rs132630273

Variant names:

• chrX-48684284-C-G
• rs132630273
• NM_000377.3:c.134C>G

Your query was ambiguous. Multiple possible variants found:

• chrX-48684284-C-G
• chrX-48684284-C-T

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM1 PM2 PM5 PP3_Strong PP5

The NM_000377.3(WAS):​c.134C>G​(p.Thr45Arg) variant causes a missense, splice region change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T45M) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 22)
• Consequence: WAS NM_000377.3 missense, splice_region
• Scores: Splicing: ADA: 0.4931
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 3.90
• Publications: 0 publications found

Genes affected

WAS (HGNC:12731): (WASP actin nucleation promoting factor) The Wiskott-Aldrich syndrome (WAS) family of proteins share similar domain structure, and are involved in transduction of signals from receptors on the cell surface to the actin cytoskeleton. The presence of a number of different motifs suggests that they are regulated by a number of different stimuli, and interact with multiple proteins. Recent studies have demonstrated that these proteins, directly or indirectly, associate with the small GTPase, Cdc42, known to regulate formation of actin filaments, and the cytoskeletal organizing complex, Arp2/3. Wiskott-Aldrich syndrome is a rare, inherited, X-linked, recessive disease characterized by immune dysregulation and microthrombocytopenia, and is caused by mutations in the WAS gene. The WAS gene product is a cytoplasmic protein, expressed exclusively in hematopoietic cells, which show signalling and cytoskeletal abnormalities in WAS patients. A transcript variant arising as a result of alternative promoter usage, and containing a different 5' UTR sequence, has been described, however, its full-length nature is not known. [provided by RefSeq, Jul 2008]

WAS Gene-Disease associations (from GenCC):

• Wiskott-Aldrich syndrome

  Inheritance: XL, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
• X-linked severe congenital neutropenia

  Inheritance: XL Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet
• thrombocytopenia 1

  Inheritance: XL Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000232828 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 4 uncertain in NM_000377.3
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-48684284-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 11123.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.946
• PP5: Variant X-48684284-C-G is Pathogenic according to our data. Variant chrX-48684284-C-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 3045830.Status of the report is no_assertion_criteria_provided, 0 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
WAS	NM_000377.3	c.134C>G	p.Thr45Arg	missense_variant, splice_region_variant	Exon 2 of 12	ENST00000376701.5	NP_000368.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
WAS	ENST00000376701.5	c.134C>G	p.Thr45Arg	missense_variant, splice_region_variant	Exon 2 of 12	1	NM_000377.3	ENSP00000365891.4

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 22

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

WAS-related disorder Pathogenic:1

Jan 11, 2024

PreventionGenetics, part of Exact Sciences

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The WAS c.134C>G variant is predicted to result in the amino acid substitution p.Thr45Arg. To our knowledge, this variant has not been reported in the literature. However, different missense substitutions at this codon (e.g: p.Thr45Lys; p.Thr45Met) have been observed in individuals with Wiskott-Aldrich syndrome (Zhang et al. 2010. PubMed ID: 20546529; Kwan et al. 1995. PubMed ID: 7753869) suggesting that substitution of amino acid residue p.Thr45 is not tolerated. Additionally, an individual with this variant was found to have decreased WAS activity level (internal data at PreventionGenetics). This variant has not been reported in a large population database, indicating this variant is rare. This variant is interpreted as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.81	D;D
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.95	D;D
M_CAP	Pathogenic	0.92	D
MetaRNN	Pathogenic	0.95	D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.8	.;M
PhyloP100		3.9
PrimateAI	Uncertain	0.65	T
PROVEAN	Pathogenic	-4.5	D;D
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0010	D;D
Sift4G	Uncertain	0.0030	D;D
Polyphen		1.0	.;D
Vest4		0.81
MutPred		0.74		Gain of MoRF binding (P = 0.0043);Gain of MoRF binding (P = 0.0043);
MVP		1.0
MPC		1.7
ClinPred		1.0	D
GERP RS		4.5
PromoterAI		-0.0056	Neutral
Varity_R		0.97
gMVP		0.97
Mutation Taster		=40/60	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.49
dbscSNV1_RF	Benign	0.55
SpliceAI score (max)		0.17		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: rs132630273; hg19: chrX-48542673;