14-31026088-C-G

Variant names:

• chr14-31026088-C-G
• rs1378637885
• NM_001083893.2:c.98G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001083893.2(STRN3):​c.98G>C​(p.Gly33Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000145 in 1,376,936 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G33E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 0.0000015 (0 hom.)
• Consequence: STRN3 NM_001083893.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.26
• Publications: 0 publications found

Genes affected

STRN3 (HGNC:15720): (striatin 3) Enables armadillo repeat domain binding activity; protein phosphatase 2A binding activity; and small GTPase binding activity. Involved in negative regulation of transcription by RNA polymerase II and positive regulation of transcription by RNA polymerase II. Located in Golgi apparatus; nucleoplasm; and plasma membrane. Part of FAR/SIN/STRIPAK complex. [provided by Alliance of Genome Resources, Apr 2022]

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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22577456).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001083893.2. 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
	STRN3	NM_001083893.2	MANE Select	c.98G>C	p.Gly33Ala	missense	Exon 1 of 18	NP_001077362.1	Q13033-1
	AP4S1	NM_001128126.3	MANE Select	c.-72+301C>G		intron	N/A	NP_001121598.1	Q9Y587-1
	STRN3	NM_014574.4		c.98G>C	p.Gly33Ala	missense	Exon 1 of 16	NP_055389.3

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	STRN3	ENST00000357479.10	TSL:5 MANE Select	c.98G>C	p.Gly33Ala	missense	Exon 1 of 18	ENSP00000350071.5	Q13033-1
	STRN3	ENST00000355683.9	TSL:1	c.98G>C	p.Gly33Ala	missense	Exon 1 of 16	ENSP00000347909.5	Q13033-2
	AP4S1	ENST00000542754.7	TSL:1 MANE Select	c.-72+301C>G		intron	N/A	ENSP00000438170.2	Q9Y587-1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD2 exomes AF: 0.00000821 AC: 1 AN: 121842 AF XY: 0.0000149

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000145 AC: 2 AN: 1376936 Hom.: 0 Cov.: 31 AF XY: 0.00000295 AC XY: 2 AN XY: 678780

African (AFR) AF: 0.00 AC: 0 AN: 28890

American (AMR) AF: 0.0000291 AC: 1 AN: 34362

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24174

East Asian (EAS) AF: 0.00 AC: 0 AN: 33498

South Asian (SAS) AF: 0.0000128 AC: 1 AN: 78064

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 45482

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4642

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1070762

Other (OTH) AF: 0.00 AC: 0 AN: 57062

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.068
BayesDel_addAF	Benign	-0.078	T
BayesDel_noAF	Benign	-0.21
CADD	Benign	15
DANN	Benign	0.95
DEOGEN2	Benign	0.019	T
Eigen	Benign	-0.60
Eigen_PC	Benign	-0.52
FATHMM_MKL	Benign	0.053	N
LIST_S2	Benign	0.69	T
M_CAP	Pathogenic	0.92	D
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.40	T
MutationAssessor	Benign	1.6	L
PhyloP100		1.3
PrimateAI	Pathogenic	0.91	D
PROVEAN	Benign	-0.38	N
REVEL	Benign	0.13
Sift	Benign	0.11	T
Sift4G	Benign	0.31	T
Polyphen		0.0	B
Vest4		0.32
MutPred		0.22		Gain of catalytic residue at L30 (P = 0.0013)
MVP		0.75
MPC		1.6
ClinPred		0.12	T
GERP RS		3.8
PromoterAI		-0.022	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.049
gMVP		0.68
Mutation Taster		=95/5	polymorphism

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

dbSNP: rs1378637885; hg19: chr14-31495294;