chr13-48233380-A-G

Position:

chr13-48233380-A-G

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_021999.5(ITM2B):c.20A>G(p.Asn7Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000326 in 1,563,918 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000030 ( 0 hom. )

Consequence

ITM2B
NM_021999.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.54

Variant links:

Genes affected

ITM2B (HGNC:6174): (integral membrane protein 2B) Amyloid precursor proteins are processed by beta-secretase and gamma-secretase to produce beta-amyloid peptides which form the characteristic plaques of Alzheimer disease. This gene encodes a transmembrane protein which is processed at the C-terminus by furin or furin-like proteases to produce a small secreted peptide which inhibits the deposition of beta-amyloid. Mutations which result in extension of the C-terminal end of the encoded protein, thereby increasing the size of the secreted peptide, are associated with two neurogenerative diseases, familial British dementia and familial Danish dementia. [provided by RefSeq, Oct 2009]

ITM2B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.15216765).

BS2

High AC in GnomAd4 at 9 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ITM2B	NM_021999.5 linkuse as main transcript	c.20A>G	p.Asn7Ser	missense_variant	1/6	ENST00000647800.2	NP_068839.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ITM2B	ENST00000647800.2 linkuse as main transcript	c.20A>G	p.Asn7Ser	missense_variant	1/6		NM_021999.5	ENSP00000497221.1		Q9Y287-1

Frequencies

GnomAD3 genomes

AF:

0.0000593

AC:

AN:

151694

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000170

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000274

AC:

AN:

182398

Hom.:

AF XY:

0.00000997

AC XY:

AN XY:

100344

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000181

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000297

AC:

AN:

1412224

Hom.:

Cov.:

AF XY:

0.0000214

AC XY:

AN XY:

700154

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000128

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000321

Gnomad4 OTH exome

AF:

0.0000344

GnomAD4 genome

AF:

0.0000593

AC:

AN:

151694

Hom.:

Cov.:

AF XY:

0.0000540

AC XY:

AN XY:

74114

show subpopulations

Gnomad4 AFR

AF:

0.000170

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000718

ExAC

AF:

0.0000253

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 19, 2023

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬†is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 2140151). This variant has not been reported in the literature in individuals affected with ITM2B-related conditions. This variant is present in population databases (rs779234032, gnomAD 0.02%). This sequence change replaces asparagine, which is neutral and polar, with serine, which is neutral and polar, at codon 7 of the ITM2B protein (p.Asn7Ser). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.068

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.55

CADD

Benign

DANN

Benign

0.94

DEOGEN2

Benign

0.36

T;.;T

Eigen

Benign

-0.10

Eigen_PC

Benign

0.0016

FATHMM_MKL

Benign

0.74

LIST_S2

Uncertain

0.89

.;D;D

M_CAP

Uncertain

0.13

MetaRNN

Benign

0.15

T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

1.4

L;L;L

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-2.4

N;N;.

REVEL

Benign

0.063

Sift

Benign

0.16

T;T;.

Sift4G

Benign

0.23

T;T;.

Polyphen

0.39

B;.;B

Vest4

0.40

MutPred

0.33

Gain of phosphorylation at N7 (P = 0.0503);Gain of phosphorylation at N7 (P = 0.0503);Gain of phosphorylation at N7 (P = 0.0503);

MVP

0.41

MPC

0.33

ClinPred

0.13

GERP RS

3.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.16

gMVP

0.44

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over