2-74529646-G-A

Variant names:

• chr2-74529646-G-A
• rs757541077
• NM_181575.5:c.-17C>T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_181575.5(AUP1):​c.-17C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000452 in 1,552,318 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00039 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00046 (0 hom.)
• Consequence: AUP1 NM_181575.5 5_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -2.45

Genes affected

AUP1 (HGNC:891): (AUP1 lipid droplet regulating VLDL assembly factor) The protein encoded this gene is involved in several pathways including quality control of misfolded proteins in the endoplasmic reticulum and lipid droplet accumulation. Lipid droplets are organelles in the cytoplasm that store neutral lipids such as cholesterol esters and trigylycerides to prevent the overabundance of free cholesterol and fatty acids in cells, but also to act as storage for other metabolic processes, such as membrane biogenesis. Reduced expression of this gene results in reduced lipid droplet clustering, a function that is dependent on ubiquitination of the protein. This protein contains multiple domains including a hydrophobic N-terminal domain, an acetyltranferase domain, a ubiquitin-binding CUE domain, and a UBE2B2-binding domain (G2BR). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2014]

HTRA2 (HGNC:14348): (HtrA serine peptidase 2) This gene encodes a serine protease. The protein has been localized in the endoplasmic reticulum and interacts with an alternatively spliced form of mitogen-activated protein kinase 14. The protein has also been localized to the mitochondria with release to the cytosol following apoptotic stimulus. The protein is thought to induce apoptosis by binding the apoptosis inhibitory protein baculoviral IAP repeat-containing 4. Nuclear localization of this protein has also been observed. Alternate splicing of this gene results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2016]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AUP1	NM_181575.5	c.-17C>T		5_prime_UTR_variant	Exon 1 of 12	ENST00000377526.4	NP_853553.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AUP1	ENST00000377526.4	c.-17C>T		5_prime_UTR_variant	Exon 1 of 12	1	NM_181575.5	ENSP00000366748.3

Frequencies

GnomAD3 genomes AF: 0.000388 AC: 59 AN: 152236 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000145

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000523

Gnomad ASJ AF: 0.000576

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.000565

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000544

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000473 AC: 71 AN: 150194 Hom.: 0 AF XY: 0.000478 AC XY: 39 AN XY: 81666

Gnomad AFR exome AF: 0.000263

Gnomad AMR exome AF: 0.000397

Gnomad ASJ exome AF: 0.00156

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.000429

Gnomad NFE exome AF: 0.000700

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000459 AC: 642 AN: 1399964 Hom.: 0 Cov.: 33 AF XY: 0.000460 AC XY: 318 AN XY: 691506

Gnomad4 AFR exome AF: 0.0000625

Gnomad4 AMR exome AF: 0.000328

Gnomad4 ASJ exome AF: 0.00147

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.000535

Gnomad4 NFE exome AF: 0.000499

Gnomad4 OTH exome AF: 0.000448

GnomAD4 genome AF: 0.000387 AC: 59 AN: 152354 Hom.: 0 Cov.: 33 AF XY: 0.000376 AC XY: 28 AN XY: 74498

Gnomad4 AFR AF: 0.000144

Gnomad4 AMR AF: 0.000523

Gnomad4 ASJ AF: 0.000576

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.000565

Gnomad4 NFE AF: 0.000544

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000555 Hom.: 0

Bravo AF: 0.000336

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Parkinson disease 13, autosomal dominant, susceptibility to Uncertain:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. However, the evidence from the literature, in combination with allele frequency data from public databases where available, was not sufficient to rule this variant in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	2.6
DANN	Benign	0.80
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

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: rs757541077; hg19: chr2-74756773;