rs786204675

Positions:

• chr5-149978100-AT-A

Variant summary

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

The ENST00000286298.5(SLC26A2):​c.451del​(p.Tyr151IlefsTer21) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000414 in 1,449,232 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: not found (cov: 32)
  • Exomes 𝑓: 0.0000041 (0 hom.)
• Consequence: SLC26A2 ENST00000286298.5 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: 8.01

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 5-149978100-AT-A is Pathogenic according to our data. Variant chr5-149978100-AT-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 189077.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A2	NM_000112.4	c.451del	p.Tyr151IlefsTer21	frameshift_variant	2/3	ENST00000286298.5	NP_000103.2
SLC26A2	XM_017009191.3	c.451del	p.Tyr151IlefsTer21	frameshift_variant	2/4		XP_016864680.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC26A2	ENST00000286298.5	c.451del	p.Tyr151IlefsTer21	frameshift_variant	2/3	1	NM_000112.4	ENSP00000286298	P1
SLC26A2	ENST00000503336.1	c.124del	p.Tyr42IlefsTer21	frameshift_variant	1/2	3		ENSP00000426053
SLC26A2	ENST00000690410.1	n.683del		non_coding_transcript_exon_variant	2/2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000165 AC: 4 AN: 243092 Hom.: 0 AF XY: 0.0000304 AC XY: 4 AN XY: 131376

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

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: 0.0000361

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000414 AC: 6 AN: 1449232 Hom.: 0 Cov.: 33 AF XY: 0.00000556 AC XY: 4 AN XY: 719480

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: 0.00000452

Gnomad4 OTH exome AF: 0.0000167

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Diastrophic dysplasia;C0265274:Achondrogenesis, type IB;C1847593:Multiple epiphyseal dysplasia type 4;C1850554:Atelosteogenesis type II Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Dec 02, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Sep 12, 2023	For these reasons, this variant has been classified as Pathogenic. This sequence change creates a premature translational stop signal (p.Tyr151Ilefs*21) 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 (rs775460563, gnomAD 0.004%). This premature translational stop signal has been observed in individual(s) with achondrogenesis (PMID: 8528239). This variant is also known as deltaT476. ClinVar contains an entry for this variant (Variation ID: 189077). -

Multiple epiphyseal dysplasia type 4 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

literature only

Counsyl

Dec 02, 2014

- -

Achondrogenesis, type IB Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Feb 06, 2024

- -

Sulfate transporter-related osteochondrodysplasia Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

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

Oct 22, 2018

Variant summary: SLC26A2 c.451delT (p.Tyr151IlefsX21) 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 (e.g., p.Arg178X and p.Lys575fsX10). The variant allele was found at a frequency of 1.7e-05 in 238100 control chromosomes (gnomAD). c.451delT has been reported in the literature in one individual affected with Sulfate Transporter-Related Osteochondrodysplasia. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as likely pathogenic. -

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: rs786204675; hg19: chr5-149357663;