chr3-87245899-T-G

Variant names:

• chr3-87245899-T-G
• rs11540913
• NM_014043.4:c.312T>G

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_014043.4(CHMP2B):​c.312T>G​(p.Thr104Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. T104T) has been classified as Benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: CHMP2B NM_014043.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.616
• Publications: 27 publications found

Genes affected

CHMP2B (HGNC:24537): (charged multivesicular body protein 2B) This gene encodes a component of the heteromeric ESCRT-III complex (Endosomal Sorting Complex Required for Transport III) that functions in the recycling or degradation of cell surface receptors. ESCRT-III functions in the concentration and invagination of ubiquitinated endosomal cargos into intralumenal vesicles. The protein encoded by this gene is found as a monomer in the cytosol or as an oligomer in ESCRT-III complexes on endosomal membranes. It is expressed in neurons of all major regions of the brain. Mutations in this gene result in one form of familial frontotemporal lobar degeneration. [provided by RefSeq, Jul 2008]

CHMP2B Gene-Disease associations (from GenCC):

• frontotemporal dementia and/or amyotrophic lateral sclerosis 7

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, LIMITED Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• amyotrophic lateral sclerosis type 17

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• amyotrophic lateral sclerosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.47).
• BP7: Synonymous conserved (PhyloP=-0.616 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_014043.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHMP2B	NM_014043.4	MANE Select	c.312T>G	p.Thr104Thr	synonymous	Exon 3 of 6	NP_054762.2
	CHMP2B	NM_001410777.1		c.408T>G	p.Thr136Thr	synonymous	Exon 4 of 7	NP_001397706.1
	CHMP2B	NM_001244644.2		c.189T>G	p.Thr63Thr	synonymous	Exon 2 of 5	NP_001231573.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHMP2B	ENST00000263780.9	TSL:1 MANE Select	c.312T>G	p.Thr104Thr	synonymous	Exon 3 of 6	ENSP00000263780.4
	CHMP2B	ENST00000472024.3	TSL:5	c.360T>G	p.Thr120Thr	synonymous	Exon 4 of 7	ENSP00000480032.2
	CHMP2B	ENST00000676705.1		c.360T>G	p.Thr120Thr	synonymous	Exon 4 of 7	ENSP00000504098.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.47
CADD	Benign	4.6
DANN	Benign	0.72
PhyloP100		-0.62

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: rs11540913; hg19: chr3-87295049;