chr11-68939605-C-T

Variant names:

• chr11-68939605-C-T
• rs759627672
• NM_002180.3:c.2856C>T

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_Strong BP6 BP7

The NM_002180.3(IGHMBP2):​c.2856C>T​(p.Ala952Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000589 in 1,613,332 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. A952A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.000059 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000059 (0 hom.)
• Consequence: IGHMBP2 NM_002180.3 synonymous
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:3
• Conservation: PhyloP100: -7.14
• Publications: 1 publications found

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 Gene-Disease associations (from GenCC):

• autosomal recessive distal spinal muscular atrophy 1

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Ambry Genetics, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• Charcot-Marie-Tooth disease axonal type 2S

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Ambry Genetics, Laboratory for Molecular Medicine, Orphanet, Labcorp Genetics (formerly Invitae)
• hereditary peripheral neuropathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

ACMG classification

Our verdict: Likely_benign. The variant received -6 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.75).
• BP6: Variant 11-68939605-C-T is Benign according to our data. Variant chr11-68939605-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 305863.
• BP7: Synonymous conserved (PhyloP=-7.14 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_002180.3. 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
	IGHMBP2	NM_002180.3	MANE Select	c.2856C>T	p.Ala952Ala	synonymous	Exon 15 of 15	NP_002171.2	P38935

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IGHMBP2	ENST00000255078.8	TSL:1 MANE Select	c.2856C>T	p.Ala952Ala	synonymous	Exon 15 of 15	ENSP00000255078.4	P38935
	IGHMBP2	ENST00000544521.1	TSL:1	n.687C>T		non_coding_transcript_exon	Exon 2 of 2
	IGHMBP2	ENST00000925063.1		c.2673C>T	p.Ala891Ala	synonymous	Exon 14 of 14	ENSP00000595122.1

Frequencies

GnomAD3 genomes AF: 0.0000591 AC: 9 AN: 152228 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.000288

Gnomad EAS AF: 0.000770

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.0000719 AC: 18 AN: 250404 AF XY: 0.0000811

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000290

Gnomad ASJ exome AF: 0.0000996

Gnomad EAS exome AF: 0.000708

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000884

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000589 AC: 86 AN: 1461104 Hom.: 0 Cov.: 31 AF XY: 0.0000633 AC XY: 46 AN XY: 726884

African (AFR) AF: 0.0000598 AC: 2 AN: 33468

American (AMR) AF: 0.0000224 AC: 1 AN: 44714

Ashkenazi Jewish (ASJ) AF: 0.000115 AC: 3 AN: 26130

East Asian (EAS) AF: 0.000302 AC: 12 AN: 39698

South Asian (SAS) AF: 0.0000348 AC: 3 AN: 86238

European-Finnish (FIN) AF: 0.0000189 AC: 1 AN: 53008

Middle Eastern (MID) AF: 0.000181 AC: 1 AN: 5516

European-Non Finnish (NFE) AF: 0.0000567 AC: 63 AN: 1111972

Other (OTH) AF: 0.00 AC: 0 AN: 60360

GnomAD4 genome AF: 0.0000591 AC: 9 AN: 152228 Hom.: 0 Cov.: 33 AF XY: 0.0000941 AC XY: 7 AN XY: 74364

African (AFR) AF: 0.00 AC: 0 AN: 41456

American (AMR) AF: 0.00 AC: 0 AN: 15290

Ashkenazi Jewish (ASJ) AF: 0.000288 AC: 1 AN: 3470

East Asian (EAS) AF: 0.000770 AC: 4 AN: 5196

South Asian (SAS) AF: 0.00 AC: 0 AN: 4836

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10626

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.0000441 AC: 3 AN: 68036

Other (OTH) AF: 0.000478 AC: 1 AN: 2092

Alfa AF: 0.0000329 Hom.: 0

Bravo AF: 0.0000529

EpiCase AF: 0.000109

EpiControl AF: 0.0000593

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	1	-	Autosomal recessive distal spinal muscular atrophy 1 (1)
-	-	1	Autosomal recessive distal spinal muscular atrophy 1;C4015349:Charcot-Marie-Tooth disease axonal type 2S (1)
-	-	1	Inborn genetic diseases (1)
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.75
CADD	Benign	0.34
DANN	Benign	0.89
PhyloP100		-7.1

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

Other links and lift over

dbSNP: rs759627672; hg19: chr11-68707073; COSMIC: COSV99662401; COSMIC: COSV99662401;