rs755246809

Variant names:

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 9P and 1B. PVS1PP3BS1_Supporting

The ENST00000265602.11(AHI1):c.2988delA(p.Val997fs) variant causes a frameshift, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000213 in 1,608,248 control chromosomes in the GnomAD database, including 1 homozygotes. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000085 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00023 ( 1 hom. )

Consequence

AHI1
ENST00000265602.11 frameshift, splice_region

Scores

Not classified

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:5U:4B:1

Conservation

PhyloP100: -0.0240

Publications

4 publications found

Variant links:

Genes affected

AHI1 (HGNC:21575): (Abelson helper integration site 1) This gene is apparently required for both cerebellar and cortical development in humans. This gene mutations cause specific forms of Joubert syndrome-related disorders. Joubert syndrome (JS) is a recessively inherited developmental brain disorder with several identified causative chromosomal loci. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Oct 2008]

AHI1 Gene-Disease associations (from GenCC):

Joubert syndrome 3
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P, ClinGen, Laboratory for Molecular Medicine, Ambry Genetics
Joubert syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Joubert syndrome with ocular defect
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
retinitis pigmentosa
Inheritance: AR, AD Classification: SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Orphanet

AHI1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_pathogenic. The variant received 8 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PP3

Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.0000854 (13/152236) while in subpopulation SAS AF = 0.00228 (11/4820). AF 95% confidence interval is 0.00128. There are 0 homozygotes in GnomAd4. There are 12 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

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000265602.11. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
AHI1	NM_001134831.2	MANE Select	c.2988delA	p.Val997fs	frameshift splice_region	Exon 22 of 29	NP_001128303.1
AHI1	NM_001134830.2		c.2988delA	p.Val997fs	frameshift splice_region	Exon 20 of 27	NP_001128302.1
AHI1	NM_001350503.2		c.2988delA	p.Val997fs	frameshift splice_region	Exon 22 of 29	NP_001337432.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
AHI1	ENST00000265602.11	TSL:1 MANE Select	c.2988delA	p.Val997fs	frameshift splice_region	Exon 22 of 29	ENSP00000265602.6
AHI1	ENST00000367800.8	TSL:1	c.2988delA	p.Val997fs	frameshift splice_region	Exon 20 of 27	ENSP00000356774.4
AHI1	ENST00000457866.6	TSL:1	c.2988delA	p.Val997fs	frameshift splice_region	Exon 21 of 28	ENSP00000388650.2

Frequencies

GnomAD3 genomes

AF:

0.0000855

AC:

AN:

152118

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00228

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000592

AC:

147

AN:

248166

AF XY:

0.000728

show subpopulations

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.000226

AC:

329

AN:

1456012

Hom.:

Cov.:

AF XY:

0.000306

AC XY:

222

AN XY:

724630

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33334

American (AMR)

AF:

0.00

AC:

AN:

44694

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26070

East Asian (EAS)

AF:

0.00

AC:

AN:

39540

South Asian (SAS)

AF:

0.00361

AC:

311

AN:

86106

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53126

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5728

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1107250

Other (OTH)

AF:

0.000299

AC:

AN:

60164

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.442

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome 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

GnomAD4 genome

AF:

0.0000854

AC:

AN:

152236

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74426

show subpopulations

African (AFR)

AF:

0.0000241

AC:

AN:

41536

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5184

South Asian (SAS)

AF:

0.00228

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10606

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68016

Other (OTH)

AF:

0.000473

AC:

AN:

2112

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.490

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

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:

0.0000480

Hom.:

Bravo

AF:

0.0000151

Asia WGS

AF:

0.00144

AC:

AN:

3476

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Joubert syndrome 3 (3)

not specified (3)

Joubert syndrome (1)

not provided (1)

Retinal dystrophy (1)

Retinitis pigmentosa (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

PhyloP100

-0.024

Mutation Taster

=6/194

disease causing (ClinVar)

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.80

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.55

Position offset: 2

DS_DL_spliceai

0.80

Position offset: 1

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

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over