21-26171136-G-A

Variant names:

• chr21-26171136-G-A
• rs539645405
• ENST00000717652.1:n.229G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000717652.1(APP-DT):​n.229G>A variant causes a non coding transcript exon 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.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: APP-DT ENST00000717652.1 non_coding_transcript_exon
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.548
• Publications: 0 publications found

Genes affected

APP-DT (HGNC:55075): (APP divergent transcript)

ENSG00000224541 (HGNC:):

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):

• cerebral amyloid angiopathy, APP-related

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• Alzheimer disease type 1

  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

ACMG classification

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

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.28).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000717652.1. 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
	APP-DT	NR_186395.1		n.186+84G>A		intron	N/A
	APP-DT	NR_186396.1		n.186+84G>A		intron	N/A
	APP	NM_001136131.3		c.-200C>T		upstream_gene	N/A	NP_001129603.1	A0A0A0MRG2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	APP-DT	ENST00000717652.1		n.229G>A		non_coding_transcript_exon	Exon 1 of 3
	APP-DT	ENST00000735794.1		n.248G>A		non_coding_transcript_exon	Exon 1 of 2
	ENSG00000224541	ENST00000455275.1	TSL:2	n.178-4474G>A		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 732 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 370

African (AFR) AF: 0.00 AC: 0 AN: 34

American (AMR) AF: 0.00 AC: 0 AN: 14

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 38

East Asian (EAS) AF: 0.00 AC: 0 AN: 46

South Asian (SAS) AF: 0.00 AC: 0 AN: 6

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 28

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 522

Other (OTH) AF: 0.00 AC: 0 AN: 40

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000529 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.28
CADD	Benign	16
DANN	Uncertain	0.99
PhyloP100		0.55
PromoterAI		-0.21	Neutral

Splicing

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

Other links and lift over

dbSNP: rs539645405; hg19: chr21-27543454;