Genetic Variant ITM2A:p.Arg226His (chrX-79361355-C-T) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4BS2

The NM_004867.5(ITM2A):c.677G>A(p.Arg226His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 1,207,762 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 4 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000045 ( 0 hom., 2 hem., cov: 24)

Exomes 𝑓: 0.000010 ( 0 hom. 2 hem. )

Consequence

ITM2A
NM_004867.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.28

Variant links:

Genes affected

ITM2A (HGNC:6173): (integral membrane protein 2A) This gene encodes a type II membrane protein that belongs to the ITM2 family. Studies in mouse suggest that it may be involved in osteo- and chondrogenic differentiation. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2010]

ITM2A links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.42253393).

BS2

High Hemizygotes in GnomAd4 at 2 gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ITM2A	NM_004867.5 link	c.677G>A	p.Arg226His	missense_variant	Exon 5 of 6	ENST00000373298.7	NP_004858.1	O43736-1
ITM2A	NM_001171581.2 link	c.545G>A	p.Arg182His	missense_variant	Exon 4 of 5		NP_001165052.1	O43736-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ITM2A	ENST00000373298.7 link	c.677G>A	p.Arg226His	missense_variant	Exon 5 of 6	1	NM_004867.5	ENSP00000362395.2	O43736-1
ITM2A	ENST00000434584.2 link	c.545G>A	p.Arg182His	missense_variant	Exon 4 of 5	2		ENSP00000415533.2	O43736-2
ITM2A	ENST00000469541.5 link	n.637G>A		non_coding_transcript_exon_variant	Exon 5 of 6	2

Frequencies

GnomAD3 genomes

AF:

0.0000446

AC:

AN:

112177

Hom.:

Cov.:

AF XY:

0.0000582

AC XY:

AN XY:

34375

show subpopulations

Gnomad AFR

AF:

0.000129

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000188

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000220

AC:

AN:

181669

Hom.:

AF XY:

0.00

AC XY:

AN XY:

66273

show subpopulations

Gnomad AFR exome

AF:

0.000152

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000135

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000123

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000100

AC:

AN:

1095585

Hom.:

Cov.:

AF XY:

0.00000554

AC XY:

AN XY:

361181

show subpopulations

Gnomad4 AFR exome

AF:

0.000152

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.000104

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000372

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000238

Gnomad4 OTH exome

AF:

0.0000217

GnomAD4 genome

AF:

0.0000446

AC:

AN:

112177

Hom.:

Cov.:

AF XY:

0.0000582

AC XY:

AN XY:

34375

show subpopulations

Gnomad4 AFR

AF:

0.000129

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000188

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000108

Hom.:

Bravo

AF:

0.0000264

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 27, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.677G>A (p.R226H) alteration is located in exon 5 (coding exon 5) of the ITM2A gene. This alteration results from a G to A substitution at nucleotide position 677, causing the arginine (R) at amino acid position 226 to be replaced by a histidine (H). 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

0.088

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Benign

-0.28

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.18

T;.

FATHMM_MKL

Benign

0.72

LIST_S2

Benign

0.79

T;T

M_CAP

Benign

0.050

MetaRNN

Benign

0.42

T;T

MetaSVM

Uncertain

-0.10

MutationAssessor

Benign

1.2

L;.

PrimateAI

Benign

0.48

PROVEAN

Uncertain

-3.5

D;D

REVEL

Uncertain

0.43

Sift

Uncertain

0.028

D;T

Sift4G

Benign

0.090

T;T

Polyphen

0.20

B;.

Vest4

0.47

MutPred

0.58

Loss of MoRF binding (P = 0.0132);.;

MVP

0.64

MPC

0.23

ClinPred

0.23

GERP RS

4.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.38

gMVP

0.93

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