rs747198089

Variant names:

• chr1-17044872-TG-T
• rs747198089
• NM_003000.3:c.88delC

Variant summary

Our verdict is Pathogenic. The variant received 16 ACMG points: 16P and 0B. PVS1 PP5_Very_Strong

The NM_003000.3(SDHB):​c.88delC​(p.Gln30ArgfsTer47) variant causes a frameshift change. The variant allele was found at a frequency of 0.00000753 in 1,461,706 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Q30Q) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000075 (0 hom.)
• Consequence: SDHB NM_003000.3 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 7.12
• Publications: 8 publications found

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 Gene-Disease associations (from GenCC):

• Carney-Stratakis syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet
• gastrointestinal stromal tumor

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• hereditary pheochromocytoma-paraganglioma

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• pheochromocytoma

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• pheochromocytoma/paraganglioma syndrome 4

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• renal cell carcinoma

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• mitochondrial complex 2 deficiency, nuclear type 4

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Cowden disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• mitochondrial complex II deficiency

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 16 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 239 pathogenic variants in the truncated region.
• PP5: Variant 1-17044872-TG-T is Pathogenic according to our data. Variant chr1-17044872-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 186518.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SDHB	NM_003000.3	c.88delC	p.Gln30ArgfsTer47	frameshift_variant	Exon 2 of 8	ENST00000375499.8	NP_002991.2
SDHB	NM_001407361.1	c.88delC	p.Gln30ArgfsTer47	frameshift_variant	Exon 2 of 8		NP_001394290.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SDHB	ENST00000375499.8	c.88delC	p.Gln30ArgfsTer47	frameshift_variant	Exon 2 of 8	1	NM_003000.3	ENSP00000364649.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251110 AF XY: 0.00

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000881

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000753 AC: 11 AN: 1461706 Hom.: 0 Cov.: 32 AF XY: 0.0000110 AC XY: 8 AN XY: 727174

African (AFR) AF: 0.00 AC: 0 AN: 33478

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39696

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53286

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000989 AC: 11 AN: 1111968

Other (OTH) AF: 0.00 AC: 0 AN: 60392

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:1

Apr 12, 2024

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SDHB c.88del (p.Gln30Argfs*47) variant alters the translational reading frame of the SDHB mRNA and causes the premature termination of SDHB protein synthesis. This variant has been reported in the published literature in in individuals with hereditary paraganglioma-pheochromocytoma (PGL-PCC) syndrome (PMID: 12618761 (2003), 19454582 (2009), 19596260 (2009), 23072324 (2013)) and renal cell carcinoma (PMID: 24395865 (2014)). The frequency of this variant in the general population, 0.000032 (1/30914 chromosomes (Genome Aggregation Database, http://gnomad.broadinstitute.org)), is consistent with pathogenicity. Based on the available information, this variant is classified as pathogenic. -

Pheochromocytoma;C0238198:Gastrointestinal stromal tumor;C1861848:Pheochromocytoma/paraganglioma syndrome 4 Pathogenic:1

Jun 17, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change creates a premature translational stop signal (p.Gln30Argfs*47) 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 (rs747198089, gnomAD 0.0009%). This premature translational stop signal has been observed in individual(s) with clinical features of hereditary paraganglioma-pheochromocytoma (PGL-PCC) syndrome (PMID: 12618761, 19596260, 24395865). ClinVar contains an entry for this variant (Variation ID: 186518). For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Mar 17, 2025

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.88delC pathogenic mutation, located in coding exon 2 of the SDHB gene, results from a deletion of one nucleotide at position 88, causing a translational frameshift with a predicted alternate stop codon. This alteration has been identified in multiple individuals in the literature who had a personal and/or family history of PGL/PCC (Benn DE et al. J. Med. Genet. 2018 Nov;55(11):729-734; Andrews KA et al. J. Med. Genet. 2018 Jun;55(6):384-394), including a 12-year-old male diagnosed with an abdominal PGL/PCC (Benn, DE et al. Oncogene. 2003 Mar 6;22(9):1358-64), and a 13-year-old male diagnosed with 3 simultaneous extra-adrenal PGLs whose tumor showed loss of heterozygosity (LOH) at the SDHB locus (Prasad P et al. Cancer Genet Cytogenet. 2009;192(2):82-85). This mutation has also been reported in an individual diagnosed with bilateral renal carcinoma at age 27. His unaffected mother was also a carrier and there was no known family history of PGL/PCC (Paik, JY et al. J Clin Oncol. 2014 Feb 20;32(6):e10-3). Functional studies of this alteration have demonstrated the absence of SDH enzymatic activity as well as the absence of SDHB protein in cell-based assays when compared to wildtype, indicating nonsense-mediated mRNA decay or protein degradation as a mechanism for absent enzymatic activity (Kim E, Endocr. Relat. Cancer 2015 Jun; 22(3):387-97). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). As such, this alteration is interpreted as a disease-causing mutation. -

Hereditary pheochromocytoma-paraganglioma Pathogenic:1

-

Section on Medical Neuroendocrinolgy, National Institutes of Health

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: research

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		7.1
Mutation Taster		=2/198	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs747198089; hg19: chr1-17371367;