rs142409945

Variant names:

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_015662.3(IFT172):c.2770T>G(p.Ser924Ala) variant causes a missense change. The variant allele was found at a frequency of 0.000817 in 1,614,080 control chromosomes in the GnomAD database, including 3 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S924P) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00051 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00085 ( 3 hom. )

Consequence

IFT172
NM_015662.3 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 3.81

Publications

4 publications found

Variant links:

Genes affected

IFT172 (HGNC:30391): (intraflagellar transport 172) This gene encodes a subunit of the intraflagellar transport subcomplex IFT-B. Subcomplexes IFT-A and IFT-B are necessary for ciliary assembly and maintenance. Mutations in this gene have been associated with skeletal ciliopathies, with or without polydactyly, such as such short-rib thoracic dysplasias 1, 9 or 10. [provided by RefSeq, Mar 2014]

IFT172 Gene-Disease associations (from GenCC):

short-rib thoracic dysplasia 10 with or without polydactyly
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), G2P, Ambry Genetics
Bardet-Biedl syndrome 20
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
retinitis pigmentosa 71
Inheritance: AR Classification: STRONG, MODERATE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
retinitis pigmentosa
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
Bardet-Biedl syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
Jeune syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
short-rib thoracic dysplasia 9 with or without polydactyly
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

IFT172 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.028952807).

BP6

Variant 2-27459395-A-C is Benign according to our data. Variant chr2-27459395-A-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 476044.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000506 (77/152204) while in subpopulation SAS AF = 0.00166 (8/4824). AF 95% confidence interval is 0.000825. There are 0 homozygotes in GnomAd4. There are 35 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 3 AR,AD gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015662.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IFT172	NM_015662.3	MANE Select	c.2770T>G	p.Ser924Ala	missense	Exon 25 of 48	NP_056477.1
	IFT172	NM_001410739.1		c.2704T>G	p.Ser902Ala	missense	Exon 25 of 48	NP_001397668.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
IFT172	ENST00000260570.8	TSL:1 MANE Select	c.2770T>G	p.Ser924Ala	missense	Exon 25 of 48	ENSP00000260570.3
IFT172	ENST00000675690.1		c.2704T>G	p.Ser902Ala	missense	Exon 25 of 48	ENSP00000502283.1
IFT172	ENST00000507184.5	TSL:5	n.2902T>G		non_coding_transcript_exon	Exon 26 of 48

Frequencies

GnomAD3 genomes

AF:

0.000506

AC:

AN:

152086

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000145

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000328

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00166

Gnomad FIN

AF:

0.0000942

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000823

Gnomad OTH

AF:

0.000478

GnomAD2 exomes

AF:

0.000625

AC:

157

AN:

251264

AF XY:

0.000670

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.000347

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.000907

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000850

AC:

1242

AN:

1461876

Hom.:

Cov.:

AF XY:

0.000898

AC XY:

653

AN XY:

727242

show subpopulations

African (AFR)

AF:

0.0000597

AC:

AN:

33480

American (AMR)

AF:

0.000380

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000383

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00155

AC:

134

AN:

86256

European-Finnish (FIN)

AF:

0.0000936

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.000347

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000941

AC:

1046

AN:

1112002

Other (OTH)

AF:

0.000580

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

133

199

266

332

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

114

152

190

<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:

0.000506

AC:

AN:

152204

Hom.:

Cov.:

AF XY:

0.000470

AC XY:

AN XY:

74422

show subpopulations

African (AFR)

AF:

0.000145

AC:

AN:

41512

American (AMR)

AF:

0.000327

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5178

South Asian (SAS)

AF:

0.00166

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.0000942

AC:

AN:

10612

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000823

AC:

AN:

68010

Other (OTH)

AF:

0.000473

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.509

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:

0.000869

Hom.:

Bravo

AF:

0.000442

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.00182

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000814

AC:

ExAC

AF:

0.000626

AC:

EpiCase

AF:

0.000981

EpiControl

AF:

0.000830

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:2

Mar 14, 2025

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis indicates that this missense variant does not alter protein structure/function; This variant is associated with the following publications: (PMID: 32483926, 35836572)

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Intellectual disability

Uncertain:1

Feb 11, 2020

Cambridge Genomics Laboratory, East Genomic Laboratory Hub, NHS Genomic Medicine Service

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Retinitis pigmentosa 71

Uncertain:1

Feb 14, 2018

Baylor Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868].

Short-rib thoracic dysplasia 10 with or without polydactyly;C4225342:Retinitis pigmentosa 71

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

IFT172-related disorder

Benign:1

Jul 22, 2022

PreventionGenetics, part of Exact Sciences

Significance:Likely benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications).

Inborn genetic diseases

Benign:1

Mar 05, 2024

Ambry Genetics

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.067

BayesDel_addAF

Benign

-0.53

BayesDel_noAF

Benign

-0.55

CADD

Benign

(source)

DANN

Benign

0.95

DEOGEN2

Benign

0.24

Eigen

Benign

-0.098

Eigen_PC

Benign

0.10

FATHMM_MKL

Uncertain

0.94

LIST_S2

Benign

0.64

M_CAP

Benign

0.012

MetaRNN

Benign

0.029

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.1

PhyloP100

3.8

PrimateAI

Uncertain

0.51

PROVEAN

Benign

-1.9

REVEL

Benign

0.055

Sift

Benign

0.22

Sift4G

Benign

0.56

Polyphen

0.0040

Vest4

0.23

MVP

0.18

MPC

0.15

ClinPred

0.027

GERP RS

5.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.058

gMVP

0.18

Mutation Taster

=93/7

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

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over