rs876661295

Positions:

chr14-31066332-CAAGT-C

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The ENST00000542754.7(AP4S1):c.137_138+2delAAGT(p.Gln46fs) variant causes a frameshift, splice donor, splice region, intron change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000806 in 1,613,854 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

AP4S1
ENST00000542754.7 frameshift, splice_donor, splice_region, intron

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:13O:1

Conservation

PhyloP100: 8.35

Variant links:

Genes affected

AP4S1 (HGNC:575): (adaptor related protein complex 4 subunit sigma 1) This gene encodes a member of the adaptor complexes small subunit protein family. These proteins are components of the heterotetrameric adaptor protein complexes, which play important roles in the secretory and endocytic pathways by mediating vesicle formation and sorting of integral membrane proteins. The encoded protein is the small subunit of adaptor protein complex-4, which is associated with both clathrin- and nonclathrin-coated vesicles. Mutations in this gene are associated with spastic quadriplegic cerebral palsy-6. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene, and a pseudogene of this gene is located on the long arm of chromosome 6. [provided by RefSeq, Dec 2011]

AP4S1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 14-31066332-CAAGT-C is Pathogenic according to our data. Variant chr14-31066332-CAAGT-C is described in ClinVar as [Pathogenic]. Clinvar id is 234925.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr14-31066332-CAAGT-C is described in Lovd as [Pathogenic]. Variant chr14-31066332-CAAGT-C is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
AP4S1	NM_001128126.3 link	c.138+3_138+6delAAGT		splice_region_variant, intron_variant		ENST00000542754.7	NP_001121598.1	Q9Y587-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
AP4S1	ENST00000542754.7 link	c.137_138+2delAAGT	p.Gln46fs	frameshift_variant, splice_donor_variant, splice_region_variant, intron_variant	2/6	1	NM_001128126.3	ENSP00000438170.2		Q9Y587-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

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:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251148

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135812

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

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:

0.0000352

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000821

AC:

AN:

1461654

Hom.:

AF XY:

0.0000124

AC XY:

AN XY:

727126

show subpopulations

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:

0.0000108

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74342

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

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:

0.00

Bravo

AF:

0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:13Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Spastic paraplegia 52, autosomal recessive

Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jan 14, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics Munich, Klinikum Rechts Der Isar, TU München	Dec 07, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Equipe Genetique des Anomalies du Developpement, Université de Bourgogne	Oct 28, 2021	- -
Pathogenic, no assertion criteria provided	literature only	OMIM	Jun 21, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory of Medical Genetics, National & Kapodistrian University of Athens	Jan 24, 2022	PM2, PP3, PP5 -

not provided

Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Oct 01, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Clinical Genetics Laboratory, Skane University Hospital Lund	May 27, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Mar 24, 2023	Non-canonical splice site variant demonstrated to result in loss-of-function as mRNA levels were virtually absent in the samples from affected individuals homozygous for c.1383_138+6delAAGT (Tessa et al., 2016); Not observed at a significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 31915823, 30293248, 27444738, 28150420, 25552650, 30552426) -

Spastic paraplegia

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 05, 2023

This sequence change falls in intron 2 of the AP4S1 gene. It does not directly change the encoded amino acid sequence of the AP4S1 protein. It affects a nucleotide within the consensus splice site. This variant is present in population databases (rs758873371, gnomAD 0.004%). For these reasons, this variant has been classified as Pathogenic. Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 234925). This variant is also known as c.137_140delAAGT. This variant has been observed in individual(s) with AP4S1-related conditions (PMID: 25552650, 27444738, 28150420). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. -

Inborn genetic diseases

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 15, 2021

The c.138+3_138+6delAAGT intronic variant, also known as c.137_140delAAGT, is located 3 nucleotides after coding exon 1 in the AP4S1 gene. This variant results from a deletion of 4 nucleotides at positions c.138+3 to c.138+6. The stop codon in the predicted resulting transcript occurs in the 5' end of the AP4S1 gene. As such, this alteration may escape nonsense-mediated mRNA decay and/or be prone to rescue by reinitation (Rivas, 2015; Lindeboom, 2016; Rhee, 2017). The exact functional effect of this alteration is unknown; however, the impacted region is critical for protein function and a significant portion of the protein is affected (Ambry internal data). Based on data from the Genome Aggregation Database (gnomAD) database, the AP4S1 c.138+3_138+6delAAGT alteration was observed in <0.01% (4/251148) of total alleles studied, with a frequency of <0.01% (4/113592) in the European (non-Finnish) subpopulation. This variant was detected as homozygous and compound heterozygous in multiple individuals with spastic paraplegia, intellectual disability, early-onset seizures, and other neurological findings consistent with AP4S1-related spastic parapelgia (Hardies, 2015; Tessa, 2016; Vill, 2017; Papuc, 2019). This nucleotide region is well conserved in available vertebrate species. In silico splice site analysis predicts that this alteration will weaken the native splice donor site. Based on the available evidence, this alteration is classified as pathogenic. -

Neurodevelopmental disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Laboratory of Molecular Genetics (Pr. Bezieau's lab), CHU de Nantes

Feb 24, 2021

- -

Intellectual disability

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Diagnostic Laboratory, Strasbourg University Hospital

Sep 10, 2020

- -

APS41-related disorder

Other:1

not provided, no classification provided

phenotyping only

GenomeConnect, ClinGen

Variant interpretted as Pathogenic and reported on 04-16-2018 by Lab or GTR ID 26957. GenomeConnect assertions are reported exactly as they appear on the patient-provided report from the testing laboratory. GenomeConnect staff make no attempt to reinterpret the clinical significance of the variant. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

1.0

Details are displayed if max score is > 0.2

DS_DL_spliceai

1.0

Position offset: 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