21-26131105-C-T

Variant names:

• chr21-26131105-C-T
• rs380662
• NM_000484.4:c.58-18959G>A

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BA1

The NM_000484.4(APP):​c.58-18959G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 1 in 152,164 control chromosomes in the GnomAD database, including 76,082 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 1.0 (76082 hom., cov: 30)
• Consequence: APP NM_000484.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.921
• Publications: 2 publications found

Genes affected

APP (HGNC:620): (amyloid beta precursor protein) This gene encodes a cell surface receptor and transmembrane precursor protein that is cleaved by secretases to form a number of peptides. Some of these peptides are secreted and can bind to the acetyltransferase complex APBB1/TIP60 to promote transcriptional activation, while others form the protein basis of the amyloid plaques found in the brains of patients with Alzheimer disease. In addition, two of the peptides are antimicrobial peptides, having been shown to have bacteriocidal and antifungal activities. Mutations in this gene have been implicated in autosomal dominant Alzheimer disease and cerebroarterial amyloidosis (cerebral amyloid angiopathy). Multiple transcript variants encoding several different isoforms have been found for this gene. [provided by RefSeq, Aug 2014]

APP Gene-Disease associations (from GenCC):

• Alzheimer disease type 1

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• cerebral amyloid angiopathy, APP-related

  Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp
• ABeta amyloidosis, Arctic type

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ABeta amyloidosis, dutch type

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ABeta amyloidosis, Iowa type

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ABeta amyloidosis, Italian type

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ABetaA21G amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• ABetaL34V amyloidosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• early-onset autosomal dominant Alzheimer disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

LOC124900466 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -8 ACMG points.

• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.994 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
APP	NM_000484.4	c.58-18959G>A		intron_variant	Intron 1 of 17	ENST00000346798.8	NP_000475.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
APP	ENST00000346798.8	c.58-18959G>A		intron_variant	Intron 1 of 17	1	NM_000484.4	ENSP00000284981.4

Frequencies

GnomAD3 genomes AF: 1.00 AC: 152046 AN: 152046 Hom.: 76023 Cov.: 30

Gnomad AFR AF: 1.00

Gnomad AMI AF: 1.00

Gnomad AMR AF: 1.00

Gnomad ASJ AF: 1.00

Gnomad EAS AF: 1.00

Gnomad SAS AF: 1.00

Gnomad FIN AF: 1.00

Gnomad MID AF: 1.00

Gnomad NFE AF: 1.00

Gnomad OTH AF: 1.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 1.00 AC: 152164 AN: 152164 Hom.: 76082 Cov.: 30 AF XY: 1.00 AC XY: 74382 AN XY: 74382

African (AFR) AF: 1.00 AC: 41500 AN: 41500

American (AMR) AF: 1.00 AC: 15280 AN: 15280

Ashkenazi Jewish (ASJ) AF: 1.00 AC: 3472 AN: 3472

East Asian (EAS) AF: 1.00 AC: 5174 AN: 5174

South Asian (SAS) AF: 1.00 AC: 4816 AN: 4816

European-Finnish (FIN) AF: 1.00 AC: 10592 AN: 10592

Middle Eastern (MID) AF: 1.00 AC: 294 AN: 294

European-Non Finnish (NFE) AF: 1.00 AC: 68020 AN: 68020

Other (OTH) AF: 1.00 AC: 2104 AN: 2104

Alfa AF: 1.00 Hom.: 9260

Bravo AF: 1.00

Asia WGS AF: 1.00 AC: 3478 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	1.2
DANN	Benign	0.21
PhyloP100		-0.92
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.24		Position offset: -1

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

Other links and lift over

dbSNP: rs380662; hg19: chr21-27503422;