rs566333309

chr7-4787656-C-T

Variant summary

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

The NM_014855.3(AP5Z1):c.1334C>T(p.Pro445Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000197 in 1,553,290 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00020 (0 hom.)
• Consequence: AP5Z1 NM_014855.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 4.40

Genes affected

AP5Z1 (HGNC:22197): (adaptor related protein complex 5 subunit zeta 1) This gene was identified by genome-wide screen for genes involved in homologous recombination DNA double-strand break repair (HR-DSBR). The encoded protein was found in a complex with other proteins that have a role in HR-DSBR. Knockdown of this gene reduced homologous recombination, and mutations in this gene were found in patients with spastic paraplegia. It was concluded that this gene likely encodes a helicase (PMID:20613862). [provided by RefSeq, Jan 2011]

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 (MetaRNN=0.009223163).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AP5Z1	NM_014855.3	c.1334C>T	p.Pro445Leu	missense_variant	11/17	ENST00000649063.2
AP5Z1	NM_001364858.1	c.866C>T	p.Pro289Leu	missense_variant	10/16
AP5Z1	XM_047421098.1	c.998C>T	p.Pro333Leu	missense_variant	9/15
AP5Z1	NR_157345.1	n.1465C>T		non_coding_transcript_exon_variant	11/17

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AP5Z1	ENST00000649063.2	c.1334C>T	p.Pro445Leu	missense_variant	11/17		NM_014855.3	P1

Frequencies

GnomAD3 genomes AF: 0.000131 AC: 20 AN: 152174 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00328

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000170 AC: 27 AN: 158414 Hom.: 0 AF XY: 0.000131 AC XY: 11 AN XY: 84234

Gnomad AFR exome AF: 0.000119

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00228

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.000204 AC: 286 AN: 1400998 Hom.: 0 Cov.: 31 AF XY: 0.000208 AC XY: 144 AN XY: 691488

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00728

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000120

Gnomad4 OTH exome AF: 0.000189

GnomAD4 genome AF: 0.000131 AC: 20 AN: 152292 Hom.: 0 Cov.: 32 AF XY: 0.000134 AC XY: 10 AN XY: 74460

Gnomad4 AFR AF: 0.0000481

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00329

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Alfa AF: 0.0000712 Hom.: 0

Bravo AF: 0.000113

ExAC AF: 0.0000733 AC: 8

Asia WGS AF: 0.000577 AC: 2 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary spastic paraplegia 48 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Aug 23, 2022	This sequence change replaces proline, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 445 of the AP5Z1 protein (p.Pro445Leu). This variant is present in population databases (rs566333309, gnomAD 0.2%). This variant has not been reported in the literature in individuals affected with AP5Z1-related conditions. ClinVar contains an entry for this variant (Variation ID: 360326). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant is not likely to affect RNA splicing. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.43	T
BayesDel_noAF	Benign	-0.40
Cadd	Benign	23
Dann	Uncertain	0.98
DEOGEN2	Benign	0.087	T;T
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.20
FATHMM_MKL	Uncertain	0.86	D
M_CAP	Benign	0.052	D
MetaRNN	Benign	0.0092	T;T
MetaSVM	Benign	-0.72	T
MutationAssessor	Uncertain	2.0	M;M
MutationTaster	Benign	0.54	D;D
PrimateAI	Benign	0.31	T
PROVEAN	Uncertain	-2.9	D;.
REVEL	Benign	0.093
Sift	Benign	0.060	T;.
Sift4G	Benign	0.068	T;.
Polyphen		0.13	B;B
Vest4		0.43
MutPred		0.29		Loss of glycosylation at P445 (P = 0.0227);Loss of glycosylation at P445 (P = 0.0227);
MVP		0.25
ClinPred		0.073	T
GERP RS		5.0
Varity_R		0.058
gMVP		0.45

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs566333309; hg19: chr7-4827287;