Genetic Variant IER3IP1:c.194-3C>G (chr18-47156235-G-C) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_016097.5(IER3IP1):c.194-3C>G variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000734 in 1,361,480 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 7.3e-7 ( 0 hom. )

Consequence

IER3IP1
NM_016097.5 splice_region, intron

Scores

Splicing: ADA: 0.9999

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.00

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

IER3IP1 links:

ENSG00000267228 (HGNC:):

ENSG00000267228 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF, max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016097.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IER3IP1	NM_016097.5	MANE Select	c.194-3C>G		splice_region intron	N/A	NP_057181.1	Q9Y5U9

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
IER3IP1	ENST00000256433.6	TSL:1 MANE Select	c.194-3C>G	splice_region intron	N/A	ENSP00000256433.3	Q9Y5U9
ENSG00000267228	ENST00000588705.1	TSL:2	n.194-3C>G	splice_region intron	N/A	ENSP00000465194.1
IER3IP1	ENST00000932440.1		c.311-3C>G	splice_region intron	N/A	ENSP00000602499.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.34e-7

AC:

AN:

1361480

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

680548

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

30552

American (AMR)

AF:

0.00

AC:

AN:

40846

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25022

East Asian (EAS)

AF:

0.00

AC:

AN:

39084

South Asian (SAS)

AF:

0.00

AC:

AN:

79078

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53092

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5548

European-Non Finnish (NFE)

AF:

9.70e-7

AC:

AN:

1031336

Other (OTH)

AF:

0.00

AC:

AN:

56922

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.32

CADD

Uncertain

(source)

DANN

Benign

0.94

PhyloP100

2.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.90

SpliceAI score (max)

0.98

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.93

Position offset: -1

DS_AL_spliceai

0.98

Position offset: -3

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over