Genetic Variant ALOX12B:c.*118dupA (chr17-8072652-G-GT) – ACMG Classification: Likely_benign (-5 pts)

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BS1_SupportingBS2

The NM_001139.3(ALOX12B):c.*118dupA variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00164 in 1,438,474 control chromosomes in the GnomAD database, including 10 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0019 ( 4 hom., cov: 32)

Exomes 𝑓: 0.0016 ( 6 hom. )

Consequence

ALOX12B
NM_001139.3 3_prime_UTR

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.264

Publications

0 publications found

Variant links:

Genes affected

ALOX12B (HGNC:430): (arachidonate 12-lipoxygenase, 12R type) This gene encodes an enzyme involved in the conversion of arachidonic acid to 12R-hydroxyeicosatetraenoic acid. Mutations in this gene are associated with nonbullous congenital ichthyosiform erythroderma. [provided by RefSeq, Sep 2015]

ALOX12B links:

ALOXE3P1 (HGNC:44238): (arachidonate lipoxygenase 3 pseudogene 1)

ALOXE3P1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -5 ACMG points.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.00194 (295/152322) while in subpopulation SAS AF = 0.00249 (12/4826). AF 95% confidence interval is 0.00156. There are 4 homozygotes in GnomAd4. There are 174 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High Homozygotes in GnomAd4 at 4 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001139.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ALOX12B	NM_001139.3	MANE Select	c.*118dupA		3_prime_UTR	Exon 15 of 15	NP_001130.1	O75342

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
ALOX12B	ENST00000647874.1	MANE Select	c.*118dupA	3_prime_UTR	Exon 15 of 15	ENSP00000497784.1	O75342
ALOX12B	ENST00000649809.1		c.*118dupA	downstream_gene	N/A	ENSP00000496845.1	A0A3B3IRK2
ALOXE3P1	ENST00000611383.1	TSL:6	n.119_120insT	downstream_gene	N/A

Frequencies

GnomAD3 genomes

AF:

0.00194

AC:

295

AN:

152204

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000289

Gnomad AMI

AF:

0.00110

Gnomad AMR

AF:

0.000981

Gnomad ASJ

AF:

0.00461

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00248

Gnomad FIN

AF:

0.0107

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00182

Gnomad OTH

AF:

0.000478

GnomAD4 exome

AF:

0.00161

AC:

2065

AN:

1286152

Hom.:

Cov.:

AF XY:

0.00163

AC XY:

1052

AN XY:

645888

show subpopulations

African (AFR)

AF:

0.000244

AC:

AN:

28676

American (AMR)

AF:

0.00114

AC:

AN:

39494

Ashkenazi Jewish (ASJ)

AF:

0.00297

AC:

AN:

24268

East Asian (EAS)

AF:

0.0000259

AC:

AN:

38676

South Asian (SAS)

AF:

0.00165

AC:

131

AN:

79472

European-Finnish (FIN)

AF:

0.0110

AC:

560

AN:

51140

Middle Eastern (MID)

AF:

0.00379

AC:

AN:

4220

European-Non Finnish (NFE)

AF:

0.00117

AC:

1132

AN:

965888

Other (OTH)

AF:

0.00186

AC:

101

AN:

54318

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.500

Heterozygous variant carriers

111

222

333

444

555

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

128

160

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00194

AC:

295

AN:

152322

Hom.:

Cov.:

AF XY:

0.00234

AC XY:

174

AN XY:

74486

show subpopulations

African (AFR)

AF:

0.000289

AC:

AN:

41576

American (AMR)

AF:

0.000980

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00461

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00249

AC:

AN:

4826

European-Finnish (FIN)

AF:

0.0107

AC:

114

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00182

AC:

124

AN:

68022

Other (OTH)

AF:

0.000473

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00113

Hom.:

Bravo

AF:

0.00116

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

Congenital ichthyosiform erythroderma (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

0.26

Mutation Taster

=100/0

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over