chr9-133352145-G-GT

Position:

• chr9-133352145-G-GT

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_003172.4(SURF1):​c.752-4dupA variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000278 in 1,441,314 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000028 (0 hom.)
• Consequence: SURF1 NM_003172.4 splice_region, intron
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.05

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]

SURF1 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SURF1	NM_003172.4	c.752-4dupA		splice_region_variant, intron_variant		ENST00000371974.8	NP_003163.1
SURF1	NM_001280787.1	c.425-4dupA		splice_region_variant, intron_variant			NP_001267716.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SURF1	ENST00000371974.8	c.752-4dupA		splice_region_variant, intron_variant		1	NM_003172.4	ENSP00000361042.3
SURF1	ENST00000615505.4	c.425-4dupA		splice_region_variant, intron_variant		1		ENSP00000482067.1
SURF1	ENST00000437995.1	n.662-4dupA		splice_region_variant, intron_variant		5
SURF1	ENST00000495952.5	n.742-4dupA		splice_region_variant, intron_variant		2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000467 AC: 1 AN: 214186 Hom.: 0 AF XY: 0.00000867 AC XY: 1 AN XY: 115380

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: 0.0000107

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000278 AC: 4 AN: 1441314 Hom.: 0 Cov.: 33 AF XY: 0.00000559 AC XY: 4 AN XY: 715028

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: 0.00000272

Gnomad4 OTH exome AF: 0.0000168

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Leigh syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 28, 2022

This variant has not been reported in the literature in individuals affected with SURF1-related conditions. 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. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. ClinVar contains an entry for this variant (Variation ID: 526790). This variant is present in population databases (no rsID available, gnomAD 0.0009%). This sequence change falls in intron 7 of the SURF1 gene. It does not directly change the encoded amino acid sequence of the SURF1 protein. -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1159512660; hg19: chr9-136219000;