11-112088907-GGTT-G

Variant names:

• chr11-112088907-GGTT-G
• rs1555186992
• NM_003002.4:c.213_215delTGT

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM4_Supporting PP5_Moderate

The NM_003002.4(SDHD):​c.213_215delTGT​(p.Val72del) variant causes a disruptive inframe deletion change. 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. V71V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SDHD NM_003002.4 disruptive_inframe_deletion
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 5.95
• Publications: 0 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: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 33 uncertain in NM_003002.4
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_003002.4. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 11-112088907-GGTT-G is Pathogenic according to our data. Variant chr11-112088907-GGTT-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 486442.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SDHD	NM_003002.4	c.213_215delTGT	p.Val72del	disruptive_inframe_deletion	Exon 3 of 4	ENST00000375549.8	NP_002993.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SDHD	ENST00000375549.8	c.213_215delTGT	p.Val72del	disruptive_inframe_deletion	Exon 3 of 4	1	NM_003002.4	ENSP00000364699.3
ENSG00000255292	ENST00000532699.1	n.213_215delTGT		non_coding_transcript_exon_variant	Exon 3 of 6	3		ENSP00000456434.1

Frequencies

GnomAD3 genomes Cov.: 32

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Aug 15, 2019

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.213_215delTGT variant (also known as p.V72del) is located in coding exon 3 of the SDHD gene. This variant results in an in-frame deletion of 3 nucleotides at positions 213 to 215 and removes a highly-conserved valine residue at codon 72. This alteration was identified in a patient with an extra-adrenal paraganglioma (Ambry internal data). This alteration disrupts an alpha helix immediately adjacent to a crucial heme binding site resulting in mis-orientation of key residues for modulating heme function (Sun F et al. Cell. 2005 Jul; 121(7):1043-57; Ambry internal structural data). Additionally, using the the BDGP and ESEfinder splice site prediction tools, this alteration is predicted to create a new alternate splice donor site; however, direct evidence is unavailable. Based on the majority of available evidence to date, this alteration is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		6.0
Mutation Taster		=67/33	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs1555186992; hg19: chr11-111959631;