11-112094876-T-TG

Position:

• chr11-112094876-T-TG

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_003002.4(SDHD):​c.388dup​(p.Ala130GlyfsTer61) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: SDHD NM_003002.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 1.19

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 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most exon, not predicted to undergo nonsense mediated mRNA decay. There are 14 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-112094876-T-TG is Pathogenic according to our data. Variant chr11-112094876-T-TG is described in ClinVar as [Pathogenic]. Clinvar id is 428937.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHD	NM_003002.4	c.388dup	p.Ala130GlyfsTer61	frameshift_variant	4/4	ENST00000375549.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHD	ENST00000375549.8	c.388dup	p.Ala130GlyfsTer61	frameshift_variant	4/4	1	NM_003002.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

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

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 05, 2023

This variant disrupts a region of the SDHD protein in which other variant(s) (p.Leu139Pro) have been determined to be pathogenic (PMID: 12114404, 21348866, 25758995). This suggests that this is a clinically significant region of the protein, and that variants that disrupt it are likely to be disease-causing. This sequence change results in a frameshift in the SDHD gene (p.Ala130Glyfs*61). While this is not anticipated to result in nonsense mediated decay, it is expected to disrupt the last 30 amino acid(s) of the SDHD protein and extend the protein by 30 additional amino acid residues. This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SDHD-related conditions. ClinVar contains an entry for this variant (Variation ID: 428937). For these reasons, this variant has been classified as Pathogenic. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 02, 2018

The c.388dupG pathogenic mutation, located in coding exon 4 of the SDHD gene, results from a duplication of G at position 388, causing a translational frameshift with a predicted alternate stop codon (p.A130Gfs*61). This frameshift occurs at the 3' terminus of SDHD, alters the final 30 amino acids of the protein, and results in the elongation of the protein by 30 residues. It has been identified in multiple unrelated patients with paragangliomas and pheochromocytomas (Ambry internal data). In addition, a close nucleotide change, c.386dupT, which results in the same stop codon, was reported in multiple probands with personal and family histories of paragangliomas (Lima J et al. J. Clin. Endocrinol. Metab. 2007 Dec;92(12):4853-64; Hermsen MA et al. Cell. Oncol. 2010 Jan;32(4):275-83). Based on the available evidence, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

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

Other links and lift over

dbSNP: rs1131691063; hg19: chr11-111965600;