1-1014011-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_005101.4(ISG15):c.31G>A(p.Ala11Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000483 in 1,450,730 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A11V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 35)
  • Exomes 𝑓: 0.0000048 (0 hom.)
• Consequence: ISG15 NM_005101.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0250

Genes affected

ISG15 (HGNC:4053): (ISG15 ubiquitin like modifier) The protein encoded by this gene is a ubiquitin-like protein that is conjugated to intracellular target proteins upon activation by interferon-alpha and interferon-beta. Several functions have been ascribed to the encoded protein, including chemotactic activity towards neutrophils, direction of ligated target proteins to intermediate filaments, cell-to-cell signaling, and antiviral activity during viral infections. While conjugates of this protein have been found to be noncovalently attached to intermediate filaments, this protein is sometimes secreted. [provided by RefSeq, Dec 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ISG15	NM_005101.4	c.31G>A	p.Ala11Thr	missense_variant	2/2	ENST00000649529.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ISG15	ENST00000649529.1	c.31G>A	p.Ala11Thr	missense_variant	2/2		NM_005101.4	P1
ISG15	ENST00000624697.4	c.7G>A	p.Ala3Thr	missense_variant	3/3	3
ISG15	ENST00000624652.1	c.7G>A	p.Ala3Thr	missense_variant	3/3	3

Frequencies

GnomAD3 genomes Cov.: 35

GnomAD3 exomes AF: 0.00000403 AC: 1 AN: 248322 Hom.: 0 AF XY: 0.00000744 AC XY: 1 AN XY: 134424

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000329

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000483 AC: 7 AN: 1450730 Hom.: 0 Cov.: 31 AF XY: 0.00000556 AC XY: 4 AN XY: 719276

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000815

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 35

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Mendelian susceptibility to mycobacterial diseases due to complete ISG15 deficiency Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jun 04, 2019

This sequence change replaces alanine with threonine at codon 11 of the ISG15 protein (p.Ala11Thr). The alanine residue is weakly conserved and there is a small physicochemical difference between alanine and threonine. This variant is not present in population databases (ExAC no frequency). This variant has not been reported in the literature in individuals with ISG15-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The threonine amino acid residue is found in multiple mammalian species, suggesting that this missense change does not adversely affect protein function. These predictions have not been confirmed by published functional studies and their clinical significance is uncertain. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.098
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.60
Cadd	Benign	17
Dann	Uncertain	0.99
DEOGEN2	Benign	0.0063	T;T;T;T
Eigen	Benign	-1.1
Eigen_PC	Benign	-0.99
FATHMM_MKL	Benign	0.068	N
LIST_S2	Benign	0.43	T;T;.;T
M_CAP	Benign	0.040	D
MetaRNN	Benign	0.070	T;T;T;T
MetaSVM	Benign	-0.98	T
MutationTaster	Benign	1.0	N
PrimateAI	Benign	0.31	T
Sift4G	Benign	1.0	T;T;T;.
Polyphen		0.0	.;.;B;B
Vest4		0.036
MutPred		0.35		.;.;Loss of sheet (P = 0.1158);Loss of sheet (P = 0.1158);
MVP		0.16
MPC		0.20
ClinPred		0.12	T
GERP RS		0.66
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.16
gMVP		0.21

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.40		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.40		Position offset: 18

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1241025790; hg19: chr1-949391;