10-71819521-T-A

Position:

chr10-71819521-T-A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 1P and 5B. PP3BS1_SupportingBS2

The ENST00000394936.8(PSAP):c.1294A>T(p.Ile432Phe) variant causes a missense change. The variant allele was found at a frequency of 0.000044 in 1,614,182 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. I432I) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.00024 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000024 ( 0 hom. )

Consequence

PSAP
ENST00000394936.8 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 4.70

Variant links:

Genes affected

PSAP (HGNC:9498): (prosaposin) This gene encodes a highly conserved preproprotein that is proteolytically processed to generate four main cleavage products including saposins A, B, C, and D. Each domain of the precursor protein is approximately 80 amino acid residues long with nearly identical placement of cysteine residues and glycosylation sites. Saposins A-D localize primarily to the lysosomal compartment where they facilitate the catabolism of glycosphingolipids with short oligosaccharide groups. The precursor protein exists both as a secretory protein and as an integral membrane protein and has neurotrophic activities. Mutations in this gene have been associated with Gaucher disease and metachromatic leukodystrophy. Alternative splicing results in multiple transcript variants, at least one of which encodes an isoform that is proteolytically processed. [provided by RefSeq, Feb 2016]

PSAP links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.824

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.000236 (36/152292) while in subpopulation AMR AF= 0.00216 (33/15304). AF 95% confidence interval is 0.00158. There are 0 homozygotes in gnomad4. There are 24 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAd4 at 36 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
PSAP	NM_002778.4 linkuse as main transcript	c.1294A>T	p.Ile432Phe	missense_variant	11/14	ENST00000394936.8	NP_002769.1
PSAP	NM_001042465.3 linkuse as main transcript	c.1303A>T	p.Ile435Phe	missense_variant	12/15		NP_001035930.1
PSAP	NM_001042466.3 linkuse as main transcript	c.1300A>T	p.Ile434Phe	missense_variant	12/15		NP_001035931.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PSAP	ENST00000394936.8 linkuse as main transcript	c.1294A>T	p.Ile432Phe	missense_variant	11/14	1	NM_002778.4	ENSP00000378394	P1	P07602-1

Frequencies

GnomAD3 genomes

AF:

0.000243

AC:

AN:

152174

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00222

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000957

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251490

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000239

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.0000206

AC XY:

AN XY:

727244

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000537

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.000182

GnomAD4 genome

AF:

0.000236

AC:

AN:

152292

Hom.:

Cov.:

AF XY:

0.000322

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00216

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000947

Bravo

AF:

0.000676

ExAC

AF:

0.0000247

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

May 20, 2022

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Sphingolipid activator protein 1 deficiency

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 25, 2022

This sequence change replaces isoleucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 432 of the PSAP protein (p.Ile432Phe). This variant is present in population databases (rs532242066, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with PSAP-related conditions. ClinVar contains an entry for this variant (Variation ID: 578184). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt PSAP protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Metachromatic leukodystrophy

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

Oct 28, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.65

BayesDel_addAF

Pathogenic

0.27

BayesDel_noAF

Pathogenic

0.38

CADD

Pathogenic

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.96

D;D;D

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.89

D;D;D

M_CAP

Pathogenic

0.40

MetaRNN

Pathogenic

0.82

D;D;D

MetaSVM

Pathogenic

1.0

MutationAssessor

Pathogenic

3.1

M;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-3.6

D;.;.

REVEL

Pathogenic

0.89

Sift

Uncertain

0.0010

D;.;.

Sift4G

Pathogenic

0.0

D;D;D

Polyphen

1.0

D;.;.

Vest4

0.78

MutPred

0.79

Gain of disorder (P = 0.1602);.;.;

MVP

0.85

MPC

0.35

ClinPred

0.69

GERP RS

5.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.82

gMVP

0.87

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over