1-161314408-G-A

Position:

• chr1-161314408-G-A

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PVS1 PS1_Moderate PM2 PP5_Very_Strong

The NM_003001.5(SDHC):​c.3G>A​(p.Met1?) variant causes a start lost change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SDHC NM_003001.5 start_lost
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:4
• Conservation: PhyloP100: 4.80

Genes affected

SDHC (HGNC:10682): (succinate dehydrogenase complex subunit C) This gene encodes one of four nuclear-encoded subunits that comprise succinate dehydrogenase, also known as mitochondrial complex II, a key enzyme complex of the tricarboxylic acid cycle and aerobic respiratory chains of mitochondria. The encoded protein is one of two integral membrane proteins that anchor other subunits of the complex, which form the catalytic core, to the inner mitochondrial membrane. There are several related pseudogenes for this gene on different chromosomes. Mutations in this gene have been associated with paragangliomas. Alternatively spliced transcript variants have been described. [provided by RefSeq, May 2013]

ACMG classification

Verdict is Pathogenic. Variant got 20 ACMG points.

• PVS1: Start lost variant, no new inframe start found.
• PS1: Another start lost variant in NM_003001.5 (SDHC) was described as [Pathogenic] in ClinVar as 653751
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-161314408-G-A is Pathogenic according to our data. Variant chr1-161314408-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 7241.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr1-161314408-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHC	NM_003001.5	c.3G>A	p.Met1?	start_lost	1/6	ENST00000367975.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHC	ENST00000367975.7	c.3G>A	p.Met1?	start_lost	1/6	1	NM_003001.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Paragangliomas 3 Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Jul 01, 2003	- -
Pathogenic, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Feb 15, 2024	This variant is considered pathogenic. This variant is located within the gene translation start codon (p.Met1?) and is predicted to result in abnormal protein translation. This variant has been reported in multiple individuals with clinical features of gene-specific disease [PMID: 11062460, 22351710, 25720320, 30201732]. -

Gastrointestinal stromal tumor;C1854336:Paragangliomas 3 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 20, 2019

For these reasons, this variant has been classified as Pathogenic. Experimental studies and prediction algorithms are not available for this variant, and the functional significance of the affected amino acid(s) is currently unknown. This variant has been observed to segregate with paraganglioma in two families (PMID: 11062460, 22351710). ClinVar contains an entry for this variant (Variation ID: 7241). This variant is not present in population databases (ExAC no frequency). This sequence change affects the initiator methionine of the SDHC mRNA. The next in-frame methionine is located at codon 38. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Sep 28, 2023

Initiation codon variant in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 28973655, 11062460, 22351710, 34703596, 32181896, 12658451, 11692162) -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.67
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.14	T;.;.;.;.
Eigen	Uncertain	0.30
Eigen_PC	Uncertain	0.38
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.90	D;D;D;D;D
M_CAP	Pathogenic	0.96	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationTaster	Benign	1.0	D;D;D;D;D
PROVEAN	Benign	-1.1	N;N;N;N;D
REVEL	Pathogenic	0.80
Sift	Pathogenic	0.0	D;D;D;D;D
Sift4G	Uncertain	0.032	D;D;D;D;D
Polyphen		0.043	B;B;B;P;D
Vest4		0.83
MutPred		0.98		Gain of catalytic residue at M1 (P = 0.0247);Gain of catalytic residue at M1 (P = 0.0247);Gain of catalytic residue at M1 (P = 0.0247);Gain of catalytic residue at M1 (P = 0.0247);Gain of catalytic residue at M1 (P = 0.0247);
MVP		0.90
ClinPred		1.0	D
GERP RS		5.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.94
gMVP		0.69

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

LitVar

Other links and lift over

dbSNP: rs587776652; hg19: chr1-161284198; COSMIC: COSV104631986; COSMIC: COSV104631986;