19-35995320-C-A

Variant names:

• chr19-35995320-C-A
• rs777257006
• NM_001042631.3:c.46C>A

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP2 PP3_Moderate

The NM_001042631.3(SDHAF1):​c.46C>A​(p.Arg16Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000716 in 1,395,980 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R16C) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 34)
  • Exomes 𝑓: 7.2e-7 (0 hom.)
• Consequence: SDHAF1 NM_001042631.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.67
• Publications: 0 publications found

Genes affected

SDHAF1 (HGNC:33867): (succinate dehydrogenase complex assembly factor 1) The succinate dehydrogenase (SDH) complex (or complex II) of the mitochondrial respiratory chain is composed of 4 individual subunits. The protein encoded by this gene resides in the mitochondria, and is essential for SDH assembly, but does not physically associate with the complex in vivo. Mutations in this gene are associated with SDH-defective infantile leukoencephalopathy (mitochondrial complex II deficiency).[provided by RefSeq, Mar 2010]

SDHAF1 Gene-Disease associations (from GenCC):

• mitochondrial complex 2 deficiency, nuclear type 2

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: G2P, PanelApp Australia
• mitochondrial disease

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• mitochondrial complex II deficiency, nuclear type 1

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• mitochondrial complex II deficiency

  Inheritance: AR Classification: MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
• Leigh syndrome

  Inheritance: AR Classification: LIMITED Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 4 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 0.37914 (below the threshold of 3.09). Trascript score misZ: -2.4355 (below the threshold of 3.09). GenCC associations: The gene is linked to mitochondrial complex II deficiency, nuclear type 1, Leigh syndrome, mitochondrial complex 2 deficiency, nuclear type 2, mitochondrial complex II deficiency, mitochondrial disease.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.937

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001042631.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHAF1	NM_001042631.3	MANE Select	c.46C>A	p.Arg16Ser	missense	Exon 1 of 1	NP_001036096.2	A6NFY7

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SDHAF1	ENST00000378887.4	TSL:6 MANE Select	c.46C>A	p.Arg16Ser	missense	Exon 1 of 1	ENSP00000368165.2	A6NFY7

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome AF: 7.16e-7 AC: 1 AN: 1395980 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 690174

African (AFR) AF: 0.00 AC: 0 AN: 32184

American (AMR) AF: 0.00 AC: 0 AN: 36512

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25186

East Asian (EAS) AF: 0.00 AC: 0 AN: 37098

South Asian (SAS) AF: 0.00 AC: 0 AN: 80350

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 35870

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4776

European-Non Finnish (NFE) AF: 9.21e-7 AC: 1 AN: 1085792

Other (OTH) AF: 0.00 AC: 0 AN: 58212

GnomAD4 genome Cov.: 34

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.93
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	31
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.51	D
Eigen	Pathogenic	0.73
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.97	D
M_CAP	Pathogenic	0.55	D
MetaRNN	Pathogenic	0.94	D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.5	M
PhyloP100		2.7
PrimateAI	Pathogenic	0.80	T
PROVEAN	Pathogenic	-5.1	D
REVEL	Pathogenic	0.73
Sift	Uncertain	0.0020	D
Sift4G	Uncertain	0.0050	D
Polyphen		1.0	D
Vest4		0.69
MutPred		0.79		Gain of phosphorylation at R16 (P = 0.0767)
MVP		0.68
MPC		2.4
ClinPred		1.0	D
GERP RS		5.8
PromoterAI		-0.042	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.97
gMVP		0.71
Mutation Taster		=47/53	disease causing

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

Other links and lift over

dbSNP: rs777257006; hg19: chr19-36486222;