chr1-22086463-G-A

Variant names:

• chr1-22086463-G-A
• rs1553196096
• NM_001791.4:c.203G>A

Variant summary

Our verdict is Pathogenic. The variant received 15 ACMG points: 15P and 0B. PM1 PM2 PP2 PP3_Moderate PP5_Very_Strong

The NM_001791.4(CDC42):​c.203G>A​(p.Arg68Gln) variant causes a missense 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 (★★). Synonymous variant affecting the same amino acid position (i.e. R68R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDC42 NM_001791.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 7.92
• Publications: 3 publications found

Genes affected

CDC42 (HGNC:1736): (cell division cycle 42) The protein encoded by this gene is a small GTPase of the Rho-subfamily, which regulates signaling pathways that control diverse cellular functions including cell morphology, migration, endocytosis and cell cycle progression. This protein is highly similar to Saccharomyces cerevisiae Cdc 42, and is able to complement the yeast cdc42-1 mutant. The product of oncogene Dbl was reported to specifically catalyze the dissociation of GDP from this protein. This protein could regulate actin polymerization through its direct binding to Neural Wiskott-Aldrich syndrome protein (N-WASP), which subsequently activates Arp2/3 complex. Alternative splicing of this gene results in multiple transcript variants. Pseudogenes of this gene have been identified on chromosomes 3, 4, 5, 7, 8 and 20. [provided by RefSeq, Apr 2013]

CDC42 Gene-Disease associations (from GenCC):

• macrothrombocytopenia-lymphedema-developmental delay-facial dysmorphism-camptodactyly syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: G2P, ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)

ENSG00000289694 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 15 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_001791.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 20 curated pathogenic missense variants (we use a threshold of 10). The gene has 6 curated benign missense variants. Gene score misZ: 3.0373 (below the threshold of 3.09). Trascript score misZ: 2.9016 (below the threshold of 3.09). GenCC associations: The gene is linked to macrothrombocytopenia-lymphedema-developmental delay-facial dysmorphism-camptodactyly syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.887
• PP5: Variant 1-22086463-G-A is Pathogenic according to our data. Variant chr1-22086463-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 450370.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDC42	NM_001791.4	c.203G>A	p.Arg68Gln	missense_variant	Exon 4 of 6	ENST00000656825.1	NP_001782.1
CDC42	NM_001039802.2	c.203G>A	p.Arg68Gln	missense_variant	Exon 5 of 7		NP_001034891.1
CDC42	NM_044472.3	c.203G>A	p.Arg68Gln	missense_variant	Exon 4 of 6		NP_426359.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDC42	ENST00000656825.1	c.203G>A	p.Arg68Gln	missense_variant	Exon 4 of 6		NM_001791.4	ENSP00000499457.1
ENSG00000289694	ENST00000695856.1	c.203G>A	p.Arg68Gln	missense_variant	Exon 4 of 6			ENSP00000512221.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:3

Jul 19, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 68 of the CDC42 protein (p.Arg68Gln). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of CDC42-related conditions (PMID: 29394990). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 450370). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. Experimental studies have shown that this missense change affects CDC42 function (PMID: 29394990). For these reasons, this variant has been classified as Pathogenic. -

Oct 15, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Published functional studies demonstrate a damaging effect as p.(R68Q) significantly affected protein function and protein-protein interactions (PMID: 29394990); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 36939041, 29394990) -

Nov 01, 2017

Tartaglia Lab, Genetics and Rare Diseases Research Division, Bambino Gesu' Children's Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Abnormal facial shape;C0850715:Abnormality of blood and blood-forming tissues;C1859778:Postnatal growth retardation;C4021753:Abnormality of the immune system;C4022737:Neurodevelopmental abnormality Pathogenic:1

-

University of Washington Center for Mendelian Genomics, University of Washington

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Macrothrombocytopenia-lymphedema-developmental delay-facial dysmorphism-camptodactyly syndrome Pathogenic:1

May 21, 2020

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was determined to be pathogenic according to ACMG Guidelines, 2015 [PMID:25741868]. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.37	D
BayesDel_noAF	Pathogenic	0.30
CADD	Pathogenic	28
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.66	.;D;D;.;D
Eigen	Pathogenic	0.95
Eigen_PC	Pathogenic	0.90
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.91	D;.;.;D;D
M_CAP	Uncertain	0.23	D
MetaRNN	Pathogenic	0.89	D;D;D;D;D
MetaSVM	Uncertain	0.66	D
MutationAssessor	Pathogenic	4.1	.;H;H;H;.
PhyloP100		7.9
PrimateAI	Pathogenic	0.82	D
PROVEAN	Uncertain	-3.6	.;D;D;D;D
REVEL	Pathogenic	0.83
Sift	Uncertain	0.0010	.;D;D;D;D
Sift4G	Uncertain	0.020	.;D;D;D;D
Polyphen		0.68, 0.86	.;P;P;P;.
Vest4		0.77, 0.71
MVP		0.93
MPC		2.3
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.98
gMVP		0.94
Mutation Taster		=0/100	disease causing (ClinVar)

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: rs1553196096; hg19: chr1-22412956;