rs114260147

Positions:

• chr5-149980375-C-G

Variant summary

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

The NM_000112.4(SLC26A2):​c.782C>G​(p.Ser261Cys) variant causes a missense change. The variant allele was found at a frequency of 0.000662 in 1,614,118 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.00076 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00065 (0 hom.)
• Consequence: SLC26A2 NM_000112.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:14
• Conservation: PhyloP100: 6.17

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SLC26A2	NM_000112.4	c.782C>G	p.Ser261Cys	missense_variant	3/3	ENST00000286298.5	NP_000103.2
SLC26A2	XM_017009191.3	c.782C>G	p.Ser261Cys	missense_variant	3/4		XP_016864680.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SLC26A2	ENST00000286298.5	c.782C>G	p.Ser261Cys	missense_variant	3/3	1	NM_000112.4	ENSP00000286298.4
SLC26A2	ENST00000503336.1	c.372+2024C>G		intron_variant		3		ENSP00000426053.1

Frequencies

GnomAD3 genomes AF: 0.000756 AC: 115 AN: 152188 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00118

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00141

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.00101

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.000748 AC: 188 AN: 251362 Hom.: 0 AF XY: 0.000788 AC XY: 107 AN XY: 135848

Gnomad AFR exome AF: 0.000123

Gnomad AMR exome AF: 0.00101

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00120

Gnomad NFE exome AF: 0.000968

Gnomad OTH exome AF: 0.00212

GnomAD4 exome AF: 0.000653 AC: 954 AN: 1461812 Hom.: 0 Cov.: 33 AF XY: 0.000657 AC XY: 478 AN XY: 727214

Gnomad4 AFR exome AF: 0.000179

Gnomad4 AMR exome AF: 0.00101

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000348

Gnomad4 FIN exome AF: 0.00107

Gnomad4 NFE exome AF: 0.000710

Gnomad4 OTH exome AF: 0.000662

GnomAD4 genome AF: 0.000755 AC: 115 AN: 152306 Hom.: 0 Cov.: 32 AF XY: 0.000738 AC XY: 55 AN XY: 74478

Gnomad4 AFR AF: 0.000241

Gnomad4 AMR AF: 0.00118

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00141

Gnomad4 NFE AF: 0.00101

Gnomad4 OTH AF: 0.000473

Alfa AF: 0.000820 Hom.: 0

Bravo AF: 0.000797

TwinsUK AF: 0.000539 AC: 2

ALSPAC AF: 0.000259 AC: 1

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.000814 AC: 7

ExAC AF: 0.000815 AC: 99

Asia WGS AF: 0.000289 AC: 1 AN: 3478

EpiCase AF: 0.00115

EpiControl AF: 0.00107

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:14

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Achondrogenesis, type IB Uncertain:3

Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -
Uncertain significance, no assertion criteria provided	clinical testing	Natera, Inc.	Jan 17, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Atelosteogenesis type II Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Multiple epiphyseal dysplasia type 4 Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Mar 01, 2021	Observed in two half-siblings with Crohn's disease; these individuals also harbored a missense variant in the CTLA4 gene that was stated by the authors to be associated with the reported disease (Zeissig et al., 2014); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25367873) -
Uncertain significance, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Diastrophic dysplasia Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 12, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 22, 2021	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Aug 05, 2022

Variant summary: SLC26A2 c.782C>G (p.Ser261Cys) results in a non-conservative amino acid change located in the SLC26A/SulP transporter domain (IPR011547) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00075 in 251362 control chromosomes (gnomAD). This frequency is not significantly higher than expected for a pathogenic variant in SLC26A2 causing Sulfate Transporter-Related Osteochondrodysplasia (0.00075 vs 0.003), allowing no conclusion about variant significance. To our knowledge, no occurrence of c.782C>G in individuals affected with Sulfate Transporter-Related Osteochondrodysplasia and no experimental evidence demonstrating its impact on protein function have been reported. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 and all classified the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 25, 2022

This sequence change replaces serine, which is neutral and polar, with cysteine, which is neutral and slightly polar, at codon 261 of the SLC26A2 protein (p.Ser261Cys). This variant is present in population databases (rs114260147, gnomAD 0.1%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with SLC26A2-related conditions. ClinVar contains an entry for this variant (Variation ID: 426387). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt SLC26A2 protein function. 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. -

Sulfate transporter-related osteochondrodysplasia Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.31
BayesDel_addAF	Uncertain	0.14	D
BayesDel_noAF	Pathogenic	0.37
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.86	D
Eigen	Pathogenic	0.76
Eigen_PC	Pathogenic	0.73
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.89	D
M_CAP	Uncertain	0.25	D
MetaRNN	Uncertain	0.48	T
MetaSVM	Pathogenic	0.97	D
MutationAssessor	Uncertain	2.4	M
PrimateAI	Uncertain	0.68	T
PROVEAN	Uncertain	-3.8	D
REVEL	Pathogenic	0.91
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0020	D
Polyphen		1.0	D
Vest4		0.75
MVP		1.0
MPC		0.32
ClinPred		0.092	T
GERP RS		5.1
Varity_R		0.84
gMVP		0.93

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs114260147; hg19: chr5-149359938;