2-27444503-A-G

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong

The NM_015662.3(IFT172):c.5179T>C(p.Cys1727Arg) variant causes a missense change. The variant allele was found at a frequency of 0.0000384 in 1,613,514 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000039 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000038 ( 0 hom. )

Consequence

IFT172
NM_015662.3 missense

Scores

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:6

Conservation

PhyloP100: 6.86

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 links:

KRTCAP3 (HGNC:28943): (keratinocyte associated protein 3) Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

KRTCAP3 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.831

PP5

Variant 2-27444503-A-G is Pathogenic according to our data. Variant chr2-27444503-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 97022.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-27444503-A-G is described in Lovd as [Likely_pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFT172	NM_015662.3 link	c.5179T>C	p.Cys1727Arg	missense_variant	Exon 48 of 48	ENST00000260570.8	NP_056477.1	Q9UG01-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFT172	ENST00000260570.8 link	c.5179T>C	p.Cys1727Arg	missense_variant	Exon 48 of 48	1	NM_015662.3	ENSP00000260570.3		Q9UG01-1

Frequencies

GnomAD3 genomes

AF:

0.0000394

AC:

AN:

152158

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:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000120

AC:

AN:

250598

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135392

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000265

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000383

AC:

AN:

1461356

Hom.:

Cov.:

AF XY:

0.0000275

AC XY:

AN XY:

726956

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000477

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000394

AC:

AN:

152158

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74340

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000446

Hom.:

Bravo

AF:

0.0000453

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Short-rib thoracic dysplasia 10 with or without polydactyly

Pathogenic:2

Jul 27, 2018

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A heterozygous missense variant, NM_015662.1(IFT172):c.5179T>C, has been identified in exon 48 of 48 of the IFT172 gene. The variant is predicted to result in a major amino acid change from cysteine to arginine at position 1727 of the protein (NP_056477.1(IFT172):p.(Cys1727Arg)). The cysteine at this position has moderate conservation (100 vertebrates, UCSC), but is not located within a well established functional domain. In silico predictions for this variant are consistently pathogenic (Polyphen, SIFT, CADD, Mutation Taster). This variant is present in the gnomAD database at a frequency of 0.0014% (4 heterozygotes and 0 homozygotes). It has been previously described as pathogenic in multiple cases and segregated with the disease in one family (Halbritter J. et al. (2013), McIerney A. et al. (2014)). Additionally, examination of cultured patient fibroblast showed significant decrease in adenylyl cyclase III (Halbritter J. et al. 2013). Based on the information available at the time of curation, this variant has been classified as PATHOGENIC. -

Nov 07, 2013

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

- -

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

Pathogenic:1

Aug 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces cysteine, which is neutral and slightly polar, with arginine, which is basic and polar, at codon 1727 of the IFT172 protein (p.Cys1727Arg). This variant is present in population databases (rs149614625, gnomAD 0.003%). This missense change has been observed in individual(s) with skeletal ciliopathies and Mainzer-Saldino syndrome (PMID: 24140113, 25664603). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 97022). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is expected to disrupt IFT172 protein function with a positive predictive value of 80%. For these reasons, this variant has been classified as Pathogenic. -

IFT172-related disorder

Pathogenic:1

Jun 27, 2024

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

The IFT172 c.5179T>C variant is predicted to result in the amino acid substitution p.Cys1727Arg. This variant was reported in multiple patients with asphyxiating thoracic dystrophy and Mainzer-Saldino syndrome (Halbritter et al. 2013. PubMed ID: 24140113; Lucas-Herald et al. 2015. PubMed ID: 25664603). This variant is reported in 0.0031% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -

Short-rib thoracic dysplasia 10 with or without polydactyly;C4225342:Retinitis pigmentosa 71;C4310707:Bardet-Biedl syndrome 20

Pathogenic:1

May 25, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Retinitis pigmentosa

Pathogenic:1

Apr 01, 2021

Broad Center for Mendelian Genomics, Broad Institute of MIT and Harvard

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

The p.Cys1727Arg variant in IFT172 was identified in an individual with Retinitis pigmentosa, via a collaborative study between the Broad Institute's Center for Mendelian Genomics and the Pierce lab (https://oculargenomics.meei.harvard.edu/labs/pierce-lab/lab-members/). Through a review of available evidence we were able to apply the following criteria: PM2, PP3, PS3, PP1, PM3. Based on this evidence we have classified this variant as Pathogenic. If you have any questions about the classification please reach out to the Pierce Lab. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.96

BayesDel_addAF

Pathogenic

0.23

BayesDel_noAF

Pathogenic

0.15

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.59

Eigen

Uncertain

0.40

Eigen_PC

Uncertain

0.50

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.89

M_CAP

Benign

0.074

MetaRNN

Pathogenic

0.83

MetaSVM

Benign

-0.91

MutationAssessor

Uncertain

2.4

PrimateAI

Pathogenic

0.85

PROVEAN

Pathogenic

-4.7

REVEL

Uncertain

0.60

Sift

Uncertain

0.012

Sift4G

Uncertain

0.018

Polyphen

0.94

Vest4

0.91

MVP

0.41

MPC

0.76

ClinPred

0.90

GERP RS

5.6

Varity_R

0.85

gMVP

0.87

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over