chr18-47156209-T-C

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 3P and 4B. PM2PP2BP4_Strong

The NM_016097.5(IER3IP1):c.217A>G(p.Ile73Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000319 in 1,568,612 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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. I73T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

IER3IP1
NM_016097.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.20

Publications

0 publications found

Variant links:

Genes affected

IER3IP1 (HGNC:18550): (immediate early response 3 interacting protein 1) This gene encodes a small protein that is localized to the endoplasmic reticulum (ER) and may play a role in the ER stress response by mediating cell differentiation and apoptosis. Transcription of this gene is regulated by tumor necrosis factor alpha and specificity protein 1 (Sp1). Mutations in this gene may play a role in microcephaly, epilepsy, and diabetes syndrome (MEDS), and a pseudogene of this gene is located on the long arm of chromosome 12. [provided by RefSeq, Dec 2011]

IER3IP1 Gene-Disease associations (from GenCC):

microcephaly, epilepsy, and diabetes syndrome 1
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
primary microcephaly-epilepsy-permanent neonatal diabetes syndrome
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet

IER3IP1 links:

ENSG00000267228 (HGNC:):

ENSG00000267228 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

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

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 1 curated pathogenic missense variants (we use a threshold of 10). The gene has 0 curated benign missense variants. Gene score misZ: -0.39197 (below the threshold of 3.09). Trascript score misZ: -0.049149 (below the threshold of 3.09). GenCC associations: The gene is linked to microcephaly, epilepsy, and diabetes syndrome 1, primary microcephaly-epilepsy-permanent neonatal diabetes syndrome.

BP4

Computational evidence support a benign effect (MetaRNN=0.036862105).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IER3IP1	NM_016097.5 link	c.217A>G	p.Ile73Val	missense_variant	Exon 3 of 3	ENST00000256433.6	NP_057181.1	Q9Y5U9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
IER3IP1	ENST00000256433.6 link	c.217A>G	p.Ile73Val	missense_variant	Exon 3 of 3	1	NM_016097.5	ENSP00000256433.3	Q9Y5U9
ENSG00000267228	ENST00000588705.1 link	n.217A>G		non_coding_transcript_exon_variant	Exon 3 of 6	2		ENSP00000465194.1
ENSG00000267228	ENST00000602459.6 link	n.92-19760A>G		intron_variant	Intron 1 of 6	5		ENSP00000473358.1	R4GN61
ENSG00000267228	ENST00000602926.5 link	n.92-19760A>G		intron_variant	Intron 1 of 2	2		ENSP00000473502.1	R4GN61

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151866

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000802

AC:

AN:

249400

AF XY:

0.00000742

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000545

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000282

AC:

AN:

1416746

Hom.:

Cov.:

AF XY:

0.00000283

AC XY:

AN XY:

707044

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

32580

American (AMR)

AF:

0.00

AC:

AN:

44558

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25832

East Asian (EAS)

AF:

0.0000254

AC:

AN:

39392

South Asian (SAS)

AF:

0.0000118

AC:

AN:

84764

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53362

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5660

European-Non Finnish (NFE)

AF:

9.33e-7

AC:

AN:

1071688

Other (OTH)

AF:

0.0000170

AC:

AN:

58910

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151866

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74168

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41332

American (AMR)

AF:

0.00

AC:

AN:

15236

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.000192

AC:

AN:

5198

South Asian (SAS)

AF:

0.00

AC:

AN:

4798

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10540

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67984

Other (OTH)

AF:

0.00

AC:

AN:

2084

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.625

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:

0.00

Hom.:

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Microcephaly, epilepsy, and diabetes syndrome

Uncertain:1

May 22, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 73 of the IER3IP1 protein (p.Ile73Val). This variant is present in population databases (no rsID available, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with IER3IP1-related conditions. ClinVar contains an entry for this variant (Variation ID: 581459). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Not Available"; PolyPhen-2: "Benign"; Align-GVGD: "Not Available". The valine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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

0.050

BayesDel_addAF

Benign

-0.24

BayesDel_noAF

Benign

-0.42

CADD

Benign

0.0060

(source)

DANN

Benign

0.45

DEOGEN2

Benign

0.19

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.2

FATHMM_MKL

Benign

0.041

LIST_S2

Benign

0.61

M_CAP

Benign

0.012

MetaRNN

Benign

0.037

MetaSVM

Benign

-0.93

PhyloP100

-1.2

PrimateAI

Benign

0.34

PROVEAN

Benign

0.070

REVEL

Benign

0.19

Sift

Benign

0.93

Sift4G

Benign

1.0

Polyphen

0.0

Vest4

0.088

MutPred

0.45

Loss of catalytic residue at L78 (P = 0.028);

MVP

0.24

MPC

0.051

ClinPred

0.013

GERP RS

-6.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.021

gMVP

0.37

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.030

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