ClinVar Miner

Submissions for variant NM_003000.2(SDHB):c.725G>A (p.Arg242His) (rs74315368)

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Total submissions: 7
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Ambry Genetics RCV000129095 SCV000183806 pathogenic Hereditary cancer-predisposing syndrome 2017-12-27 criteria provided, single submitter clinical testing Lines of evidence used in support of classification: Detected in individual satisfying established diagnostic critera for classic disease without a clear mutation,Deficient protein function in appropriate functional assay(s),Well-characterized mutation at same position,Structural Evidence
GeneDx RCV000183216 SCV000235636 pathogenic not provided 2019-01-09 criteria provided, single submitter clinical testing This pathogenic variant is denoted SDHB c.725G>A at the cDNA level, p.Arg242His (R242H) at the protein level, and results in the change of an Arginine to a Histidine (CGC>CAC). This variant has been reported in a father and son with malignant paragangliomas, several individuals with both malignant and benign paraganglioma/ pheochromocytoma tumors, a young adult with a gastrointestinal stromal tumor, and a patient with an SDHB-deficient renal carcinoma (Young 2002, Neumann 2004, Persu 2008, Cascon 2009, Ghayee 2009, Sevilla 2009, Janeway 2011, Luiz 2013, Gill 2014, Rijken 2017). SDHB Arg242His was also observed in a patient with clinical and metabolic features suggestive of a mitochondrial disorder, for whom assays to interrogate mitochondrial dysfunction in cultured fibroblasts and muscle tissue revealed reduced complex II and III activities and SDHA and SDHB expression (Nesti 2015). While this patient also harbored a heteroplasmic MT-CYB variant which might have contributed to these laboratory findings, yeast-based assays interrogating each variant separately only found decreased complex II and III activities for the strain expressing the yeast corollary of SDHB Arg242His (Nesti 2015). Additionally, Kim et al. (2015) found SDHB Arg242His to significantly reduce SDH activity, while Dwight et al. (2017) demonstrated this variant to completely abrogate SDHAF3 interaction. SDHB Arg242His was not observed at a significant allele frequency in large population cohorts (Lek 2016). This variant is located in an L(I)YR motif required for interaction with Fe-S cluster transfer machinery and acquisition (Maio 2014, Saxena 2015). In silico analysis, which includes protein predictors and evolutionary conservation, supports a deleterious effect. Based on currently available evidence, we consider this variant to be pathogenic.
Invitae RCV000627751 SCV000644767 pathogenic Gastrointestinal stroma tumor; Paragangliomas 4; Pheochromocytoma 2018-12-28 criteria provided, single submitter clinical testing This sequence change replaces arginine with histidine at codon 242 of the SDHB protein (p.Arg242His). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and histidine. This variant is present in population databases (rs74315368, ExAC 0.01%). This variant has been reported in several individuals and families affected with sporadic and familial hereditary paragangliomas and/or pheochromocytomas (PMID: 12000816, 20208144, 24276837, 12213855, 17102084, 22270996), gastrointestinal stromal tumors (PMID: 21173220), and mitochondrial encephalomyopathy (PMID: 25736212). ClinVar contains an entry for this variant (Variation ID: 12781). Experimental studies using model organism have shown that this variant causes deleterious effects on several aspects of protein function (PMID: 25972245, 25736212, 22835832). For these reasons, this variant has been classified as Pathogenic.
OMIM RCV000013619 SCV000033866 pathogenic Paragangliomas 4 2011-01-04 no assertion criteria provided literature only
OMIM RCV000013620 SCV000033867 pathogenic Pheochromocytoma 2011-01-04 no assertion criteria provided literature only
OMIM RCV000022778 SCV000044067 pathogenic Gastrointestinal stroma tumor 2011-01-04 no assertion criteria provided literature only
Section on Medical Neuroendocrinolgy,National Institutes of Health RCV000505354 SCV000599525 pathogenic Hereditary Paraganglioma-Pheochromocytoma Syndromes no assertion criteria provided research

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