chr16-88810550-T-A

Position:

• chr16-88810550-T-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The NM_000485.3(APRT):​c.194A>T​(p.Asp65Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000754 in 1,459,136 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 Pathogenic (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: APRT NM_000485.3 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 5.58

Genes affected

APRT (HGNC:626): (adenine phosphoribosyltransferase) Adenine phosphoribosyltransferase belongs to the purine/pyrimidine phosphoribosyltransferase family. A conserved feature of this gene is the distribution of CpG dinucleotides. This enzyme catalyzes the formation of AMP and inorganic pyrophosphate from adenine and 5-phosphoribosyl-1-pyrophosphate (PRPP). It also produces adenine as a by-product of the polyamine biosynthesis pathway. A homozygous deficiency in this enzyme causes 2,8-dihydroxyadenine urolithiasis. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PM1: In a chain Adenine phosphoribosyltransferase (size 178) in uniprot entity APT_HUMAN there are 22 pathogenic changes around while only 1 benign (96%) in NM_000485.3
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 16-88810550-T-A is Pathogenic according to our data. Variant chr16-88810550-T-A is described in ClinVar as [Pathogenic]. Clinvar id is 18297.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chr16-88810550-T-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
APRT	NM_000485.3	c.194A>T	p.Asp65Val	missense_variant	3/5	ENST00000378364.8	NP_000476.1
APRT	NM_001030018.2	c.194A>T	p.Asp65Val	missense_variant	3/5		NP_001025189.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
APRT	ENST00000378364.8	c.194A>T	p.Asp65Val	missense_variant	3/5	1	NM_000485.3	ENSP00000367615	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000754 AC: 11 AN: 1459136 Hom.: 0 Cov.: 32 AF XY: 0.00000827 AC XY: 6 AN XY: 725728

Gnomad4 AFR exome AF: 0.0000299

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: 0.00000810

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 33

Alfa AF: 0.000224 Hom.: 0

ExAC AF: 0.00000827 AC: 1

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Adenine phosphoribosyltransferase deficiency Pathogenic:2 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Sep 18, 2013	- -
not provided, no classification provided	literature only	GeneReviews	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	APRT Deficiency Research Program of the Rare Kidney Stone Consortium, Landspitali, National University Hospital of Iceland	Sep 01, 2020	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.90	D;.;.
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.39
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Pathogenic	0.90	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.4	M;.;M
MutationTaster	Benign	1.0	A;A;A
PrimateAI	Uncertain	0.64	T
PROVEAN	Pathogenic	-6.4	D;D;D
REVEL	Pathogenic	0.93
Sift	Pathogenic	0.0	D;D;D
Sift4G	Uncertain	0.0040	D;.;D
Polyphen		0.98	D;.;.
Vest4		0.96
MutPred		0.93		Loss of catalytic residue at D65 (P = 0.0603);Loss of catalytic residue at D65 (P = 0.0603);Loss of catalytic residue at D65 (P = 0.0603);
MVP		0.94
MPC		0.70
ClinPred		0.99	D
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.96
gMVP		0.87

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs104894506; hg19: chr16-88876958;