rs377509915

Positions:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 0P and 2B. BP4BP6

The NM_004168.4(SDHA):c.955A>C(p.Ile319Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000169 in 1,614,078 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00014 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00017 ( 0 hom. )

Consequence

SDHA
NM_004168.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:8B:2

Conservation

PhyloP100: 6.39

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_benign. Variant got -2 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.26814312).

BP6

Variant 5-233536-A-C is Benign according to our data. Variant chr5-233536-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 412364.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=2, Uncertain_significance=8}. Variant chr5-233536-A-C is described in Lovd as [Likely_benign].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SDHA	NM_004168.4 linkuse as main transcript	c.955A>C	p.Ile319Leu	missense_variant	8/15	ENST00000264932.11	NP_004159.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SDHA	ENST00000264932.11 linkuse as main transcript	c.955A>C	p.Ile319Leu	missense_variant	8/15	1	NM_004168.4	ENSP00000264932	P1	P31040-1

Frequencies

GnomAD3 genomes

AF:

0.000138

AC:

AN:

152230

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

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:

0.000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000147

AC:

AN:

251496

Hom.:

AF XY:

0.000162

AC XY:

AN XY:

135922

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000299

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000172

AC:

251

AN:

1461848

Hom.:

Cov.:

AF XY:

0.000172

AC XY:

125

AN XY:

727230

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000216

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000138

AC:

AN:

152230

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000241

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:

0.000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000230

Hom.:

Bravo

AF:

0.000147

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000157

AC:

EpiCase

AF:

0.000273

EpiControl

AF:

0.000711

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:8Benign:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:1

Uncertain significance, criteria provided, single submitter	clinical testing	Institute for Clinical Genetics, University Hospital TU Dresden, University Hospital TU Dresden	Nov 03, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	GeneDx	Feb 21, 2022	Reported in an individual with paraganglioma/pheochromocytoma (Ben Aim et al., 2019); In silico analysis supports that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 30877234) -
Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Jun 19, 2023	- -

not specified

Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Feb 06, 2024	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Mar 02, 2020	DNA sequence analysis of the SDHA gene demonstrated a sequence change, c.955A>C, in exon 8 that results in an amino acid change, p.Ile319Leu. This sequence change has previously been described in a patient with pheochromocytoma in a heterozygous state; this patient also carried a pathogenic missense change in the RET gene (PMID: 30877234). This sequence change has been described in the gnomAD database with a population frequency of 0.029% in non-Finnish European population (dbSNP rs377509915). The p.Ile319Leu change affects a highly conserved amino acid residue located in a domain of the SDHA protein that is known to be functional. In-silico pathogenicity prediction tools (SIFT, PolyPhen2, Align GVGD, REVEL) provide contradictory results for the p.Ile319Leu substitution. Due to these contrasting evidences and the lack of functional studies, the clinical significance of the p.Ile319Leu change remains unknown at this time. -

Hereditary cancer-predisposing syndrome

Uncertain:1Benign:1

Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Feb 17, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jan 19, 2023	The p.I319L variant (also known as c.955A>C), located in coding exon 8 of the SDHA gene, results from an A to C substitution at nucleotide position 955. The isoleucine at codon 319 is replaced by leucine, an amino acid with highly similar properties. This variant was reported in a female patient diagnosed at age 18 with a benign pheochromocytoma; however, this individual was also heterozygous for a well-established RET mutation, p.C634R (Ben Aim L et al. J Med Genet, 2019 08;56:513-520). This alteration was also detected in 1/224 unrelated Brazilian individuals with breast cancer (Sandoval RL et al. PLoS One, 2021 Feb;16:e0247363). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 29, 2024

This sequence change replaces isoleucine, which is neutral and non-polar, with leucine, which is neutral and non-polar, at codon 319 of the SDHA protein (p.Ile319Leu). This variant is present in population databases (rs377509915, gnomAD 0.03%). This missense change has been observed in individual(s) with clinical features of SDHA-related conditions (Invitae). ClinVar contains an entry for this variant (Variation ID: 412364). 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) performed at Invitae indicates that this missense variant is not expected to disrupt SDHA protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Dilated cardiomyopathy 1GG

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 24, 2024

- -

Leigh syndrome;C3150898:Dilated cardiomyopathy 1GG;C3279992:Paragangliomas 5;C5700310:Mitochondrial complex II deficiency, nuclear type 1

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.084

BayesDel_addAF

Benign

-0.23

BayesDel_noAF

Benign

-0.26

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.24

T;T;.;.

Eigen

Benign

-0.29

Eigen_PC

Benign

-0.059

FATHMM_MKL

Uncertain

0.96

LIST_S2

Pathogenic

0.98

D;D;D;D

M_CAP

Benign

0.023

MetaRNN

Benign

0.27

T;T;T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.55

.;N;.;.

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.90

PROVEAN

Benign

-0.32

.;N;N;N

REVEL

Benign

0.20

Sift

Benign

0.80

.;T;T;T

Sift4G

Benign

0.92

T;T;T;T

Polyphen

0.0

.;B;B;.

Vest4

0.46

MVP

0.61

MPC

0.48

ClinPred

0.098

GERP RS

4.5

Varity_R

0.39

gMVP

0.74

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