10-71362166-A-G

Position:

• chr10-71362166-A-G

Variant summary

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

The NM_018344.6(SLC29A3):​c.986A>G​(p.Asn329Ser) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. N329N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 31)
• Consequence: SLC29A3 NM_018344.6 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.60

Genes affected

SLC29A3 (HGNC:23096): (solute carrier family 29 member 3) This gene encodes a nucleoside transporter. The encoded protein plays a role in cellular uptake of nucleosides, nucleobases, and their related analogs. Mutations in this gene have been associated with H syndrome, which is characterized by cutaneous hyperpigmentation and hypertrichosis, hepatosplenomegaly, heart anomalies, and hypogonadism. A related disorder, PHID (pigmented hypertrichosis with insulin-dependent diabetes mellitus), has also been associated with mutations at this locus. Alternatively spliced transcript variants have been described.[provided by RefSeq, Mar 2010]

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=0.13756356).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SLC29A3	NM_018344.6	c.986A>G	p.Asn329Ser	missense_variant	6/6	ENST00000373189.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SLC29A3	ENST00000373189.6	c.986A>G	p.Asn329Ser	missense_variant	6/6	1	NM_018344.6	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 77

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

H syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 15, 2017

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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with SLC29A3-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces asparagine with serine at codon 329 of the SLC29A3 protein (p.Asn329Ser). The asparagine residue is moderately conserved and there is a small physicochemical difference between asparagine and serine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	16
DANN	Benign	0.95
DEOGEN2	Benign	0.0092	T;T;.
Eigen	Benign	-0.18
Eigen_PC	Benign	0.033
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Benign	0.77	.;T;T
M_CAP	Benign	0.014	T
MetaRNN	Benign	0.14	T;T;T
MetaSVM	Benign	-0.88	T
MutationAssessor	Benign	1.0	L;L;.
MutationTaster	Benign	0.94	D
PrimateAI	Benign	0.41	T
PROVEAN	Benign	-1.0	.;N;.
REVEL	Benign	0.069
Sift	Benign	0.55	.;T;.
Polyphen		0.014	B;B;.
Vest4		0.064
MutPred		0.35		Gain of disorder (P = 0.0573);Gain of disorder (P = 0.0573);.;
MVP		0.75
MPC		0.083
ClinPred		0.38	T
GERP RS		5.6
Varity_R		0.078
gMVP		0.38

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: rs1554818046; hg19: chr10-73121923;