chr20-3889158-T-C

Position:

• chr20-3889158-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000702266.1(PANK2-AS1):​n.16A>G variant causes a non coding transcript exon change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000104 in 1,443,398 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.000010 (0 hom.)
• Consequence: PANK2-AS1 ENST00000702266.1 non_coding_transcript_exon
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0190

Genes affected

PANK2 (HGNC:15894): (pantothenate kinase 2) This gene encodes a protein belonging to the pantothenate kinase family and is the only member of that family to be expressed in mitochondria. Pantothenate kinase is a key regulatory enzyme in the biosynthesis of coenzyme A (CoA) in bacteria and mammalian cells. It catalyzes the first committed step in the universal biosynthetic pathway leading to CoA and is itself subject to regulation through feedback inhibition by acyl CoA species. Mutations in this gene are associated with HARP syndrome and pantothenate kinase-associated neurodegeneration (PKAN), formerly Hallervorden-Spatz syndrome. Alternative splicing, involving the use of alternate first exons, results in multiple transcripts encoding different isoforms. [provided by RefSeq, Jul 2008]

PANK2-AS1 (HGNC:40732): (PANK2 antisense RNA 1)

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08123228).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PANK2-AS1	XR_001754478.3	n.16A>G		non_coding_transcript_exon_variant	1/2
PANK2	NM_153638.4	c.58T>C	p.Ser20Pro	missense_variant	1/7		NP_705902.2
PANK2	NM_001324192.1	c.58T>C	p.Ser20Pro	missense_variant	1/2		NP_001311121.1
PANK2	NM_024960.6	c.-246+254T>C		intron_variant			NP_079236.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PANK2	ENST00000316562.9	c.58T>C	p.Ser20Pro	missense_variant	1/7	1		ENSP00000313377	A2
PANK2-AS1	ENST00000702266.1	n.16A>G		non_coding_transcript_exon_variant	1/1
PANK2	ENST00000495692.5	c.-538+142T>C		intron_variant		3		ENSP00000476745
PANK2	ENST00000497424.5	c.-246+254T>C		intron_variant		2		ENSP00000417609

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.0000104 AC: 15 AN: 1443398 Hom.: 0 Cov.: 31 AF XY: 0.00000559 AC XY: 4 AN XY: 716132

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: 0.00000997

Gnomad4 OTH exome AF: 0.0000671

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000825 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Pigmentary pallidal degeneration Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

May 08, 2022

This sequence change replaces serine, which is neutral and polar, with proline, which is neutral and non-polar, at codon 20 of the PANK2 protein (p.Ser20Pro). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with PANK2-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The proline amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.059
BayesDel_addAF	Uncertain	0.096	D
BayesDel_noAF	Benign	-0.10
CADD	Benign	8.8
DANN	Uncertain	0.98
DEOGEN2	Benign	0.22	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.67	D
LIST_S2	Benign	0.30	T
M_CAP	Uncertain	0.13	D
MetaRNN	Benign	0.081	T
MetaSVM	Uncertain	-0.084	T
MutationAssessor	Benign	0.0	N
MutationTaster	Benign	1.0	N;N
PrimateAI	Uncertain	0.54	T
PROVEAN	Benign	-0.38	N
REVEL	Benign	0.24
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.0	B
Vest4		0.13
MutPred		0.077		Gain of loop (P = 0.0502);
MVP		0.83
MPC		0.57
ClinPred		0.11	T
GERP RS		-0.52
Varity_R		0.21
gMVP		0.029

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: rs573337848; hg19: chr20-3869805;