17-6423802-A-G

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BA1

The NM_014336.5(AIPL1):c.*1658T>C variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0531 in 152,342 control chromosomes in the GnomAD database, including 285 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: 𝑓 0.053 (285 hom., cov: 33)
  • Exomes 𝑓: 0.10 (0 hom.)
• Consequence: AIPL1 NM_014336.5 3_prime_UTR
• Clinical Significance: Benign/Likely benign criteria provided, single submitter B:3
• Conservation: PhyloP100: 0.105

Genes affected

AIPL1 (HGNC:359): (aryl hydrocarbon receptor interacting protein like 1) Leber congenital amaurosis (LCA) is the most severe inherited retinopathy with the earliest age of onset and accounts for at least 5% of all inherited retinal diseases. Affected individuals are diagnosed at birth or in the first few months of life with nystagmus, severely impaired vision or blindness and an abnormal or flat electroretinogram. The photoreceptor/pineal-expressed gene, AIPL1, encoding aryl-hydrocarbon interacting protein-like 1, is located within the LCA4 candidate region. The encoded protein contains three tetratricopeptide motifs, consistent with chaperone or nuclear transport activity. Mutations in this gene may cause approximately 20% of recessive LCA. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP6: Variant 17-6423802-A-G is Benign according to our data. Variant chr17-6423802-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 324568.Status of the report is criteria_provided_single_submitter, 1 stars.
• BA1: GnomAd4 highest subpopulation (AMR) allele frequency at 95% confidence interval = 0.115 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
AIPL1	NM_014336.5	c.*1658T>C		3_prime_UTR_variant	6/6	ENST00000381129.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AIPL1	ENST00000381129.8	c.*1658T>C		3_prime_UTR_variant	6/6	1	NM_014336.5	P1
AIPL1	ENST00000250087.9	c.*1658T>C		3_prime_UTR_variant	5/5	1
AIPL1	ENST00000381128.2	c.*2685T>C		3_prime_UTR_variant, NMD_transcript_variant	6/6	1
AIPL1	ENST00000570584.5	c.251+10117T>C		intron_variant		3

Frequencies

GnomAD3 genomes AF: 0.0532 AC: 8092 AN: 152204 Hom.: 286 Cov.: 33

Gnomad AFR AF: 0.0143

Gnomad AMI AF: 0.0132

Gnomad AMR AF: 0.120

Gnomad ASJ AF: 0.0441

Gnomad EAS AF: 0.0343

Gnomad SAS AF: 0.0669

Gnomad FIN AF: 0.0510

Gnomad MID AF: 0.0411

Gnomad NFE AF: 0.0634

Gnomad OTH AF: 0.0660

GnomAD4 exome AF: 0.100 AC: 2 AN: 20 Hom.: 0 Cov.: 0 AF XY: 0.00 AC XY: 0 AN XY: 8

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.250

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0531 AC: 8091 AN: 152322 Hom.: 285 Cov.: 33 AF XY: 0.0530 AC XY: 3949 AN XY: 74484

Gnomad4 AFR AF: 0.0142

Gnomad4 AMR AF: 0.120

Gnomad4 ASJ AF: 0.0441

Gnomad4 EAS AF: 0.0346

Gnomad4 SAS AF: 0.0667

Gnomad4 FIN AF: 0.0510

Gnomad4 NFE AF: 0.0634

Gnomad4 OTH AF: 0.0653

Alfa AF: 0.0616 Hom.: 37

Bravo AF: 0.0562

Asia WGS AF: 0.0570 AC: 197 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:3

Revision: criteria provided, single submitter

Submissions by phenotype

Retinitis Pigmentosa, Recessive Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jun 14, 2016

- -

Leber congenital amaurosis 4 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. -

Retinitis pigmentosa Benign:1

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 benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
Cadd	Benign	6.4
Dann	Benign	0.83

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: rs78526307; hg19: chr17-6327122;