rs74315370

Positions:

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_003000.3(SDHB):c.136C>T(p.Arg46Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000105 in 1,613,622 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000089 ( 0 hom. )

Consequence

SDHB
NM_003000.3 stop_gained

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:11U:1

Conservation

PhyloP100: 1.56

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 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 1-17044825-G-A is Pathogenic according to our data. Variant chr1-17044825-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 142763.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-17044825-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SDHB	NM_003000.3 linkuse as main transcript	c.136C>T	p.Arg46Ter	stop_gained	2/8	ENST00000375499.8	NP_002991.2
SDHB	NM_001407361.1 linkuse as main transcript	c.136C>T	p.Arg46Ter	stop_gained	2/8		NP_001394290.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SDHB	ENST00000375499.8 linkuse as main transcript	c.136C>T	p.Arg46Ter	stop_gained	2/8	1	NM_003000.3	ENSP00000364649	P1

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000189

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000159

AC:

AN:

251342

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135850

show subpopulations

Gnomad AFR exome

AF:

0.0000615

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:

0.0000926

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000890

AC:

AN:

1461472

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

727056

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

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:

0.0000375

Gnomad4 NFE exome

AF:

0.00000900

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152150

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74318

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000189

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:11Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Paragangliomas 4

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Color Diagnostics, LLC DBA Color Health	May 01, 2023	This variant changes 1 nucleotide in exon 2 of the SDHB gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in individuals affected with pheochromocytoma/paraganglioma (PMID: 19075037, 19454582, 21348866, 21909610, 23797725, 27539324, 28944243, 30122763). This variant has been identified in 5/282738 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of SDHB function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Human Genetics, Inc, Center for Human Genetics, Inc	Nov 01, 2016	- -
Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Feb 08, 2024	This variant is considered pathogenic. This variant creates a termination codon and is predicted to result in premature protein truncation. -

Hereditary pheochromocytoma-paraganglioma

Pathogenic:3

Pathogenic, no assertion criteria provided	research	Section on Medical Neuroendocrinolgy, National Institutes of Health	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Feb 05, 2024	This variant changes 1 nucleotide in exon 2 of the SDHB gene, creating a premature translation stop signal. This variant is expected to result in an absent or non-functional protein product. This variant has been reported in individuals affected with pheochromocytoma/paraganglioma (PMID: 19075037, 19454582, 21348866, 21909610, 23797725, 27539324, 28944243, 30122763). This variant has been identified in 5/282738 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of SDHB function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	Aug 10, 2020	The p.Arg46X variant in SDHB has been reported in 11 individuals with SDHB-associated tumors and segregated with disease in 5 affected individuals from 3 families (Ricketts 2008 PMID:18728283, Srirangalingam 2008 PMID:18419787, Ghayee 2009 PMID:19075037, Hensen 2012 PMID:21348866, Mason 2013 PMID:23797725, Pandit 2016 PMID:27539324, Richter 2019 PMID:30050099). It has also been identified in 0.014% (1/7218) of "Other" or 0.008% of Finnish (2/25082) chromosomes by gnomAD (http://gnomad.broadinstitute.org). This variant has also been reported in ClinVar (Variation ID 142763). This nonsense variant leads to a premature termination codon at position 46, which is predicted to lead to a truncated or absent protein. Heterozygous loss of function of the SDHB gene is an established disease mechanism in autosomal dominant hereditary paraganglioma and pheochromocytoma. In summary, this variant meets criteria to be classified as pathogenic for autosomal dominant hereditary paraganglioma and pheochromocytoma. ACMG/AMP Criteria applied: PVS1, PS4_Moderate, PM2_Supporting, PP1_Moderate -

not provided

Pathogenic:1Uncertain:1

Uncertain significance, no assertion criteria provided	research	Gharavi Laboratory, Columbia University	Sep 16, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Oct 22, 2021	Nonsense 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 (Lek et al., 2016); This variant is associated with the following publications: (PMID: 20418362, 21348866, 27539324, 12618761, 18728283, 23797725, 16405730, 19075037, 18419787, 16912137, 18840642, 19454582, 16317055, 22517557, 17102084, 26916530, 28374168, 28204537, 28152038, 30050099, 30122763, 31851316, 29623478, 30694796, 32082649, 30871634, 31492822, 29625052, 32741965, 33087929, 30787465) -

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

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 09, 2024

This sequence change creates a premature translational stop signal (p.Arg46*) in the SDHB gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SDHB are known to be pathogenic (PMID: 19454582, 19802898). This variant is present in population databases (rs74315370, gnomAD 0.01%). This premature translational stop signal has been observed in individual(s) with pheochromocytoma, paraganglioma, and renal cell carcinoma (PMID: 12618761, 16405730, 18728283, 21348866, 23797725). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 142763). For these reasons, this variant has been classified as Pathogenic. -

Gastrointestinal stromal tumor

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Dec 27, 2023

- -

Hereditary cancer-predisposing syndrome

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2022

The p.R46* pathogenic mutation (also known as c.136C>T), located in coding exon 2 of the SDHB gene, results from a C to T substitution at nucleotide position 136. This changes the amino acid from an arginine to a stop codon within coding exon 2. This mutation has been reported multiple times as a disease-causing mutation in patients with PGL-PCC or renal cell carcinoma (Benn DE et al. Oncogene. 2003 Mar;22:1358-64; Benn DE et al. J. Clin. Endocrinol. Metab. 2006 Mar;91:827-36; Brouwers FM et al. J. Clin. Endocrinol. Metab. 2006 Nov;91:4505-9; Srirangalingam U et al. Clin. Endocrinol. 2008 Oct;69:587-96; Ricketts C et al. J. Natl. Cancer Inst. 2008 Sep;100:1260-2; Ghayee HK et al. Endocr. Relat. Cancer. 2009 Mar;16:291-9; Bayley JP et al. BMC Med. Genet. 2006 Jan;7:1; Mason EF et al. Am. J. Surg. Pathol. 2013 Oct;37:1612-8; Pandit R et al. Eur. J. Endocrinol. 2016 Oct;175(4):311-23; Chew WHW et al. Mol Genet Genomic Med. 2017 Sep;5(5):602-607). In addition to the clinical data presented in the literature, this alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation. -

SDHB-related disorder

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Greenwood Genetic Center Diagnostic Laboratories, Greenwood Genetic Center

Mar 28, 2024

PVS1, PS4 -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Pathogenic

0.50

BayesDel_noAF

Pathogenic

0.58

CADD

Pathogenic

DANN

Uncertain

1.0

Eigen

Uncertain

0.60

Eigen_PC

Uncertain

0.44

FATHMM_MKL

Uncertain

0.85

MutationTaster

Benign

1.0

Vest4

0.92

GERP RS

2.4

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