X-21432806-G-A

Position:

• chrX-21432806-G-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_014927.5(CNKSR2):​c.423G>A​(p.Trp141*) variant causes a stop gained change involving the alteration of a conserved nucleotide. 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 (★). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 23)
• Consequence: CNKSR2 NM_014927.5 stop_gained
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.41

Genes affected

CNKSR2 (HGNC:19701): (connector enhancer of kinase suppressor of Ras 2) This gene encodes a multidomain protein that functions as a scaffold protein to mediate the mitogen-activated protein kinase pathways downstream from Ras. This gene product is induced by vitamin D and inhibits apoptosis in certain cancer cells. It may also play a role in ternary complex assembly of synaptic proteins at the postsynaptic membrane and coupling of signal transduction to membrane/cytoskeletal remodeling. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2009]

CNKSR2 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-21432806-G-A is Pathogenic according to our data. Variant chrX-21432806-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 3376274.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNKSR2	NM_014927.5	c.423G>A	p.Trp141*	stop_gained	3/22	ENST00000379510.5	NP_055742.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNKSR2	ENST00000379510.5	c.423G>A	p.Trp141*	stop_gained	3/22	1	NM_014927.5	ENSP00000368824.3

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 23

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, X-linked, syndromic, Houge type Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Pittsburgh Clinical Genomics Laboratory, University of Pittsburgh Medical Center

Aug 11, 2023

This sequence variant is a single nucleotide substitution (G>A) at coding position 423 of the CNKSR2 gene which changes the Trp141 codon to an early termition sigl. As it occurs in exon 3 of 23, this variant is predicted to generate a non-functiol allele through either the expression of a truncated protein or a loss of CNKSR2 expression due to nonsense-mediated decay. This novel variant is absent from ClinVar, medical publications, and the gnomAD population database (0/~177000 alleles). Haploinsufficiency in CNKSR2 is a known mechanism of disease. Based upon the evidence, we consider this variant to be pathogenic. ACMG Criteria: PM2, PS2, PVS1 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	37
DANN	Uncertain	0.99
FATHMM_MKL	Pathogenic	0.99	D
Vest4		0.50, 0.51, 0.55, 0.51
GERP RS		5.0

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-21450924;