rs192332761

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_003002.4(SDHD):c.53C>T(p.Ala18Val) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000145 in 1,602,308 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00011 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

SDHD
NM_003002.4 missense, splice_region

Scores

Splicing: ADA: 0.003291

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:11B:4

Conservation

PhyloP100: 1.25

Variant links:

Genes affected

SDHD (HGNC:10683): (succinate dehydrogenase complex subunit D) This gene encodes a member of complex II of the respiratory chain, which is responsible for the oxidation of succinate. The encoded protein is one of two integral membrane proteins anchoring the complex to the matrix side of the mitochondrial inner membrane. Mutations in this gene are associated with the formation of tumors, including hereditary paraganglioma. Transmission of disease occurs almost exclusively through the paternal allele, suggesting that this locus may be maternally imprinted. There are pseudogenes for this gene on chromosomes 1, 2, 3, 7, and 18. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Feb 2013]

SDHD links:

ENSG00000255292 (HGNC:):

ENSG00000255292 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.15887043).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SDHD	NM_003002.4 link	c.53C>T	p.Ala18Val	missense_variant, splice_region_variant	Exon 2 of 4	ENST00000375549.8	NP_002993.1	O14521-1A0A0S2Z4J3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SDHD	ENST00000375549.8 link	c.53C>T	p.Ala18Val	missense_variant, splice_region_variant	Exon 2 of 4	1	NM_003002.4	ENSP00000364699.3		O14521-1
ENSG00000255292	ENST00000532699.1 link	n.53C>T		splice_region_variant, non_coding_transcript_exon_variant	Exon 2 of 6	3		ENSP00000456434.1		H3BRW5

Frequencies

GnomAD3 genomes

AF:

0.000105

AC:

AN:

152242

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000676

AC:

AN:

251432

Hom.:

AF XY:

0.0000589

AC XY:

AN XY:

135890

show subpopulations

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:

0.000141

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000149

AC:

216

AN:

1449948

Hom.:

Cov.:

AF XY:

0.000155

AC XY:

112

AN XY:

722188

show subpopulations

Gnomad4 AFR exome

AF:

0.0000301

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:

0.0000187

Gnomad4 NFE exome

AF:

0.000191

Gnomad4 OTH exome

AF:

0.0000668

GnomAD4 genome

AF:

0.000105

AC:

AN:

152360

Hom.:

Cov.:

AF XY:

0.0000268

AC XY:

AN XY:

74508

show subpopulations

Gnomad4 AFR

AF:

0.000120

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000157

Hom.:

Bravo

AF:

0.000117

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000778

AC:

ExAC

AF:

0.0000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:11Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:3

Genome Diagnostics Laboratory, Amsterdam University Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Feb 13, 2020

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jul 26, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Observed in individuals with head/neck paraganglioma or pituitary adenoma (Xekouki et al., 2015; Sen et al., 2020); This variant is associated with the following publications: (PMID: 25695889, 28873162, 32035780, 30273935, 36149413, 35938916) -

Hereditary pheochromocytoma-paraganglioma

Uncertain:2Benign:1

Apr 28, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases allowed determination this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Sep 29, 2021

St. Jude Molecular Pathology, St. Jude Children's Research Hospital

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SDHD c.53C>T (p.Ala18Val) missense change has a maximum subpopulation frequency of 0.013% in gnomAD v2.1.1 (https://gnomad.broadinstitute.org/variant/11-111958581-C-T?dataset=gnomad_r2_1). In silico tools are not in agreement about the effect of this variant on protein function, but to our knowledge these predictions have not been confirmed by functional assays. In addition, algorithms that predict the impact of sequence changes on splicing indicate that this variant does not affect splicing. This variant has been reported in an individual with an ACTH-secreting pituitary adenoma, mild neurocognitive defects, and anxiety (PMID: 25695889, 30273935). In summary, this variant meets criteria to be classified as of uncertain significance based on the ACMG/AMP criteria: no evidence criteria applied. -

