10-103089740-C-T

Variant summary

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

The NM_001351169.2(NT5C2):c.1618G>A(p.Ala540Thr) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,410 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 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. A540V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: NT5C2 NM_001351169.2 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.02

Genes affected

NT5C2 (HGNC:8022): (5'-nucleotidase, cytosolic II) This gene encodes a hydrolase that serves as an important role in cellular purine metabolism by acting primarily on inosine 5'-monophosphate and other purine nucleotides. [provided by RefSeq, Oct 2011]

CNNM2 (HGNC:103): (cyclin and CBS domain divalent metal cation transport mediator 2) This gene encodes a member of the ancient conserved domain containing protein family. Members of this protein family contain a cyclin box motif and have structural similarity to the cyclins. The encoded protein may play an important role in magnesium homeostasis by mediating the epithelial transport and renal reabsorption of Mg2+. Mutations in this gene are associated with renal hypomagnesemia. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

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=0.037493765).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NT5C2	NM_001351169.2	c.1618G>A	p.Ala540Thr	missense_variant	19/19	ENST00000404739.8
CNNM2	NM_017649.5	c.*12560C>T		3_prime_UTR_variant	8/8	ENST00000369878.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NT5C2	ENST00000404739.8	c.1618G>A	p.Ala540Thr	missense_variant	19/19	1	NM_001351169.2	P1
CNNM2	ENST00000369878.9	c.*12560C>T		3_prime_UTR_variant	8/8	1	NM_017649.5	P4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461410 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726990

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 45 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Dec 11, 2023

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 540 of the NT5C2 protein (p.Ala540Thr). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with NT5C2-related conditions. ClinVar contains an entry for this variant (Variation ID: 1957036). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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	0.074
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.68
Cadd	Benign	21
Dann	Benign	0.22
DEOGEN2	Benign	0.073	T;T
Eigen	Benign	-0.31
Eigen_PC	Benign	-0.0070
FATHMM_MKL	Uncertain	0.89	D
M_CAP	Benign	0.0030	T
MetaRNN	Benign	0.037	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	-0.49	N;N
MutationTaster	Benign	0.95	D;D;D
PrimateAI	Uncertain	0.67	T
PROVEAN	Benign	1.7	N;N
REVEL	Benign	0.10
Sift	Benign	1.0	T;T
Sift4G	Benign	1.0	T;T
Polyphen		0.0	B;B
Vest4		0.043
MutPred		0.098		Gain of phosphorylation at A540 (P = 0.0884);Gain of phosphorylation at A540 (P = 0.0884);
MVP		0.24
MPC		0.67
ClinPred		0.71	D
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.12
gMVP		0.17

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		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: rs1247558433; hg19: chr10-104849497;