chr16-50673942-C-T

Position:

• chr16-50673942-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_182854.4(SNX20):​c.415G>A​(p.Glu139Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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 (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SNX20 NM_182854.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.114

Genes affected

SNX20 (HGNC:30390): (sorting nexin 20) SNX20 interacts with the cytoplasmic domain of PSGL1 (SELPLG; MIM 600738) and cycles PSGL1 into endosomes.[supplied by OMIM, Feb 2010]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.040695906).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNX20	NM_182854.4	c.415G>A	p.Glu139Lys	missense_variant	4/4	ENST00000330943.9
SNX20	NM_001144972.2	c.282+1828G>A		intron_variant
SNX20	NM_153337.3	c.282+1828G>A		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SNX20	ENST00000330943.9	c.415G>A	p.Glu139Lys	missense_variant	4/4	1	NM_182854.4	P1
SNX20	ENST00000423026.6	c.282+1828G>A		intron_variant		1
SNX20	ENST00000568993.5	c.282+1828G>A		intron_variant, NMD_transcript_variant		1
SNX20	ENST00000300590.7	c.282+1828G>A		intron_variant		2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 16, 2023

The c.415G>A (p.E139K) alteration is located in exon 4 (coding exon 3) of the SNX20 gene. This alteration results from a G to A substitution at nucleotide position 415, causing the glutamic acid (E) at amino acid position 139 to be replaced by a lysine (K). 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	0.11
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.64
CADD	Benign	17
DANN	Uncertain	0.98
DEOGEN2	Benign	0.0046	T
Eigen	Benign	-0.94
Eigen_PC	Benign	-0.88
FATHMM_MKL	Benign	0.045	N
LIST_S2	Uncertain	0.89	D
M_CAP	Benign	0.0099	T
MetaRNN	Benign	0.041	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.075	N
MutationTaster	Benign	1.0	N;N;N
PrimateAI	Benign	0.26	T
PROVEAN	Benign	-0.10	N
REVEL	Benign	0.020
Sift	Benign	0.68	T
Sift4G	Benign	0.10	T
Polyphen		0.0050	B
Vest4		0.044
MutPred		0.40		Gain of methylation at E139 (P = 0.0059);
MVP		0.63
MPC		0.61
ClinPred		0.066	T
GERP RS		1.9
Varity_R		0.055
gMVP		0.18

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr16-50707853;