chr14-31066201-T-TA

Variant names:

• chr14-31066201-T-TA
• NM_001128126.3:c.9dupA

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_001128126.3(AP4S1):​c.9dupA​(p.Phe4IlefsTer7) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: AP4S1 NM_001128126.3 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.938
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• AP-4 deficiency syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 52

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• AP4-related intellectual disability and spastic paraplegia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 13 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 14-31066201-T-TA is Pathogenic according to our data. Variant chr14-31066201-T-TA is described in ClinVar as Pathogenic. ClinVar VariationId is 2732953.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001128126.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AP4S1	NM_001128126.3	MANE Select	c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 2 of 6	NP_001121598.1	Q9Y587-1
	AP4S1	NM_007077.5		c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 2 of 6	NP_009008.2
	AP4S1	NM_001254727.2		c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 2 of 7	NP_001241656.1	Q9Y587-4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	AP4S1	ENST00000542754.7	TSL:1 MANE Select	c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 2 of 6	ENSP00000438170.2	Q9Y587-1
	AP4S1	ENST00000334725.8	TSL:1	c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 2 of 7	ENSP00000334484.4	Q9Y587-4
	AP4S1	ENST00000216366.9	TSL:1	c.9dupA	p.Phe4IlefsTer7	frameshift	Exon 1 of 5	ENSP00000216366.5	A0A8C8KBR5

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Spastic paraplegia (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.94

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

Other links and lift over

hg19: chr14-31535407; COSMIC: COSV53554807; COSMIC: COSV53554807;