11-112094805-G-A

Position:

• chr11-112094805-G-A

Variant summary

Our verdict is Pathogenic. Variant got 15 ACMG points: 15P and 0B. PVS1_Strong PM2 PP3 PP5_Very_Strong

The NM_003002.4(SDHD):​c.315G>A​(p.Trp105Ter) variant causes a stop gained, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SDHD NM_003002.4 stop_gained, splice_region
• Scores: Splicing: ADA: 0.9789
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 9.58

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 15 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 16 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. Scorers claiming Uncertain: max_spliceai. No scorers claiming Benign.
• PP5: Variant 11-112094805-G-A is Pathogenic according to our data. Variant chr11-112094805-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 412497.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SDHD	NM_003002.4	c.315G>A	p.Trp105Ter	stop_gained, splice_region_variant	4/4	ENST00000375549.8	NP_002993.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SDHD	ENST00000375549.8	c.315G>A	p.Trp105Ter	stop_gained, splice_region_variant	4/4	1	NM_003002.4	ENSP00000364699	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

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

Labcorp Genetics (formerly Invitae), Labcorp

Jun 14, 2016

For these reasons, this variant has been classified as Pathogenic. This variant is not present in population databases (ExAC no frequency). This sequence change results in a premature translational stop signal in the last exon of the SDHD mRNA at codon 105 (p.Trp105*). While this is not anticipated to result in nonsense mediated decay, it is expected to create a truncated SDHD protein. While no functional studies have been performed to test the effects of this particular variant on SDHD protein function or stability, it deletes 55 C-terminal amino acid residues from the SDHD protein. A founder mutation (p.Leu139Pro) has been reported in this region (PMID: 21348866, 11391798), and a downstream truncating variant has been classified as likely pathogenic in the Invitae database, indicating that the C-terminal amino acid residues may be critical for SDHD function. This particular variant has not been reported in the literature, but a different variant (c.314G>A) with the same protein effect (p.Trp105*) has been reported in an individual affected with pheochromocytomas (PCC) and paragangliomas (PGL) (PMID: 23512077). -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 11, 2016

The p.W105* pathogenic mutation (also known as c.315G>A), located in coding exon 4 of the SDHD gene, results from a G to A substitution at nucleotide position 315. This changes the amino acid from a tryptophan to a stop codon within coding exon 4. An adjacent nucleotide change, c.314G>A, which results in the same stop codon, was reported in multiple patients diagnosed with paragangliomas (Fishbein L et al. Ann Surg Oncol. 2013 May;20(5):1444-50). Based on the available evidence, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	43
DANN	Uncertain	0.99
Eigen	Pathogenic	1.2
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.25	T
MetaRNN	Pathogenic	0.78	D
MetaSVM	Benign	-0.44	T
MutationTaster	Benign	1.0	D;D;D;D;D
PROVEAN	Uncertain	-3.2	D
REVEL	Pathogenic	0.90
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.034	D
Vest4		0.54
MutPred		0.62		Loss of catalytic residue at G103 (P = 0.0373);
MVP		0.96
ClinPred		0.99	D
GERP RS		4.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Pathogenic	0.84
SpliceAI score (max)		0.33		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.33		Position offset: 2

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

Publications

LitVar

Other links and lift over

dbSNP: rs1060503769; hg19: chr11-111965529;