rs1555186662

Variant names:

• chr11-112086923-AGGCT-A
• rs1555186662
• NM_003002.4:c.18_21delGCTG

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.18_21delGCTG​(p.Leu7ValfsTer7) 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. R6R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: SDHD NM_003002.4 frameshift
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2
• Conservation: PhyloP100: 2.41
• 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]

ENSG00000255292 (HGNC:):

TIMM8B (HGNC:11818): (translocase of inner mitochondrial membrane 8 homolog B) This gene encodes a member of a well-conserved family of proteins with similarity to yeast Tim mitochondrial import proteins. This gene is encoded by a nuclear gene and is transported into the intermembrane space of the mitochondrion. When formed into complexes, these proteins guide membrane-spanning proteins across the mitochondrial intermembrane space before they are added into the mitochondrial inner membrane. This gene is adjacent to succinate dehydrogenase, subunit D (SDHD), in which mutations have been found in affected members of families with hereditary paraganglioma.[provided by RefSeq, Aug 2009]

ACMG classification

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

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 122 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 11-112086923-AGGCT-A is Pathogenic according to our data. Variant chr11-112086923-AGGCT-A is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 547769.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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHD	NM_003002.4	MANE Select	c.18_21delGCTG	p.Leu7ValfsTer7	frameshift	Exon 1 of 4	NP_002993.1	O14521-1
	SDHD	NM_001276506.2		c.18_21delGCTG	p.Leu7ValfsTer7	frameshift	Exon 1 of 5	NP_001263435.1	O14521-4
	SDHD	NM_001276504.2		c.18_21delGCTG	p.Leu7ValfsTer7	frameshift	Exon 1 of 3	NP_001263433.1	O14521-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHD	ENST00000375549.8	TSL:1 MANE Select	c.18_21delGCTG	p.Leu7ValfsTer7	frameshift	Exon 1 of 4	ENSP00000364699.3	O14521-1
	SDHD	ENST00000528048.5	TSL:1	c.18_21delGCTG	p.Leu7ValfsTer7	frameshift	Exon 1 of 3	ENSP00000436217.1	O14521-3
	ENSG00000255292	ENST00000532699.1	TSL:3	n.18_21delGCTG		non_coding_transcript_exon	Exon 1 of 6	ENSP00000456434.1	H3BRW5

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

ClinVar submissions

Significance: Pathogenic/Likely pathogenic

Revision: criteria provided, multiple submitters, no conflicts

Pathogenic	VUS	Benign	Condition
1	-	-	Pheochromocytoma;C1847319:Carney-Stratakis syndrome;C1868633:Paragangliomas with sensorineural hearing loss;CN166604:Cowden syndrome 3 (1)
1	-	-	Pheochromocytoma/paraganglioma syndrome 1 (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.4

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1555186662; hg19: chr11-111957647;