rs754944429

Variant names:

• chr15-50997722-C-CTATGT
• rs754944429
• NM_007347.5:c.2743_2744insTATGT

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PVS1 PP5_Moderate

The NM_007347.5(AP4E1):​c.2743_2744insTATGT​(p.His915LeufsTer29) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000547 in 1,461,652 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: AP4E1 NM_007347.5 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.29

Genes affected

AP4E1 (HGNC:573): (adaptor related protein complex 4 subunit epsilon 1) This gene encodes a member of the adaptor complexes large 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 a large subunit of adaptor protein complex-4, which is associated with both clathrin- and nonclathrin-coated vesicles. Disruption of this gene may be associated with cerebral palsy. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2011]

ACMG classification

Verdict is Pathogenic. Variant got 10 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PP5: Variant 15-50997722-C-CTATGT is Pathogenic according to our data. Variant chr15-50997722-C-CTATGT is described in ClinVar as [Pathogenic]. Clinvar id is 569155.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
AP4E1	NM_007347.5	c.2743_2744insTATGT	p.His915LeufsTer29	frameshift_variant	Exon 18 of 21	ENST00000261842.10	NP_031373.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
AP4E1	ENST00000261842.10	c.2743_2744insTATGT	p.His915LeufsTer29	frameshift_variant	Exon 18 of 21	1	NM_007347.5	ENSP00000261842.5
AP4E1	ENST00000560508.1	c.2518_2519insTATGT	p.His840LeufsTer29	frameshift_variant	Exon 18 of 21	1		ENSP00000452976.1
AP4E1	ENST00000558439.5	n.*1867_*1868insTATGT		non_coding_transcript_exon_variant	Exon 18 of 21	1		ENSP00000452712.1
AP4E1	ENST00000561393.5	n.*1787_*1788insTATGT		non_coding_transcript_exon_variant	Exon 17 of 20	1		ENSP00000452711.1
AP4E1	ENST00000558439.5	n.*1867_*1868insTATGT		3_prime_UTR_variant	Exon 18 of 21	1		ENSP00000452712.1
AP4E1	ENST00000561393.5	n.*1787_*1788insTATGT		3_prime_UTR_variant	Exon 17 of 20	1		ENSP00000452711.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000319 AC: 8 AN: 250948 Hom.: 0 AF XY: 0.0000147 AC XY: 2 AN XY: 135654

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000232

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: 0.00

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461652 Hom.: 0 Cov.: 31 AF XY: 0.00000275 AC XY: 2 AN XY: 727124

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000179

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: 0.000128

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Spastic paraplegia Pathogenic:1

Nov 27, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.His915Leufs*29) in the AP4E1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in AP4E1 are known to be pathogenic (PMID: 21620353, 21937992, 23472171). This variant is present in population databases (rs754944429, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with AP4E1-related conditions. ClinVar contains an entry for this variant (Variation ID: 569155). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs754944429; hg19: chr15-51289919;