rs756985703

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 3P and 1B. PM2PP5BP4

The NM_002180.3(IGHMBP2):c.1591C>A(p.Pro531Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000174 in 1,612,872 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000018 ( 0 hom. )

Consequence

IGHMBP2
NM_002180.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:3

Conservation

PhyloP100: 2.74

Variant links:

Genes affected

IGHMBP2 (HGNC:5542): (immunoglobulin mu DNA binding protein 2) This gene encodes a helicase superfamily member that binds a specific DNA sequence from the immunoglobulin mu chain switch region. Mutations in this gene lead to spinal muscle atrophy with respiratory distress type 1. [provided by RefSeq, Jul 2008]

IGHMBP2 links:

IGHMBP2 (HGNC:):

IGHMBP2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 11-68934517-C-A is Pathogenic according to our data. Variant chr11-68934517-C-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 204302.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=2, Likely_pathogenic=2}.

BP4

Computational evidence support a benign effect (MetaRNN=0.36226737). . Strength limited to SUPPORTING due to the PP5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IGHMBP2	NM_002180.3 linkuse as main transcript	c.1591C>A	p.Pro531Thr	missense_variant	11/15	ENST00000255078.8	NP_002171.2	P38935

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IGHMBP2	ENST00000255078.8 linkuse as main transcript	c.1591C>A	p.Pro531Thr	missense_variant	11/15	1	NM_002180.3	ENSP00000255078.4		P38935

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152228

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:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000363

AC:

AN:

247920

Hom.:

AF XY:

0.0000522

AC XY:

AN XY:

134224

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000298

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000185

AC:

AN:

1460644

Hom.:

Cov.:

AF XY:

0.0000317

AC XY:

AN XY:

726460

show subpopulations

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:

0.000314

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152228

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74384

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

ExAC

AF:

0.0000741

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:3

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Charcot-Marie-Tooth disease axonal type 2S

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Foundation for Research in Genetics and Endocrinology, FRIGE's Institute of Human Genetics	Jun 28, 2023	A heterozygous missense substitution (p.Pro531Thr) lies in exon 11 of the IGHMBP2 gene and alters a mildly conserved residue in the protein. The variant c.1591C>A has a minor allele frequency of 0.004% in the gnomAD database. The variant is predicted to be damaging by FATHM. In summary, the variant meets our criteria to be classified as variant of uncertain significance. -
Likely pathogenic, criteria provided, single submitter	clinical testing	3billion	Jan 03, 2022	Same nucleotide change resulting in same amino acid change has been previously reported to be associated with IGHMBP2 related disorder (PMID:25439726, PS1_P). The variant has been reported to be in trans with a pathogenic variant as either compound heterozygous or homozygous in at least one similarly affected unrelated individual (PMID: 25439726, 3billion datet, PM3_M). In silico tool predictions suggest damaging effect of the variant on gene or gene product (REVEL: 0.678, PP3_P). It is observed at an extremely low frequency in the gnomAD v2.1.1 dataset (total allele frequency: 0.000036, PM2_M). Therefore, this variant is classified as likely pathogenic according to the recommendation of ACMG/AMP guideline. -

Autosomal recessive distal spinal muscular atrophy 1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Lifecell International Pvt. Ltd

A Heterozygous Missense variant c.1591C>A in Exon 11 of the IGHMBP2 gene that results in the amino acid substitution p.Pro531Thr was identified. The observed variant has a minor allele frequency of 0.00004% in gnomAD exomes and is novel in genomes. The severity of the impact of this variant on the protein is medium, based on the effect of the protein and REVEL score . Rare Exome Variant Ensemble Learner (REVEL) is an ensembl method for predicting the pathogenicity of missense variants based on a combination of scores from 13 individual tools: MutPred, FATHMM v2.3, VEST 3.0, PolyPhen-2, SIFT, PROVEAN, MutationAssessor, MutationTaster, LRT, GERP++, SiPhy, phyloP, and phastCons. The REVEL score for an individual missense variant can range from 0 to 1, with higher scores reflecting greater likelihood that the variant is disease-causing. ClinVar has also classified this variant as Conflicting Interpretations Likely Pathogenic/Uncertain Significance [Variation ID: 204302]. The observed variation has been previously reported in patients affected with Neuropathy (Cottenie, Ellen et al., 2014). For these reasons, this variant has been classified as Likely Pathogenic. -

Charcot-Marie-Tooth disease

Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium

- -

Autosomal recessive distal spinal muscular atrophy 1;C4015349:Charcot-Marie-Tooth disease axonal type 2S

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jun 15, 2022

This sequence change replaces proline, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 531 of the IGHMBP2 protein (p.Pro531Thr). This variant is present in population databases (rs756985703, gnomAD 0.03%). This missense change has been observed in individual(s) with Charcot-Marie Tooth disease type 2 and/or Down syndrome (PMID: 25439726). ClinVar contains an entry for this variant (Variation ID: 204302). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt IGHMBP2 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

0.082

BayesDel_addAF

Benign

-0.28

BayesDel_noAF

Benign

-0.34

CADD

Benign

DANN

Benign

0.70

DEOGEN2

Uncertain

0.45

Eigen

Benign

-0.89

Eigen_PC

Benign

-0.87

FATHMM_MKL

Benign

0.11

LIST_S2

Uncertain

0.95

M_CAP

Uncertain

0.19

MetaRNN

Benign

0.36

MetaSVM

Benign

-0.83

MutationAssessor

Benign

0.26

PrimateAI

Benign

0.25

PROVEAN

Benign

-0.41

REVEL

Pathogenic

0.68

Sift

Benign

0.26

Sift4G

Benign

0.32

Polyphen

0.034

Vest4

0.70

MutPred

0.49

Gain of catalytic residue at P531 (P = 0.0466);

MVP

0.66

MPC

0.30

ClinPred

0.035

GERP RS

3.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.16

gMVP

0.35

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