5-233504-C-T

Position:

chr5-233504-C-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM1PP3_StrongPP5

The NM_004168.4(SDHA):c.923C>T(p.Thr308Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000198 in 1,613,998 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T308A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000021 ( 0 hom. )

Consequence

SDHA
NM_004168.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:2

Conservation

PhyloP100: 6.98

Variant links:

Genes affected

SDHA (HGNC:10680): (succinate dehydrogenase complex flavoprotein subunit A) This gene encodes a major catalytic subunit of succinate-ubiquinone oxidoreductase, a complex of the mitochondrial respiratory chain. The complex is composed of four nuclear-encoded subunits and is localized in the mitochondrial inner membrane. Mutations in this gene have been associated with a form of mitochondrial respiratory chain deficiency known as Leigh Syndrome. A pseudogene has been identified on chromosome 3q29. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jun 2014]

SDHA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

PM1

In a binding_site (size 0) in uniprot entity SDHA_HUMAN

PP3

MetaRNN computational evidence supports a deleterious effect, 0.971

PP5

Variant 5-233504-C-T is Pathogenic according to our data. Variant chr5-233504-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 472416.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=3, Uncertain_significance=2}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHA	NM_004168.4 linkuse as main transcript	c.923C>T	p.Thr308Met	missense_variant	8/15	ENST00000264932.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHA	ENST00000264932.11 linkuse as main transcript	c.923C>T	p.Thr308Met	missense_variant	8/15	1	NM_004168.4	P1	P31040-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152158

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000795

AC:

AN:

251494

Hom.:

AF XY:

0.0000147

AC XY:

AN XY:

135920

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000212

AC:

AN:

1461840

Hom.:

Cov.:

AF XY:

0.0000234

AC XY:

AN XY:

727220

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000261

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152158

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74336

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:1Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 20, 2023	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 22577165, 35059314, 16935256, 29978154, 36980917, 23666964, 16371358, 30854332, 28500238, 27011036, 28546994) -
Uncertain significance, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -

Paragangliomas 5;C5700310:Mitochondrial complex II deficiency, nuclear type 1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Invitae

Dec 28, 2023

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 308 of the SDHA protein (p.Thr308Met). This variant is present in population databases (no rsID available, gnomAD 0.002%). This missense change has been observed in individuals with gastrointestinal stromal tumor, paragangliomas and/or pheochromocytomas (PMID: 28500238, 28546994; Invitae; external communication). ClinVar contains an entry for this variant (Variation ID: 472416). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on SDHA protein function. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic. -

Hereditary cancer-predisposing syndrome

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 19, 2024

The p.T308M variant (also known as c.923C>T), located in coding exon 8 of the SDHA gene, results from a C to T substitution at nucleotide position 923. The threonine at codon 308 is replaced by methionine, an amino acid with similar properties. The variant has been detected in multiple individuals with paraganglioma or gastrointestinal stromal tumor (Rattenberry E et al. J Clin Endocrinol Metab. 2013 Jul;98:E1248-56; Casey RT et al. Mol Genet Genomic Med. 2017 May;5:237-250; Tufton N et al. Endocr. Relat. Cancer. 2017 07;24:L43-L49; Ambry internal data). Based on internal structural analysis, T308M results in disruption of the succinate binding site (Huang LS et al. Biochim Biophys Acta. 2006 Jul;1757:1073-83; Huang LS et al. J Biol Chem. 2006 Mar;281:5965-72; Shimizu H et al. J Biochem. 2012 Jun;151:589-92). This variant is considered to be rare based on population cohorts in the Genome Aggregation Database (gnomAD). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Gastrointestinal stromal tumor

Uncertain:1

Uncertain significance, criteria provided, single submitter

research

“Giorgio Prodi” Cancer Research Center, University of Bologna

Oct 01, 2021

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.99

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.15

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.45

T;T;.;.

Eigen

Pathogenic

0.94

Eigen_PC

Pathogenic

0.77

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Pathogenic

1.0

D;D;D;D

M_CAP

Uncertain

0.19

MetaRNN

Pathogenic

0.97

D;D;D;D

MetaSVM

Uncertain

0.45

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.93

Sift4G

Uncertain

0.011

D;D;D;D

Polyphen

1.0

.;D;D;.

Vest4

0.94

MutPred

0.86

.;Loss of methylation at R312 (P = 0.1547);Loss of methylation at R312 (P = 0.1547);.;

MVP

0.83

MPC

1.4

ClinPred

0.98

GERP RS

4.5

Varity_R

0.86

gMVP

0.94

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over