11-112087860-TG-T

Position:

• chr11-112087860-TG-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_003002.4(SDHD):​c.57del​(p.Leu20CysfsTer66) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000688 in 1,454,142 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: SDHD NM_003002.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:7
• Conservation: PhyloP100: 0.188

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 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 43 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-112087860-TG-T is Pathogenic according to our data. Variant chr11-112087860-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 6917.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr11-112087860-TG-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SDHD	NM_003002.4	c.57del	p.Leu20CysfsTer66	frameshift_variant	2/4	ENST00000375549.8	NP_002993.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SDHD	ENST00000375549.8	c.57del	p.Leu20CysfsTer66	frameshift_variant	2/4	1	NM_003002.4	ENSP00000364699	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.88e-7 AC: 1 AN: 1454142 Hom.: 0 Cov.: 29 AF XY: 0.00000138 AC XY: 1 AN XY: 723960

Gnomad4 AFR exome AF: 0.00

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: 0.00

Gnomad4 NFE exome AF: 9.05e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary pheochromocytoma-paraganglioma Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 17, 2020	Variant summary: SDHD c.57delG (p.Leu20CysfsX66) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 251434 control chromosomes. c.57delG has been reported in the literature in individuals from at-least one family affected with Hereditary Paraganglioma-Pheochromocytoma Syndrome/Carney-Stratakis dyad (McWhinney_2007, Pasini_2008, Ghayee_2009, Lodish_2010). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 citing overlapping evidence utilized in the context of this evaluation. All laboratories classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Jan 05, 2024	This variant deletes 1 nucleotide in exon 2 of the SDHD gene, creating a frameshift and 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 gastrointestinal stromal tumors and/or paragangliomas/pheochromocytomas (PMID: 17667967, 19075037, 20418362, 29386252, 34439168; DOI: 10.1530/EDM-20-0134). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). Loss of SDHD function is a known mechanism of disease (clinicalgenome.org). The available evidence is insufficient to determine the role of this variant in disease conclusively.Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, no assertion criteria provided	research	Section on Medical Neuroendocrinolgy, National Institutes of Health	-	- -

Pheochromocytoma;C1847319:Carney-Stratakis syndrome;C1868633:Paragangliomas with sensorineural hearing loss;CN166604:Cowden syndrome 3 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 10, 2024

This sequence change creates a premature translational stop signal (p.Leu20Cysfs*66) in the SDHD gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in SDHD are known to be pathogenic (PMID: 19454582, 19802898). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with gastrointestinal stromal tumor, pheochromocytoma, and multiple paragangliomas (PMID: 17667967). ClinVar contains an entry for this variant (Variation ID: 6917). For these reasons, this variant has been classified as Pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Apr 26, 2022

Observed in individuals with a personal or family history consistent with pathogenic variants in this gene (Pasini 2008, Andrews 2018, Caetano 2021); Frameshift 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 (gnomAD); This variant is associated with the following publications: (PMID: 17804857, 19075037, 17973943, 26916530, 23036227, 25741136, 27051561, 20418362, 29386252, Caetano2021[Case Report], 17667967, 30787465) -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

May 20, 2022

The c.57delG pathogenic mutation, located in coding exon 2 of the SDHD gene, results from a deletion of one nucleotide at nucleotide position 57, causing a translational frameshift with a predicted alternate stop codon (p.L20Cfs*66). This alteration has been previously identified in individuals with paraganglioma(s) and gastrointestinal stromal tumor (GIST) (Pasini B et al. Eur. J. Hum. Genet. 2008 Jan;16(1):79-88; Lodish MB et al. Endocr. Relat. Cancer 2010 Sep;17(3):581-8; Wang YM et al. World J. Gastroenterol. 2015 Feb;21(8):2303-14). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). 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. -

Carney-Stratakis syndrome Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Jan 01, 2008

- -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.20		Details are displayed if max score is > 0.2
DS_AL_spliceai		0.20		Position offset: -3

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs587776649; hg19: chr11-111958584;