chr20-34408663-A-G

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP4

The NM_031483.7(ITCH):c.83A>G(p.Lys28Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000245 in 1,613,326 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00023 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00025 ( 1 hom. )

Consequence

ITCH
NM_031483.7 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 8.91

Publications

1 publications found

Variant links:

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]

ITCH Gene-Disease associations (from GenCC):

syndromic multisystem autoimmune disease due to ITCH deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics

ITCH links:

ENSG00000289720 (HGNC:):

ENSG00000289720 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.26404).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ITCH	NM_031483.7 link	c.83A>G	p.Lys28Arg	missense_variant	Exon 4 of 25	ENST00000374864.10	NP_113671.3	Q96J02-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ITCH	ENST00000374864.10 link	c.83A>G	p.Lys28Arg	missense_variant	Exon 4 of 25	1	NM_031483.7	ENSP00000363998.4		Q96J02-2
ENSG00000289720	ENST00000696979.1 link	n.83A>G		non_coding_transcript_exon_variant	Exon 4 of 28			ENSP00000513014.1

Frequencies

GnomAD3 genomes

AF:

0.000230

AC:

AN:

152208

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000851

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000265

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000183

AC:

AN:

251200

AF XY:

0.000169

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.000463

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000220

Gnomad OTH exome

AF:

0.000327

GnomAD4 exome

AF:

0.000246

AC:

360

AN:

1461118

Hom.:

Cov.:

AF XY:

0.000220

AC XY:

160

AN XY:

726896

show subpopulations

African (AFR)

AF:

0.000149

AC:

AN:

33476

American (AMR)

AF:

0.000537

AC:

AN:

44722

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39666

South Asian (SAS)

AF:

0.00

AC:

AN:

86226

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53410

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000279

AC:

310

AN:

1111362

Other (OTH)

AF:

0.000348

AC:

AN:

60358

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.435

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000230

AC:

AN:

152208

Hom.:

Cov.:

AF XY:

0.000256

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.0000965

AC:

AN:

41444

American (AMR)

AF:

0.000851

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5200

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10614

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000265

AC:

AN:

68050

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.505

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000183

Hom.:

Bravo

AF:

0.000249

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000132

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.000237

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Syndromic multisystem autoimmune disease due to ITCH deficiency

Uncertain:1

Jun 14, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces lysine, which is basic and polar, with arginine, which is basic and polar, at codon 28 of the ITCH protein (p.Lys28Arg). This variant is present in population databases (rs373940007, gnomAD 0.05%). This variant has not been reported in the literature in individuals affected with ITCH-related conditions. ClinVar contains an entry for this variant (Variation ID: 581061). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Not Available"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Not Available"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Inborn genetic diseases

Uncertain:1

Apr 03, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.83A>G (p.K28R) alteration is located in exon 4 (coding exon 2) of the ITCH gene. This alteration results from a A to G substitution at nucleotide position 83, causing the lysine (K) at amino acid position 28 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.092

BayesDel_addAF

Benign

-0.043

BayesDel_noAF

Uncertain

0.030

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.26

.;.;T

Eigen

Uncertain

0.62

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.91

D;D;D

M_CAP

Benign

0.027

MetaRNN

Benign

0.26

T;T;T

MetaSVM

Benign

-0.69

MutationAssessor

Benign

1.9

L;.;L

PhyloP100

8.9

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

-1.6

N;.;N

REVEL

Uncertain

0.41

Sift

Benign

0.042

D;.;D

Sift4G

Benign

0.11

T;.;T

Polyphen

0.75

.;.;P

Vest4

0.53

MVP

0.87

MPC

0.62

ClinPred

0.027

GERP RS

5.3

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.13

gMVP

0.53

Mutation Taster

=36/64

disease causing

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over