20-34393814-G-A

Variant summary

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

The NM_031483.7(ITCH):c.3G>A(p.Met1?) variant causes a start lost change. The variant allele was found at a frequency of 0.00000342 in 1,460,776 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: ITCH NM_031483.7 start_lost
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 4.21

Genes affected

ITCH (HGNC:13890): (itchy E3 ubiquitin protein ligase) This gene encodes a member of the Nedd4 family of HECT domain E3 ubiquitin ligases. HECT domain E3 ubiquitin ligases transfer ubiquitin from E2 ubiquitin-conjugating enzymes to protein substrates, thus targeting specific proteins for lysosomal degradation. The encoded protein plays a role in multiple cellular processes including erythroid and lymphoid cell differentiation and the regulation of immune responses. Mutations in this gene are a cause of syndromic multisystem autoimmune disease. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 20-34393814-G-A is Pathogenic according to our data. Variant chr20-34393814-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3064498.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ITCH	NM_031483.7	c.3G>A	p.Met1?	start_lost	3/25	ENST00000374864.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ITCH	ENST00000374864.10	c.3G>A	p.Met1?	start_lost	3/25	1	NM_031483.7	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 0.00000342 AC: 5 AN: 1460776 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 726834

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000756

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Syndromic multisystem autoimmune disease due to ITCH deficiency Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center

Mar 25, 2024

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Uncertain	0.040
Cadd	Uncertain	25
Dann	Uncertain	1.0
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.63
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.90	D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.98	D;D;D
MetaSVM	Benign	-0.79	T
MutationTaster	Benign	1.0	D;D;D
PROVEAN	Benign	-1.4	N;.;N
REVEL	Benign	0.27
Sift	Benign	0.060	T;.;T
Sift4G	Benign	0.069	T;.;T
Polyphen		0.98	.;.;D
Vest4		0.86
MutPred		0.99		Gain of catalytic residue at M1 (P = 0.0356);Gain of catalytic residue at M1 (P = 0.0356);Gain of catalytic residue at M1 (P = 0.0356);
MVP		0.82
ClinPred		0.97	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.22
gMVP		0.35

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: rs2038571383; hg19: chr20-32981620;