_gained	3/5	1		ENSP00000480284	P1
NEXMIF	ENST00000642681.2	c.964C>T	p.Arg322Ter	stop_gained	3/3			ENSP00000495800

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Oct 27, 2021	Nonsense variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss-of-function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (Lek et al., 2016); This variant is associated with the following publications: (PMID: 25900396, 27812264, 26576034, 27358180) -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jun 03, 2023	For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 438478). This premature translational stop signal has been observed in individual(s) with clinical features of NEXMIF-related conditions (PMID: 25900396, 26576034). In at least one individual the variant was observed to be de novo. This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Arg322*) in the NEXMIF gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in NEXMIF are known to be pathogenic (PMID: 23615299). -

X-linked intellectual disability, Cantagrel type Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Aug 20, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.62
CADD	Pathogenic	34
DANN	Uncertain	1.0
FATHMM_MKL	Uncertain	0.91	D
MutationTaster	Benign	1.0	A;A
Vest4		0.45
GERP RS		5.8

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

LitVar

Other links and lift over

dbSNP: rs1556016731; hg19: chrX-73963428; COSMIC: COSV50023631; COSMIC: COSV50023631;