10-103089678-T-TTCC

Variant names:

• chr10-103089678-T-TTCC
• rs537259520
• NM_001351169.2:c.1677_1679dupGGA

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP3

The NM_001351169.2(NT5C2):​c.1677_1679dupGGA​(p.Glu560dup) variant causes a disruptive inframe insertion change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000526 in 1,560,012 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000053 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000053 (0 hom.)
• Consequence: NT5C2 NM_001351169.2 disruptive_inframe_insertion
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.29

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP3: Nonframeshift variant in repetitive region in NM_001351169.2

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NT5C2	NM_001351169.2	c.1677_1679dupGGA	p.Glu560dup	disruptive_inframe_insertion	Exon 19 of 19	ENST00000404739.8	NP_001338098.1
CNNM2	NM_017649.5	c.*12513_*12515dupCTC		3_prime_UTR_variant	Exon 8 of 8	ENST00000369878.9	NP_060119.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NT5C2	ENST00000404739.8	c.1677_1679dupGGA	p.Glu560dup	disruptive_inframe_insertion	Exon 19 of 19	1	NM_001351169.2	ENSP00000383960.3
CNNM2	ENST00000369878.9	c.*12513_*12515dupCTC		3_prime_UTR_variant	Exon 8 of 8	1	NM_017649.5	ENSP00000358894.3

Frequencies

GnomAD3 genomes AF: 0.0000526 AC: 8 AN: 152034 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000735

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000317 AC: 7 AN: 220626 Hom.: 0 AF XY: 0.0000338 AC XY: 4 AN XY: 118498

Gnomad AFR exome AF: 0.0000658

Gnomad AMR exome AF: 0.0000340

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: 0.0000493

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000526 AC: 74 AN: 1407864 Hom.: 0 Cov.: 30 AF XY: 0.0000486 AC XY: 34 AN XY: 699656

Gnomad4 AFR exome AF: 0.0000934

Gnomad4 AMR exome AF: 0.0000236

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000129

Gnomad4 SAS exome AF: 0.0000247

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000559

Gnomad4 OTH exome AF: 0.0000516

GnomAD4 genome AF: 0.0000526 AC: 8 AN: 152148 Hom.: 0 Cov.: 32 AF XY: 0.0000807 AC XY: 6 AN XY: 74384

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000654

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000208

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000735

Gnomad4 OTH AF: 0.00

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary spastic paraplegia 45 Uncertain:1

Mar 16, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. This variant has not been reported in the literature in individuals affected with NT5C2-related conditions. This variant is present in population databases (rs751199209, gnomAD 0.007%). This sequence change disrupts the translational stop signal of the NT5C2 mRNA. It is expected to extend the length of the NT5C2 protein by 1 additional amino acid residues. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs537259520; hg19: chr10-104849435;