Sep 23, 2024

All of Us Research Program, National Institutes of Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This missense variant replaces alanine with valine at codon 18 of the SDHD protein. Computational prediction suggests that this variant may not impact protein structure and function (internally defined REVEL score threshold <= 0.5, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in individuals affected with head and neck paraganglioma and pituitary adenoma (PMID: 25695889, 32035780). This variant has been identified in 21/282830 chromosomes in the general population by the Genome Aggregation Database (gnomAD). The available evidence is insufficient to determine the role of this variant in disease conclusively. Therefore, this variant is classified as a Variant of Uncertain Significance. -

Paragangliomas 1

Uncertain:2

Sep 01, 2021

MGZ Medical Genetics Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 11, 2023

Color Diagnostics, LLC DBA Color Health

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Hereditary cancer-predisposing syndrome

Uncertain:2

Jan 04, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.A18V variant (also known as c.53C>T) is located in coding exon 2 of the SDHD gene. The alanine at codon 18 is replaced by valine, an amino acid with similar properties. This change occurs in the first base pair of coding exon 2. This alteration was reported in one individual with a sporadic pituitary adenoma (Xekoui et al. J. Clin. Endocrinol. Metab. 2015 May;100(5): E710-9). It has also been reported in a patient diagnosed with a carotid body tumor at age 48 (Sen I et al. J Vasc Surg, 2020 May;71:1602-1612.e2). However, this variant has been detected in multiple individuals with no reported features of SDHD-associated disease (Ambry internal data). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Nov 12, 2021

Sema4, Sema4

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Pheochromocytoma;C1847319:Carney-Stratakis syndrome;C1868633:Paragangliomas with sensorineural hearing loss;CN166604:Cowden syndrome 3

Uncertain:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces alanine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 18 of the SDHD protein (p.Ala18Val). This variant is present in population databases (rs192332761, gnomAD 0.01%). This missense change has been observed in individual(s) with a pituitary adenoma (PMID: 25695889). ClinVar contains an entry for this variant (Variation ID: 302481). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt SDHD protein function with a negative predictive value of 95%. 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. -

Mitochondrial complex 2 deficiency, nuclear type 3

Uncertain:1

Mar 24, 2024

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

SDHD-related disorder

Uncertain:1

May 08, 2024

PreventionGenetics, part of Exact Sciences

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The SDHD c.53C>T variant is predicted to result in the amino acid substitution p.Ala18Val. This variant was observed in an individual with an ACTH-producing pituitary adenoma; although no further evidence was provided to determine its pathogenicity (Xekouki et al. 2015. PubMed ID: 25695889). This variant is reported in 0.013% of alleles in individuals of European (Non-Finnish) descent in gnomAD. In ClinVar, it is reported as likely benign, and uncertain significance (https://www.ncbi.nlm.nih.gov/clinvar/variation/302481/). At this time, the clinical significance of this variant is uncertain due to the absence of conclusive functional and genetic evidence. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.11

BayesDel_addAF

Uncertain

0.012

BayesDel_noAF

Uncertain

0.020

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.31

T;.;.;.;.;.

Eigen

Benign

-0.57

Eigen_PC

Benign

-0.44

FATHMM_MKL

Uncertain

0.81

LIST_S2

Benign

0.78

T;T;T;T;T;.

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.16

T;T;T;T;T;T

MetaSVM

Benign

-0.34

MutationAssessor

Benign

1.3

L;L;.;L;.;L

PrimateAI

Benign

0.44

PROVEAN

Benign

-0.98

N;.;N;D;N;N

REVEL

Uncertain

0.48

Sift

Benign

0.081

T;.;D;D;T;T

Sift4G

Benign

0.12

T;T;T;T;T;T

Polyphen

0.0040

B;.;.;.;.;.

Vest4

0.32

MVP

0.97

MPC

0.19

ClinPred

0.096

GERP RS

2.7

Varity_R

0.044

gMVP

0.54

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.0033

dbscSNV1_RF

Benign

0.16

SpliceAI score (max)

0.14

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over