chr1-151612215-A-C

Variant names:

• chr1-151612215-A-C
• rs1667204535
• NM_001330723.2:c.14A>C

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_Moderate BS2

The NM_001330723.2(SNX27):​c.14A>C​(p.Asp5Ala) variant causes a missense change. The variant allele was found at a frequency of 0.0000125 in 1,204,072 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D5E) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000012 (0 hom.)
• Consequence: SNX27 NM_001330723.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.66

Genes affected

SNX27 (HGNC:20073): (sorting nexin 27) This gene encodes a member of the sorting nexin family, a diverse group of cytoplasmic and membrane-associated proteins involved in endocytosis of plasma membrane receptors and protein trafficking through these compartments. All members of this protein family contain a phosphoinositide binding domain (PX domain). A highly similar protein in mouse is responsible for the specific recruitment of an isoform of serotonin 5-hydroxytryptamine 4 receptor into early endosomes, suggesting the analogous role for the human protein. [provided by RefSeq, Jul 2008]

ENSG00000250734 (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -6 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.19556883).
• BS2: High AC in GnomAdExome4 at 15 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNX27	NM_001330723.2	c.14A>C	p.Asp5Ala	missense_variant	Exon 1 of 12	ENST00000458013.7	NP_001317652.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNX27	ENST00000458013.7	c.14A>C	p.Asp5Ala	missense_variant	Exon 1 of 12	5	NM_001330723.2	ENSP00000400333.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.0000125 AC: 15 AN: 1204072 Hom.: 0 Cov.: 31 AF XY: 0.0000137 AC XY: 8 AN XY: 582382

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: 0.0000152

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Severe myoclonic epilepsy in infancy Uncertain:1

Sep 24, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces aspartic acid with alanine at codon 5 of the SNX27 protein (p.Asp5Ala). The aspartic acid residue is moderately conserved and there is a moderate physicochemical difference between aspartic acid and alanine. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This variant has not been reported in the literature in individuals affected with SNX27-related conditions. 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"). 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	0.073
BayesDel_addAF	Benign	-0.052	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	23
DANN	Uncertain	0.98
DEOGEN2	Benign	0.13	.;.;T
Eigen	Benign	-0.38
Eigen_PC	Benign	-0.21
FATHMM_MKL	Benign	0.63	D
LIST_S2	Benign	0.65	T;T;T
M_CAP	Pathogenic	0.61	D
MetaRNN	Benign	0.20	T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.0	.;N;N
PrimateAI	Pathogenic	0.88	D
PROVEAN	Benign	-1.3	.;N;N
REVEL	Benign	0.081
Sift	Benign	0.038	.;D;D
Sift4G	Uncertain	0.055	.;T;T
Polyphen		0.0	.;B;.
Vest4		0.062, 0.067
MutPred		0.26		Loss of solvent accessibility (P = 0.0169);Loss of solvent accessibility (P = 0.0169);Loss of solvent accessibility (P = 0.0169);
MVP		0.11
MPC		0.74
ClinPred		0.51	D
GERP RS		2.9
Varity_R		0.21
gMVP		0.39

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

Publications

LitVar

Other links and lift over

dbSNP: rs1667204535; hg19: chr1-151584691;