5-218349-A-C

Position:

• chr5-218349-A-C

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS1

The NM_004168.4(SDHA):​c.-7A>C variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.001 in 1,455,416 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00078 (0 hom., cov: 34)
  • Exomes 𝑓: 0.0010 (1 hom.)
• Consequence: SDHA NM_004168.4 5_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5 B:11
• Conservation: PhyloP100: 0.187

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]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.81).
• BP6: Variant 5-218349-A-C is Benign according to our data. Variant chr5-218349-A-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 371942.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=8, Uncertain_significance=5, Benign=1}. Variant chr5-218349-A-C is described in Lovd as [Likely_benign].
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000782 (119/152270) while in subpopulation NFE AF= 0.00118 (80/67998). AF 95% confidence interval is 0.000968. There are 0 homozygotes in gnomad4. There are 50 alleles in male gnomad4 subpopulation. Median coverage is 34. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SDHA	NM_004168.4	c.-7A>C		5_prime_UTR_variant	1/15	ENST00000264932.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SDHA	ENST00000264932.11	c.-7A>C		5_prime_UTR_variant	1/15	1	NM_004168.4	P1

Frequencies

GnomAD3 genomes AF: 0.000789 AC: 120 AN: 152162 Hom.: 0 Cov.: 34

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000785

Gnomad ASJ AF: 0.00288

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.00103

Gnomad FIN AF: 0.000189

Gnomad MID AF: 0.00318

Gnomad NFE AF: 0.00118

Gnomad OTH AF: 0.00191

GnomAD3 exomes AF: 0.000666 AC: 72 AN: 108066 Hom.: 0 AF XY: 0.000800 AC XY: 50 AN XY: 62516

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000280

Gnomad ASJ exome AF: 0.00185

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000885

Gnomad FIN exome AF: 0.000169

Gnomad NFE exome AF: 0.000793

Gnomad OTH exome AF: 0.00181

GnomAD4 exome AF: 0.00103 AC: 1341 AN: 1303146 Hom.: 1 Cov.: 31 AF XY: 0.00105 AC XY: 673 AN XY: 642938

Gnomad4 AFR exome AF: 0.0000374

Gnomad4 AMR exome AF: 0.000460

Gnomad4 ASJ exome AF: 0.00382

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00102

Gnomad4 FIN exome AF: 0.0000594

Gnomad4 NFE exome AF: 0.00105

Gnomad4 OTH exome AF: 0.00129

GnomAD4 genome AF: 0.000782 AC: 119 AN: 152270 Hom.: 0 Cov.: 34 AF XY: 0.000672 AC XY: 50 AN XY: 74454

Gnomad4 AFR AF: 0.000120

Gnomad4 AMR AF: 0.000784

Gnomad4 ASJ AF: 0.00288

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.000828

Gnomad4 FIN AF: 0.000189

Gnomad4 NFE AF: 0.00118

Gnomad4 OTH AF: 0.00189

Alfa AF: 0.0000530 Hom.: 0

Bravo AF: 0.000824

Asia WGS AF: 0.000290 AC: 1 AN: 3466

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:5 Benign:11

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Benign:5

Likely benign, no assertion criteria provided	clinical testing	Diagnostic Laboratory, Department of Genetics, University Medical Center Groningen	-	- -
Likely benign, no assertion criteria provided	clinical testing	Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+	-	- -
Likely benign, criteria provided, single submitter	clinical testing	Quest Diagnostics Nichols Institute San Juan Capistrano	Nov 01, 2022	- -
Likely benign, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Jul 01, 2024	SDHA: BS1 -
Likely benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Sep 20, 2017	- -

not specified Uncertain:1 Benign:2

Likely benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 01, 2017	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Oct 07, 2021	- -
Likely benign, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital	Aug 15, 2023	- -

Hereditary cancer-predisposing syndrome Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	curation	Sema4, Sema4	Oct 02, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Jul 03, 2015	The c.-7A>C alteration is located in the 5' untranslated region (5'UTR) of the SDHA gene. This alteration consists of a A to C substitution nucleotides upstream from the first translated codon. Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Paragangliomas 5 Uncertain:1 Benign:1

Likely benign, criteria provided, single submitter	clinical testing	Myriad Genetics, Inc.	Apr 21, 2023	This variant is considered likely benign. This variant has been observed at a population frequency that is significantly greater than expected given the associated disease prevalence and penetrance. -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Aug 31, 2016	- -

Mitochondrial complex II deficiency, nuclear type 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

Leigh syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

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

Likely benign, criteria provided, single submitter

clinical testing

Invitae

Oct 03, 2023

- -

Hereditary pheochromocytoma-paraganglioma Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Apr 27, 2017

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.81
CADD	Benign	8.2
DANN	Benign	0.32
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

Other links and lift over

dbSNP: rs751633537; hg19: chr5-218464;