NM_003002.4:c.147dupA

Variant names:

• chr11-112087950-T-TA
• rs876659130
• NM_003002.4:c.147dupA

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_003002.4(SDHD):​c.147dupA​(p.His50ThrfsTer19) 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 Likely pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. H50H) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SDHD NM_003002.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5
• Conservation: PhyloP100: -0.574
• Publications: 3 publications found

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]

SDHD Gene-Disease associations (from GenCC):

• hereditary pheochromocytoma-paraganglioma

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

  Inheritance: AD Classification: DEFINITIVE Submitted by: G2P
• pheochromocytoma/paraganglioma syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), G2P
• Carney-Stratakis syndrome

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Genomics England PanelApp, Orphanet
• mitochondrial complex II deficiency, nuclear type 1

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• renal cell carcinoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• mitochondrial complex 2 deficiency, nuclear type 3

  Inheritance: AR Classification: MODERATE Submitted by: Ambry Genetics
• mitochondrial complex II deficiency

  Inheritance: AR Classification: MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
• Cowden disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• intestinal cancer

  Inheritance: AD Classification: LIMITED Submitted by: G2P
• mitochondrial disease

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ENSG00000255292 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-112087950-T-TA is Pathogenic according to our data. Variant chr11-112087950-T-TA is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 231390.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_003002.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHD	NM_003002.4	MANE Select	c.147dupA	p.His50ThrfsTer19	frameshift	Exon 2 of 4	NP_002993.1
	SDHD	NM_001276506.2		c.147dupA	p.His50ThrfsTer19	frameshift	Exon 2 of 5	NP_001263435.1
	SDHD	NM_001276503.2		c.147dupA	p.His50ThrfsTer63	frameshift	Exon 2 of 3	NP_001263432.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHD	ENST00000375549.8	TSL:1 MANE Select	c.147dupA	p.His50ThrfsTer19	frameshift	Exon 2 of 4	ENSP00000364699.3
	SDHD	ENST00000528048.5	TSL:1	c.147dupA	p.His50ThrfsTer63	frameshift	Exon 2 of 3	ENSP00000436217.1
	ENSG00000255292	ENST00000532699.1	TSL:3	n.147dupA		non_coding_transcript_exon	Exon 2 of 6	ENSP00000456434.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5

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

Sep 22, 2024

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.His50Thrfs*19) 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 paraganglioma-pheochromocytoma syndromes (PMID: 12811540, 16314641). This variant is also known as c.147_148insA and c.148_149insA. ClinVar contains an entry for this variant (Variation ID: 231390). For these reasons, this variant has been classified as Pathogenic.

Pheochromocytoma Pathogenic:1

Jul 15, 2021

MGZ Medical Genetics Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Paraganglioma;C0031511:Pheochromocytoma Pathogenic:1

Feb 04, 2025

Clinical Genetics Laboratory, Skane University Hospital Lund

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

ACMG criteria used: PVS1, PS4, PM2.

Hereditary cancer-predisposing syndrome Pathogenic:1

Feb 16, 2023

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.147dupA pathogenic mutation, located in coding exon 2 of the SDHD gene, results from a duplication of A at position 147, causing a translational frameshift with a predicted alternate stop codon (p.H50Tfs*19). This mutation has been reported in an individual with hereditary paraganglioma (Astrom K et al. Hum Genet. 2003 Aug;113(3):228-37). 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.

Pheochromocytoma/paraganglioma syndrome 1 Pathogenic:1

Apr 09, 2024

Myriad Genetics, Inc.

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered pathogenic. This variant creates a frameshift predicted to result in premature protein truncation.

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.57
Mutation Taster		=0/200	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: rs876659130; hg19: chr11-111958674;