rs763198695

Variant names:

• chr5-149978134-CTG-C
• rs763198695
• NM_000112.4:c.485_486delTG

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000112.4(SLC26A2):​c.485_486delTG​(p.Val162GlyfsTer12) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000685 in 1,606,932 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0000069 (0 hom.)
• Consequence: SLC26A2 NM_000112.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8
• Conservation: PhyloP100: 10.0

Genes affected

SLC26A2 (HGNC:10994): (solute carrier family 26 member 2) The diastrophic dysplasia sulfate transporter is a transmembrane glycoprotein implicated in the pathogenesis of several human chondrodysplasias. It apparently is critical in cartilage for sulfation of proteoglycans and matrix organization. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 5-149978134-CTG-C is Pathogenic according to our data. Variant chr5-149978134-CTG-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 371777.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SLC26A2	NM_000112.4	c.485_486delTG	p.Val162GlyfsTer12	frameshift_variant	Exon 2 of 3	ENST00000286298.5	NP_000103.2
SLC26A2	XM_017009191.3	c.485_486delTG	p.Val162GlyfsTer12	frameshift_variant	Exon 2 of 4		XP_016864680.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SLC26A2	ENST00000286298.5	c.485_486delTG	p.Val162GlyfsTer12	frameshift_variant	Exon 2 of 3	1	NM_000112.4	ENSP00000286298.4
SLC26A2	ENST00000503336.1	c.158_159delTG	p.Val53GlyfsTer12	frameshift_variant	Exon 1 of 2	3		ENSP00000426053.1
SLC26A2	ENST00000690410.1	n.717_718delTG		non_coding_transcript_exon_variant	Exon 2 of 2

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152148 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.00000403 AC: 1 AN: 247972 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 134048

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.0000545

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000687 AC: 10 AN: 1454784 Hom.: 0 AF XY: 0.0000111 AC XY: 8 AN XY: 722796

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000152

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000271

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152148 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74318

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Achondrogenesis, type IB Pathogenic:2

Mar 26, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 04, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Atelosteogenesis type II Pathogenic:1

Oct 04, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Multiple epiphyseal dysplasia type 4 Pathogenic:1

Oct 04, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Diastrophic dysplasia;C0265274:Achondrogenesis, type IB;C1847593:Multiple epiphyseal dysplasia type 4;C1850554:Atelosteogenesis type II Pathogenic:1

Nov 17, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Val162Glyfs*12) in the SLC26A2 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SLC26A2 are known to be pathogenic (PMID: 7923357, 10482955, 11241838). This variant is present in population databases (rs763198695, gnomAD 0.005%). This premature translational stop signal has been observed in individuals with SLC26A2-related skeletal dysplasia (PMID: 20592910; Invitae). ClinVar contains an entry for this variant (Variation ID: 371777). For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

Aug 24, 2023

GeneDx

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 33728303, 30423444, 21965141, 26402641, 20592910) -

Sulfate transporter-related osteochondrodysplasia Pathogenic:1

Sep 09, 2020

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: SLC26A2 c.485_486delTG (p.Val162GlyfsX12) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant allele was found at a frequency of 4e-06 in 247972 control chromosomes. c.485_486delTG has been reported in the literature in at-least one individual affected with Sulfate Transporter-Related Osteochondrodysplasia and has been subsequently cited by others (example, Cho_2010, Kim_2011, Bae_2016, Kausar_2019) consistent with the mutational spectrum of SLC26A2 related skeletal dysplasias. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Diastrophic dysplasia Pathogenic:1

Oct 04, 2016

Counsyl

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

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: rs763198695; hg19: chr5-149357697;