2-206766664-T-C

Position:

• chr2-206766664-T-C

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_Strong BP6 BS1 BS2

The NM_001136193.2(FASTKD2):​c.-30T>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 0.000464 in 1,600,410 control chromosomes in the GnomAD database, including 4 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 0.0024 (2 hom., cov: 32)
  • Exomes 𝑓: 0.00026 (2 hom.)
• Consequence: FASTKD2 NM_001136193.2 5_prime_UTR
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:1
• Conservation: PhyloP100: 0.469

Genes affected

FASTKD2 (HGNC:29160): (FAST kinase domains 2) This gene encodes a protein that is localized in the mitochondrial inner compartment and that may play a role in mitochondrial apoptosis. Nonsense mutations have been reported to result in cytochrome c oxidase deficiency. [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Benign. Variant got -13 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.83).
• BP6: Variant 2-206766664-T-C is Benign according to our data. Variant chr2-206766664-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 333798.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00238 (363/152350) while in subpopulation AFR AF= 0.00825 (343/41568). AF 95% confidence interval is 0.00753. There are 2 homozygotes in gnomad4. There are 174 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FASTKD2	NM_001136193.2	c.-30T>C		5_prime_UTR_variant	2/12	ENST00000402774.8	NP_001129665.1
FASTKD2	NM_001136194.2	c.-30T>C		5_prime_UTR_variant	2/12		NP_001129666.1
FASTKD2	NM_014929.4	c.-30T>C		5_prime_UTR_variant	2/12		NP_055744.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FASTKD2	ENST00000402774.8	c.-30T>C		5_prime_UTR_variant	2/12	1	NM_001136193.2	ENSP00000385990	P1

Frequencies

GnomAD3 genomes AF: 0.00238 AC: 363 AN: 152232 Hom.: 2 Cov.: 32

Gnomad AFR AF: 0.00828

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000850

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: 0.0000294

Gnomad OTH AF: 0.00239

GnomAD3 exomes AF: 0.000635 AC: 159 AN: 250348 Hom.: 0 AF XY: 0.000545 AC XY: 74 AN XY: 135768

Gnomad AFR exome AF: 0.00850

Gnomad AMR exome AF: 0.000434

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: 0.0000618

Gnomad OTH exome AF: 0.000492

GnomAD4 exome AF: 0.000262 AC: 380 AN: 1448060 Hom.: 2 Cov.: 29 AF XY: 0.000258 AC XY: 186 AN XY: 721252

Gnomad4 AFR exome AF: 0.00896

Gnomad4 AMR exome AF: 0.000358

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000349

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000146

Gnomad4 OTH exome AF: 0.000767

GnomAD4 genome AF: 0.00238 AC: 363 AN: 152350 Hom.: 2 Cov.: 32 AF XY: 0.00234 AC XY: 174 AN XY: 74492

Gnomad4 AFR AF: 0.00825

Gnomad4 AMR AF: 0.000849

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00237

Alfa AF: 0.00141 Hom.: 0

Bravo AF: 0.00282

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Mitochondrial complex IV deficiency, nuclear type 1 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Aug 09, 2016

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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.83
CADD	Benign	8.6
DANN	Benign	0.69
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: rs145438423; hg19: chr2-207631388;