chr13-48261208-C-CTTTAATTTGT

Variant names:

• chr13-48261208-C-CTTTAATTTGT
• rs606231166
• NM_021999.5:c.787_796dupTTAATTTGTT

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP5

The NM_021999.5(ITM2B):​c.787_796dupTTAATTTGTT​(p.Ser266PhefsTer13) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ITM2B NM_021999.5 frameshift
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.292
• Publications: 7 publications found

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 Gene-Disease associations (from GenCC):

• ABri amyloidosis

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet
• ADan amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinal dystrophy with inner retinal dysfunction and ganglion cell anomalies

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-48261208-C-CTTTAATTTGT is Pathogenic according to our data. Variant chr13-48261208-C-CTTTAATTTGT is described in ClinVar as Pathogenic. ClinVar VariationId is 5980.Status of the report is no_assertion_criteria_provided, 0 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_021999.5. 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
	ITM2B	NM_021999.5	MANE Select	c.787_796dupTTAATTTGTT	p.Ser266PhefsTer13	frameshift	Exon 6 of 6	NP_068839.1	Q9Y287-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ITM2B	ENST00000647800.2	MANE Select	c.787_796dupTTAATTTGTT	p.Ser266PhefsTer13	frameshift	Exon 6 of 6	ENSP00000497221.1	Q9Y287-1
	ITM2B	ENST00000970638.1		c.853_862dupTTAATTTGTT	p.Ser288PhefsTer13	frameshift	Exon 7 of 7	ENSP00000640697.1
	ITM2B	ENST00000899433.1		c.751_760dupTTAATTTGTT	p.Ser254PhefsTer13	frameshift	Exon 6 of 6	ENSP00000569492.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: no assertion criteria provided

Pathogenic	VUS	Benign	Condition
1	-	-	ADan amyloidosis (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.29
Mutation Taster		=6/194	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs606231166; hg19: chr13-48835344;