chr17-8096235-C-T

Position:

• chr17-8096235-C-T

Variant summary

Our verdict is Benign. Variant got -8 ACMG points: 2P and 10B. PM2 BP4_Strong BP6_Moderate BS1

The NM_021628.3(ALOXE3):​c.*392G>A variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00144 in 207,252 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 Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.0019 (0 hom., cov: 32)
  • Exomes 𝑓: 0.00016 (0 hom.)
• Consequence: ALOXE3 NM_021628.3 3_prime_UTR
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.172

Genes affected

ALOXE3 (HGNC:13743): (arachidonate lipoxygenase 3) This gene is a member of the lipoxygenase family, which are catabolized by arachidonic acid-derived compounds. The encoded enzyme is a hydroperoxide isomerase that synthesizes a unique type of epoxy alcohol (8R-hydroxy-11R,12R-epoxyeicosa-5Z,9E,14Z-trienoic acid) from 12R-hydroperoxyeicosatetraenoic acid (12R-HPETE). This epoxy alcohol can activate the the nuclear receptor peroxisome proliferator-activated receptor alpha (PPARalpha), which is implicated in epidermal differentiation. Loss of function of the enzyme encoded by this gene results in ichthyosis, implicating the function of this gene in the differentiation of human skin. This gene is part of a cluster of lipoxygenase genes on 17p13.1. Mutations in this gene result in nonbullous congenital ichthyosiform erythroderma (NCIE). Multiple transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Sep 2009]

ACMG classification

Verdict is Benign. Variant got -8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 17-8096235-C-T is Benign according to our data. Variant chr17-8096235-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 325947.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0019 (289/152144) while in subpopulation AFR AF= 0.0066 (274/41494). AF 95% confidence interval is 0.00596. There are 0 homozygotes in gnomad4. There are 134 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ALOXE3	NM_021628.3	c.*392G>A		3_prime_UTR_variant	16/16	ENST00000448843.7
ALOXE3	NM_001165960.1	c.*392G>A		3_prime_UTR_variant	16/16
ALOXE3	NM_001369446.1	c.*392G>A		3_prime_UTR_variant	15/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ALOXE3	ENST00000448843.7	c.*392G>A		3_prime_UTR_variant	16/16	1	NM_021628.3	P1
ALOXE3	ENST00000380149.6	c.*392G>A		3_prime_UTR_variant	15/15	1		P1
ALOXE3	ENST00000583808.1			downstream_gene_variant		4

Frequencies

GnomAD3 genomes AF: 0.00191 AC: 291 AN: 152026 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.00667

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000656

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: 0.0000588

Gnomad OTH AF: 0.000479

GnomAD4 exome AF: 0.000163 AC: 9 AN: 55108 Hom.: 0 Cov.: 0 AF XY: 0.000140 AC XY: 4 AN XY: 28596

Gnomad4 AFR exome AF: 0.00480

Gnomad4 AMR exome AF: 0.000272

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00190 AC: 289 AN: 152144 Hom.: 0 Cov.: 32 AF XY: 0.00180 AC XY: 134 AN XY: 74370

Gnomad4 AFR AF: 0.00660

Gnomad4 AMR AF: 0.000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000588

Gnomad4 OTH AF: 0.000474

Alfa AF: 0.000417 Hom.: 0

Bravo AF: 0.00217

Asia WGS AF: 0.000289 AC: 1 AN: 3478

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Autosomal recessive congenital ichthyosis 3 Benign:1

Likely benign, 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 and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	1.6
DANN	Benign	0.32

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: rs188419202; hg19: chr17-7999553;