20-58389302-AC-ACCCCC

Variant names:

• chr20-58389302-A-ACCCC
• rs546898989
• NM_004738.5:c.-152_-149dupCCCC

Variant summary

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

The NM_004738.5(VAPB):​c.-152_-149dupCCCC variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 27)
  • Exomes 𝑓: 0.000015 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: VAPB NM_004738.5 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.452
• Publications: 0 publications found

Genes affected

VAPB (HGNC:12649): (VAMP associated protein B and C) The protein encoded by this gene is a type IV membrane protein found in plasma and intracellular vesicle membranes. The encoded protein is found as a homodimer and as a heterodimer with VAPA. This protein also can interact with VAMP1 and VAMP2 and may be involved in vesicle trafficking. [provided by RefSeq, Jul 2008]

VAPB Gene-Disease associations (from GenCC):

• amyotrophic lateral sclerosis type 8

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), ClinGen
• adult-onset proximal spinal muscular atrophy, autosomal dominant

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• amyotrophic lateral sclerosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004738.5. 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
	VAPB	NM_004738.5	MANE Select	c.-152_-149dupCCCC		5_prime_UTR	Exon 1 of 6	NP_004729.1	O95292-1
	VAPB	NM_001195677.2		c.-152_-149dupCCCC		5_prime_UTR	Exon 1 of 3	NP_001182606.1	O95292-2
	VAPB	NR_036633.2		n.80_83dupCCCC		non_coding_transcript_exon	Exon 1 of 4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	VAPB	ENST00000475243.6	TSL:1 MANE Select	c.-152_-149dupCCCC		5_prime_UTR	Exon 1 of 6	ENSP00000417175.1	O95292-1
	VAPB	ENST00000903510.1		c.-152_-149dupCCCC		5_prime_UTR	Exon 1 of 7	ENSP00000573569.1
	VAPB	ENST00000903509.1		c.-152_-149dupCCCC		5_prime_UTR	Exon 1 of 5	ENSP00000573568.1

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 128504 Hom.: 0 Cov.: 27

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: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000147 AC: 1 AN: 67844 AF XY: 0.0000265

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.000216

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000147 AC: 4 AN: 271602 Hom.: 0 Cov.: 5 AF XY: 0.0000194 AC XY: 3 AN XY: 154570

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 5644

American (AMR) AF: 0.00 AC: 0 AN: 22408

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 9450

East Asian (EAS) AF: 0.00 AC: 0 AN: 7564

South Asian (SAS) AF: 0.0000190 AC: 1 AN: 52740

European-Finnish (FIN) AF: 0.0000586 AC: 1 AN: 17068

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 1030

European-Non Finnish (NFE) AF: 0.00000698 AC: 1 AN: 143196

Other (OTH) AF: 0.0000800 AC: 1 AN: 12502

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.0000000482131), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 128504 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 61714

African (AFR) AF: 0.00 AC: 0 AN: 34872

American (AMR) AF: 0.00 AC: 0 AN: 13258

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3108

East Asian (EAS) AF: 0.00 AC: 0 AN: 4080

South Asian (SAS) AF: 0.00 AC: 0 AN: 3478

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 7356

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 250

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 59574

Other (OTH) AF: 0.00 AC: 0 AN: 1736

Alfa AF: 0.0000472 Hom.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.45

Splicing

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

Other links and lift over

dbSNP: rs546898989; hg19: chr20-56964358;