17-76353537-G-T

Position:

• chr17-76353537-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_002766.3(PRPSAP1):​c.167C>A​(p.Thr56Lys) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: PRPSAP1 NM_002766.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.23

Genes affected

PRPSAP1 (HGNC:9466): (phosphoribosyl pyrophosphate synthetase associated protein 1) Enables identical protein binding activity. Predicted to be involved in 5-phosphoribose 1-diphosphate biosynthetic process and purine nucleotide biosynthetic process. Predicted to be part of ribose phosphate diphosphokinase complex. Predicted to be active in cytoplasm. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.846

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PRPSAP1	NM_002766.3	c.167C>A	p.Thr56Lys	missense_variant	1/10	ENST00000446526.8
PRPSAP1	NM_001330503.2	c.-76C>A		5_prime_UTR_variant	1/9
PRPSAP1	NM_001366236.2	c.-140+580C>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PRPSAP1	ENST00000446526.8	c.167C>A	p.Thr56Lys	missense_variant	1/10	1	NM_002766.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1377274 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 680662

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 07, 2023

The c.167C>A (p.T56K) alteration is located in exon 1 (coding exon 1) of the PRPSAP1 gene. This alteration results from a C to A substitution at nucleotide position 167, causing the threonine (T) at amino acid position 56 to be replaced by a lysine (K). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	27
DANN	Uncertain	0.99
Eigen	Uncertain	0.32
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Benign	0.67	D
LIST_S2	Uncertain	0.95	D
M_CAP	Pathogenic	0.64	D
MetaRNN	Pathogenic	0.85	D
MetaSVM	Uncertain	0.42	D
MutationTaster	Benign	1.0	D;D
PrimateAI	Pathogenic	0.92	D
PROVEAN	Benign	-1.8	N
REVEL	Pathogenic	0.74
Sift	Uncertain	0.0030	D
Sift4G	Uncertain	0.0080	D
Polyphen		0.55	P
Vest4		0.77
MVP		0.67
MPC		0.55
ClinPred		0.62	D
GERP RS		4.5
gMVP		0.68

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: rs1443844622; hg19: chr17-74349618;