rs35962811

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 2P and 16B. PM1BP4_StrongBP6_Very_StrongBS1

The NM_003000.3(SDHB):c.170A>G(p.His57Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000411 in 1,614,114 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H57Y) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0022 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00022 ( 1 hom. )

Consequence

SDHB
NM_003000.3 missense

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:13O:1

Conservation

PhyloP100: 0.109

Variant links:

Genes affected

SDHB (HGNC:10681): (succinate dehydrogenase complex iron sulfur subunit B) This tumor suppressor gene encodes the iron-sulfur protein subunit of the succinate dehydrogenase (SDH) enzyme complex which plays a critical role in mitochondria. The SDH enzyme complex is composed of four nuclear-encoded subunits. This enzyme complex converts succinate to fumarate which releases electrons as part of the citric acid cycle, and the enzyme complex additionally provides an attachment site for released electrons to be transferred to the oxidative phosphorylation pathway. The SDH enzyme complex plays a role in oxygen-related gene regulation through its conversion of succinate, which is an oxygen sensor that stabilizes the hypoxia-inducible factor 1 (HIF1) transcription factor. Sporadic and familial mutations in this gene result in paragangliomas, pheochromocytoma, and gastrointestinal stromal tumors, supporting a link between mitochondrial dysfunction and tumorigenesis. Mutations in this gene are also implicated in nuclear type 4 mitochondrial complex II deficiency. [provided by RefSeq, Jun 2022]

SDHB links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -14 ACMG points.

PM1

In a chain Succinate dehydrogenase [ubiquinone] iron-sulfur subunit, mitochondrial (size 251) in uniprot entity SDHB_HUMAN there are 191 pathogenic changes around while only 17 benign (92%) in NM_003000.3

BP4

Computational evidence support a benign effect (MetaRNN=0.0065252483).

BP6

Variant 1-17044791-T-C is Benign according to our data. Variant chr1-17044791-T-C is described in ClinVar as [Likely_benign]. Clinvar id is 135192.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-17044791-T-C is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00221 (336/152312) while in subpopulation AFR AF= 0.00714 (297/41576). AF 95% confidence interval is 0.00648. There are 0 homozygotes in gnomad4. There are 170 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHB	NM_003000.3 linkuse as main transcript	c.170A>G	p.His57Arg	missense_variant	2/8	ENST00000375499.8
SDHB	NM_001407361.1 linkuse as main transcript	c.170A>G	p.His57Arg	missense_variant	2/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHB	ENST00000375499.8 linkuse as main transcript	c.170A>G	p.His57Arg	missense_variant	2/8	1	NM_003000.3	P1

Frequencies

GnomAD3 genomes

AF:

0.00221

AC:

336

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00716

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00203

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00287

GnomAD3 exomes

AF:

0.000680

AC:

171

AN:

251378

Hom.:

AF XY:

0.000508

AC XY:

AN XY:

135866

show subpopulations

Gnomad AFR exome

AF:

0.00843

Gnomad AMR exome

AF:

0.000809

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:

0.00000880

Gnomad OTH exome

AF:

0.000815

GnomAD4 exome

AF:

0.000224

AC:

327

AN:

1461802

Hom.:

Cov.:

AF XY:

0.000197

AC XY:

143

AN XY:

727212

show subpopulations

Gnomad4 AFR exome

AF:

0.00744

Gnomad4 AMR exome

AF:

0.000894

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:

0.00000540

Gnomad4 OTH exome

AF:

0.000513

GnomAD4 genome

AF:

0.00221

AC:

336

AN:

152312

Hom.:

Cov.:

AF XY:

0.00228

AC XY:

170

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.00714

Gnomad4 AMR

AF:

0.00203

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00284

Alfa

AF:

0.000337

Hom.:

Bravo

AF:

0.00242

ESP6500AA

AF:

0.00840

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000725

AC:

