chr21-25905573-T-C

Position:

• chr21-25905573-T-C

Variant summary

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

The NM_000484.4(APP):​c.1910-496A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.876 in 152,228 control chromosomes in the GnomAD database, including 58,550 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 0.88 (58550 hom., cov: 33)
• Consequence: APP NM_000484.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.711

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=-0.88).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.903 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
APP	NM_000484.4	c.1910-496A>G		intron_variant		ENST00000346798.8	NP_000475.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
APP	ENST00000346798.8	c.1910-496A>G		intron_variant		1	NM_000484.4	ENSP00000284981.4

Frequencies

GnomAD3 genomes AF: 0.876 AC: 133279 AN: 152112 Hom.: 58520 Cov.: 33

Gnomad AFR AF: 0.824

Gnomad AMI AF: 0.857

Gnomad AMR AF: 0.895

Gnomad ASJ AF: 0.909

Gnomad EAS AF: 0.806

Gnomad SAS AF: 0.884

Gnomad FIN AF: 0.868

Gnomad MID AF: 0.873

Gnomad NFE AF: 0.909

Gnomad OTH AF: 0.876

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

GnomAD4 genome AF: 0.876 AC: 133357 AN: 152228 Hom.: 58550 Cov.: 33 AF XY: 0.874 AC XY: 65055 AN XY: 74418

Gnomad4 AFR AF: 0.823

Gnomad4 AMR AF: 0.895

Gnomad4 ASJ AF: 0.909

Gnomad4 EAS AF: 0.805

Gnomad4 SAS AF: 0.885

Gnomad4 FIN AF: 0.868

Gnomad4 NFE AF: 0.909

Gnomad4 OTH AF: 0.876

Alfa AF: 0.893 Hom.: 10091

Bravo AF: 0.874

Asia WGS AF: 0.872 AC: 3036 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	9.2
DANN	Benign	0.73

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1787439; hg19: chr21-27277885;