rs1555187635

chr11-112094933-GC-TT

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1 PM5 PP3 PP5_Moderate

The NM_003002.4(SDHD):c.443_444delinsTT(p.Gly148Val) variant causes a missense change involving the alteration of a conserved nucleotide. Variant has been reported in ClinVar as Likely pathogenic (★). Another nucleotide change resulting in same amino acid change has been previously reported as Uncertain significancein ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G148D) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SDHD NM_003002.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• 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 Likely_pathogenic. Variant got 7 ACMG points.

• PM1: In a chain Succinate dehydrogenase [ubiquinone] cytochrome b small subunit, mitochondrial (size 102) in uniprot entity DHSD_HUMAN there are 64 pathogenic changes around while only 7 benign (90%) in NM_003002.4
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr11-112094933-G-A is described in Lovd as [Likely_pathogenic].
• PP3: No computational evidence supports a deleterious effect, but strongly conserved according to phyloP
• PP5: Variant 11-112094933-GC-TT is Pathogenic according to our data. Variant chr11-112094933-GC-TT is described in ClinVar as [Likely_pathogenic]. Clinvar id is 480776.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHD	NM_003002.4	c.443_444delinsTT	p.Gly148Val	missense_variant	4/4	ENST00000375549.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHD	ENST00000375549.8	c.443_444delinsTT	p.Gly148Val	missense_variant	4/4	1	NM_003002.4	P1

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 20, 2017

The c.443_444delGCinsTT variant (also known as p.G148V), located in coding exon 4 of the SDHD gene, results from an in-frame deletion of GC and insertion of TT between nucleotide positions 443 and 444. This results in the substitution of a glycine for a valine residue at codon 148, an amino acid with dissimilar properties. This variant has not been previously reported in the literature. However, the c.443G>T variant, which results in the same amino acid change p.G148V, has been reported in a 49 year old German female diagnosed with a head and neck paraganglioma (Neumann et al. JAMA. 2004;292:943-951). In addition a similar alteration, the c.443G>A variant, which results in the amino acid change p.G148D, has been reported in two French families with history of paragangliomas (Benn DE et al. J Clin Endocrinol Metab. 2006;91:927-836; Timmers HJLM et al. Clin Endocrinol. 2008:68:561-566). This amino acid position is highly conserved in available species. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs1555187635; hg19: chr11-111965657;