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:13Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:3Other:1

not provided, no classification provided	reference population	ITMI	Sep 19, 2013	- -
Benign, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Dec 04, 2017	Variant summary: The SDHB c.170A>G (p.His57Arg) variant involves the alteration of a non-conserved nucleotide located in the Succinate dehydogenase/fumarate reductase N-terminal (IPR025192) and the 2Fe-2S ferredoxin-type iron-sulfur binding domains (IPR001041) (InterPro). 3/4 in silico tools predict a benign outcome for this variant (SNPsandGO not captured due to low reliability index). This variant was found in 222/278486 control chromosomes (gnomAD and Bodian_2014) at a frequency of 0.0007972, which is approximately 911 times the estimated maximal expected allele frequency of a pathogenic SDHB variant (0.0000009), suggesting this variant is likely a benign polymorphism. In addition, multiple clinical diagnostic laboratories/reputable databases classified this variant as benign. The variant of interest has not, to our knowledge, been reported in individuals with Hereditary paraganglioma-pheochromocytoma syndrome via publications and/or reputable databases/clinical diagnostic laboratories; nor evaluated for functional impact by in vivo/vitro studies. Taken together, this variant is classified as benign. -
Likely benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Mar 28, 2016	Variant identified in a genome or exome case(s) and assessed due to predicted null impact of the variant or pathogenic assertions in the literature or databases. Disclaimer: This variant has not undergone full assessment. The following are preliminary notes: 2 papers describe as non disease causing; ExAC: 0.8% (79/10404) African chromosomes; ClinVar: 3 labs classify as LB -
Likely benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -

not provided

Benign:2

Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Mar 22, 2018	The SDHB c.170A>G; p.His57Arg variant is reported in the medical literature with an individual with Cowden or Cowden-like syndrome (Ni 2012), but is also reported at a greater frequency in the general population than expected for the disorder (Olfson 2015). The variant is described as benign or likely benign by several sources in the ClinVar database (Variation ID: 135192). This variant is found in the African population with an overall allele frequency of 0.8% (191/24040 alleles) in the Genome Aggregation Database. The amino acid at this position is weakly conserved across species and computational algorithms (PolyPhen-2, SIFT) predict this variant is tolerated. Considering available information, this variant is classified as likely benign. References: Ni Y et al. Germline SDHx variants modify breast and thyroid cancer risks in Cowden and Cowden-like syndrome via FAD/NAD-dependant destabilization of p53. Hum Mol Genet. 2012 Jan 15;21(2):300-10. Olfson E et al. Identification of Medically Actionable Secondary Findings in the 1000 Genomes. PLoS One. 2015 Sep 2;10(9):e0135193. -
Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	May 03, 2017	- -

Paragangliomas 4

Benign:2

Benign, criteria provided, single submitter	clinical testing	KCCC/NGS Laboratory, Kuwait Cancer Control Center	Jul 07, 2023	- -
Benign, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	Nov 07, 2022	- -

Hereditary cancer-predisposing syndrome

Benign:2

Benign, criteria provided, single submitter	curation	Sema4, Sema4	Apr 05, 2021	- -
Benign, criteria provided, single submitter	clinical testing	Ambry Genetics	Nov 17, 2015	This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Pheochromocytoma;C0238198:Gastrointestinal stromal tumor;C1861848:Paragangliomas 4

Benign:1

Benign, criteria provided, single submitter

clinical testing

Invitae

Jan 31, 2024

- -

Cowden syndrome

Benign:1

Likely benign, no assertion criteria provided

research

CSER _CC_NCGL, University of Washington

Jun 01, 2014

- -

Carney-Stratakis syndrome

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Oct 15, 2018

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). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

Hereditary pheochromocytoma-paraganglioma

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Oct 15, 2018

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.051

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Uncertain

0.010

Cadd

Benign

0.11

Dann

Benign

0.25

DEOGEN2

Uncertain

0.49

T;.

Eigen

Benign

-1.5

Eigen_PC

Benign

-1.5

FATHMM_MKL

Benign

0.027

LIST_S2

Benign

0.82

T;T

M_CAP

Benign

0.027

MetaRNN

Benign

0.0065

T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

-0.43

N;.

MutationTaster

Benign

1.0

PrimateAI

Benign

0.29

PROVEAN

Benign

0.91

N;.

REVEL

Uncertain

0.55

Sift

Benign

1.0

T;.

Sift4G

Benign

1.0

T;T

Polyphen

0.0

B;.

Vest4

0.21

MVP

0.43

MPC

0.20

ClinPred

0.0020

GERP RS

-5.4

Varity_R

0.027

gMVP

0.50

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

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