Genetic Variant IFT22:p.Arg158Pro (chr7-101315219-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_022777.4(IFT22):c.473G>C(p.Arg158Pro) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,862 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R158W) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

IFT22
NM_022777.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.86

Publications

0 publications found

Variant links:

Genes affected

IFT22 (HGNC:21895): (intraflagellar transport 22) Predicted to enable GTPase activity. Predicted to be involved in intracellular protein transport. Predicted to be located in ciliary tip. Predicted to be part of intraciliary transport particle B. Predicted to be active in endomembrane system. [provided by Alliance of Genome Resources, Apr 2022]

IFT22 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022777.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
IFT22	NM_022777.4	MANE Select	c.473G>C	p.Arg158Pro	missense	Exon 5 of 5	NP_073614.1	Q9H7X7-1
IFT22	NM_001130820.3		c.383G>C	p.Arg128Pro	missense	Exon 4 of 4	NP_001124292.1	Q9H7X7-2
IFT22	NM_001130821.3		c.242G>C	p.Arg81Pro	missense	Exon 5 of 5	NP_001124293.1	Q9H7X7-3

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
IFT22	ENST00000315322.10	TSL:1 MANE Select	c.473G>C	p.Arg158Pro	missense	Exon 5 of 5	ENSP00000320359.4	Q9H7X7-1
IFT22	ENST00000437644.2	TSL:1	c.383G>C	p.Arg128Pro	missense	Exon 4 of 4	ENSP00000390770.2	Q9H7X7-2
IFT22	ENST00000498704.6	TSL:2	c.242G>C	p.Arg81Pro	missense	Exon 4 of 4	ENSP00000429648.1	Q9H7X7-3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461862

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727232

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53418

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111984

Other (OTH)

AF:

0.0000166

AC:

AN:

60394

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Pathogenic

0.26

BayesDel_noAF

Pathogenic

0.14

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.24

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.49

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.91

M_CAP

Benign

0.031

MetaRNN

Uncertain

0.66

MetaSVM

Benign

-0.55

MutationAssessor

Pathogenic

2.9

PhyloP100

5.9

PrimateAI

Uncertain

0.57

PROVEAN

Pathogenic

-5.3

REVEL

Uncertain

0.34

Sift

Uncertain

0.0020

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.80

MutPred

0.56

Gain of methylation at K163 (P = 0.0625)

MVP

0.63

MPC

1.1

ClinPred

1.0

GERP RS

4.0

Varity_R

0.90

gMVP

0.83

Mutation Taster

=48/52

disease causing

(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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over