9-133352593-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM1 PM2

The NM_003172.4(SURF1):c.604G>A(p.Asp202Asn) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,850 control chromosomes in the GnomAD database, with no homozygous occurrence. 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. D202H) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SURF1 NM_003172.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.82

Genes affected

SURF1 (HGNC:11474): (SURF1 cytochrome c oxidase assembly factor) This gene encodes a protein localized to the inner mitochondrial membrane and thought to be involved in the biogenesis of the cytochrome c oxidase complex. The protein is a member of the SURF1 family, which includes the related yeast protein SHY1 and rickettsial protein RP733. The gene is located in the surfeit gene cluster, a group of very tightly linked genes that do not share sequence similarity, where it shares a bidirectional promoter with SURF2 on the opposite strand. Defects in this gene are a cause of Leigh syndrome, a severe neurological disorder that is commonly associated with systemic cytochrome c oxidase deficiency. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_003172.4
• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SURF1	NM_003172.4	c.604G>A	p.Asp202Asn	missense_variant	7/9	ENST00000371974.8
SURF1	NM_001280787.1	c.277G>A	p.Asp93Asn	missense_variant	6/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SURF1	ENST00000371974.8	c.604G>A	p.Asp202Asn	missense_variant	7/9	1	NM_003172.4	P1
SURF1	ENST00000615505.4	c.277G>A	p.Asp93Asn	missense_variant	6/8	1
SURF1	ENST00000437995.1	n.514G>A		non_coding_transcript_exon_variant	6/8	5
SURF1	ENST00000495952.5	n.594G>A		non_coding_transcript_exon_variant	3/5	2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461850 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 727210

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.032	T
BayesDel_noAF	Benign	-0.19
Cadd	Benign	21
Dann	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;.
Eigen	Benign	0.15
Eigen_PC	Uncertain	0.31
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Uncertain	0.17	D
MetaRNN	Uncertain	0.71	D;D
MetaSVM	Uncertain	0.37	D
MutationAssessor	Benign	1.7	L;.
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.37	T
PROVEAN	Uncertain	-3.0	D;.
REVEL	Uncertain	0.45
Sift	Uncertain	0.0060	D;.
Sift4G	Uncertain	0.013	D;D
Polyphen		0.13	B;.
Vest4		0.46
MutPred		0.39		Gain of catalytic residue at D202 (P = 0.117);.;
MVP		0.88
MPC		0.028
ClinPred		0.97	D
GERP RS		5.4
Varity_R		0.35
gMVP		0.57

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs72619327; hg19: chr9-136219448;