7-2257418-C-T

Variant names:

• chr7-2257418-C-T
• rs746184528
• NM_013321.4:c.1081G>A

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_013321.4(SNX8):​c.1081G>A​(p.Ala361Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,458,332 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 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. A361S) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: SNX8 NM_013321.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.95

Genes affected

SNX8 (HGNC:14972): (sorting nexin 8) Enables identical protein binding activity and phosphatidylinositol binding activity. Involved in early endosome to Golgi transport and intracellular protein transport. Located in early endosome membrane. Colocalizes with retromer complex. [provided by Alliance of Genome Resources, Apr 2022]

MIR6836 (HGNC:50067): (microRNA 6836) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12072092).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNX8	NM_013321.4	c.1081G>A	p.Ala361Thr	missense_variant	Exon 9 of 11	ENST00000222990.8	NP_037453.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNX8	ENST00000222990.8	c.1081G>A	p.Ala361Thr	missense_variant	Exon 9 of 11	1	NM_013321.4	ENSP00000222990.3
SNX8	ENST00000480807.1	n.201G>A		non_coding_transcript_exon_variant	Exon 1 of 3	2
SNX8	ENST00000479689.1	n.*248G>A		downstream_gene_variant		2
MIR6836	ENST00000617724.1	n.*97G>A		downstream_gene_variant		6

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD3 exomes AF: 0.00000817 AC: 2 AN: 244670 Hom.: 0 AF XY: 0.00000751 AC XY: 1 AN XY: 133194

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000292

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: 0.00000905

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1458332 Hom.: 0 Cov.: 35 AF XY: 0.00000276 AC XY: 2 AN XY: 725572

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 34

ExAC AF: 0.00000825 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000595

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Sep 26, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1081G>A (p.A361T) alteration is located in exon 9 (coding exon 9) of the SNX8 gene. This alteration results from a G to A substitution at nucleotide position 1081, causing the alanine (A) at amino acid position 361 to be replaced by a threonine (T). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.074
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.69
CADD	Benign	16
DANN	Benign	0.86
DEOGEN2	Benign	0.0084	T
Eigen	Benign	-0.36
Eigen_PC	Benign	-0.30
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.0065	T
MetaRNN	Benign	0.12	T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.20	N
PrimateAI	Benign	0.32	T
PROVEAN	Benign	-0.43	N
REVEL	Benign	0.055
Sift	Benign	0.35	T
Sift4G	Benign	0.36	T
Polyphen		0.28	B
Vest4		0.16
MutPred		0.20		Gain of phosphorylation at A361 (P = 0.031);
MVP		0.28
MPC		0.25
ClinPred		0.16	T
GERP RS		4.1
Varity_R		0.025
gMVP		0.12

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: rs746184528; hg19: chr7-2297053;