chr17-35577102-G-T

Position:

• chr17-35577102-G-T

Variant summary

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

The NM_000286.3(PEX12):​c.616C>A​(p.Gln206Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,461,874 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (1 hom.)
• Consequence: PEX12 NM_000286.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.74

Genes affected

PEX12 (HGNC:8854): (peroxisomal biogenesis factor 12) This gene belongs to the peroxin-12 family. Peroxins (PEXs) are proteins that are essential for the assembly of functional peroxisomes. The peroxisome biogenesis disorders (PBDs) are a group of genetically heterogeneous autosomal recessive, lethal diseases characterized by multiple defects in peroxisome function. The peroxisomal biogenesis disorders are a heterogeneous group with at least 14 complementation groups and with more than 1 phenotype being observed in cases falling into particular complementation groups. Although the clinical features of PBD patients vary, cells from all PBD patients exhibit a defect in the import of one or more classes of peroxisomal matrix proteins into the organelle. Defects in this gene are a cause of Zellweger syndrome (ZWS). [provided by RefSeq, Oct 2008]

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=0.13860899).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PEX12	NM_000286.3	c.616C>A	p.Gln206Lys	missense_variant	2/3	ENST00000225873.9	NP_000277.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PEX12	ENST00000225873.9	c.616C>A	p.Gln206Lys	missense_variant	2/3	1	NM_000286.3	ENSP00000225873.3
PEX12	ENST00000586663.2	n.616C>A		non_coding_transcript_exon_variant	2/3	1		ENSP00000466894.2
PEX12	ENST00000585380.1	c.616C>A	p.Gln206Lys	missense_variant	3/3	4		ENSP00000466280.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000795 AC: 2 AN: 251486 Hom.: 1 AF XY: 0.0000147 AC XY: 2 AN XY: 135916

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: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461874 Hom.: 1 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727240

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000468 Hom.: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Peroxisome biogenesis disorder 3A (Zellweger) Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 15, 2021

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 missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with PEX12-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glutamine with lysine at codon 206 of the PEX12 protein (p.Gln206Lys). The glutamine residue is weakly conserved and there is a small physicochemical difference between glutamine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.081
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	17
DANN	Benign	0.89
DEOGEN2	Benign	0.069	T;T;T
Eigen	Benign	-0.69
Eigen_PC	Benign	-0.50
FATHMM_MKL	Benign	0.74	D
LIST_S2	Benign	0.79	.;T;T
M_CAP	Benign	0.026	D
MetaRNN	Benign	0.14	T;T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	1.0	L;L;.
PrimateAI	Benign	0.29	T
PROVEAN	Benign	-0.66	N;.;.
REVEL	Benign	0.21
Sift	Benign	0.041	D;.;.
Sift4G	Benign	0.23	T;T;T
Polyphen		0.0040	B;B;.
Vest4		0.14
MutPred		0.57		Loss of sheet (P = 0.0063);Loss of sheet (P = 0.0063);Loss of sheet (P = 0.0063);
MVP		0.69
MPC		0.23
ClinPred		0.029	T
GERP RS		2.1
Varity_R		0.17
gMVP		0.47

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: rs786205502; hg19: chr17-33904121;