21-25887702-C-T

Position:

• chr21-25887702-C-T

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000484.4(APP):​c.2211+4020G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0794 in 152,024 control chromosomes in the GnomAD database, including 639 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 0.079 (639 hom., cov: 32)
• Consequence: APP NM_000484.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.195

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.119 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
APP	NM_000484.4	c.2211+4020G>A		intron_variant		ENST00000346798.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
APP	ENST00000346798.8	c.2211+4020G>A		intron_variant		1	NM_000484.4

Frequencies

GnomAD3 genomes AF: 0.0794 AC: 12063 AN: 151906 Hom.: 639 Cov.: 32

Gnomad AFR AF: 0.0201

Gnomad AMI AF: 0.241

Gnomad AMR AF: 0.0658

Gnomad ASJ AF: 0.0629

Gnomad EAS AF: 0.00116

Gnomad SAS AF: 0.0604

Gnomad FIN AF: 0.0980

Gnomad MID AF: 0.114

Gnomad NFE AF: 0.122

Gnomad OTH AF: 0.0789

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

GnomAD4 genome AF: 0.0794 AC: 12064 AN: 152024 Hom.: 639 Cov.: 32 AF XY: 0.0769 AC XY: 5712 AN XY: 74284

Gnomad4 AFR AF: 0.0200

Gnomad4 AMR AF: 0.0657

Gnomad4 ASJ AF: 0.0629

Gnomad4 EAS AF: 0.00135

Gnomad4 SAS AF: 0.0611

Gnomad4 FIN AF: 0.0980

Gnomad4 NFE AF: 0.122

Gnomad4 OTH AF: 0.0781

Alfa AF: 0.0379 Hom.: 43

Bravo AF: 0.0740

Asia WGS AF: 0.0320 AC: 112 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	3.9
DANN	Benign	0.74

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

Publications

LitVar

Other links and lift over

dbSNP: rs1145; hg19: chr21-27260014;