rs753478409

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_020800.3(IFT80):c.938C>T(p.Thr313Met) variant causes a missense change. The variant allele was found at a frequency of 0.0000143 in 1,612,556 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T313A) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

IFT80
NM_020800.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 5.12

Publications

1 publications found

Variant links:

Genes affected

IFT80 (HGNC:29262): (intraflagellar transport 80) The protein encoded by this gene is part of the intraflagellar transport complex B and is necessary for the function of motile and sensory cilia. Defects in this gene are a cause of asphyxiating thoracic dystrophy 2 (ATD2). Three transcript variants encoding two different isoforms have been found for this gene.[provided by RefSeq, Jun 2010]

IFT80 links:

TRIM59-IFT80 (HGNC:56756): (TRIM59-IFT80 readthrough (NMD candidate)) This locus represents naturally occurring readthrough transcription between the neighboring TRIM59 (tripartite motif containing 59) and IFT80 (intraflagellar transport 80) genes on chromosome 3. The readthrough transcript is unlikely to produce a protein product. [provided by RefSeq, Jun 2017]

TRIM59-IFT80 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.34543633).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFT80	NM_020800.3 link	c.938C>T	p.Thr313Met	missense_variant	Exon 9 of 20	ENST00000326448.12	NP_065851.1	Q9P2H3-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFT80	ENST00000326448.12 link	c.938C>T	p.Thr313Met	missense_variant	Exon 9 of 20	1	NM_020800.3	ENSP00000312778.7		Q9P2H3-1
TRIM59-IFT80	ENST00000483754.1 link	n.1451C>T		non_coding_transcript_exon_variant	Exon 7 of 19	2		ENSP00000456272.1		H3BRJ5

Frequencies

GnomAD3 genomes

AF:

0.0000198

AC:

AN:

151838

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000120

AC:

AN:

250988

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000137

AC:

AN:

1460718

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

726666

show subpopulations

African (AFR)

AF:

0.0000598

AC:

AN:

33428

American (AMR)

AF:

0.00

AC:

AN:

44660

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26076

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39672

South Asian (SAS)

AF:

0.00

AC:

AN:

86218

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53380

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000135

AC:

AN:

1111196

Other (OTH)

AF:

0.0000332

AC:

AN:

60326

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.455

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

AF:

0.0000198

AC:

AN:

151838

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74152

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41376

American (AMR)

AF:

0.00

AC:

AN:

15178

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3464

East Asian (EAS)

AF:

0.000193

AC:

AN:

5192

South Asian (SAS)

AF:

0.00

AC:

AN:

4820

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10578

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

67912

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.558

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:

0.0000712

Hom.:

Bravo

AF:

0.0000113

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

May 13, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.938C>T (p.T313M) alteration is located in exon 9 (coding exon 8) of the IFT80 gene. This alteration results from a C to T substitution at nucleotide position 938, causing the threonine (T) at amino acid position 313 to be replaced by a methionine (M). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Jeune thoracic dystrophy

Uncertain:1

Jan 10, 2019

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. This variant has not been reported in the literature in individuals with IFT80-related conditions. ClinVar contains an entry for this variant (Variation ID: 216710). This variant is present in population databases (rs753478409, ExAC 0.01%). This sequence change replaces threonine with methionine at codon 313 of the IFT80 protein (p.Thr313Met). The threonine residue is highly conserved and there is a moderate physicochemical difference between threonine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.077

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.18

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.50

T;.;.

Eigen

Uncertain

0.22

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.90

D;.;D

M_CAP

Benign

0.063

MetaRNN

Benign

0.35

T;T;T

MetaSVM

Benign

-0.39

MutationAssessor

Benign

2.0

M;.;.

PhyloP100

5.1

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-2.7

D;N;N

REVEL

Uncertain

0.32

Sift

Benign

0.081

T;T;T

Sift4G

Benign

0.089

T;T;T

Polyphen

0.71

P;.;.

Vest4

0.34

MutPred

0.43

Loss of methylation at K314 (P = 0.035);.;.;

MVP

0.89

MPC

0.56

ClinPred

0.89

GERP RS

3.8

Varity_R

0.12

gMVP

0.42

Mutation Taster

=67/33

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

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over