chr12-110127405-A-G

Position:

chr12-110127405-A-G

Variant summary

Our verdict is Likely benign. Variant got -3 ACMG points: 2P and 5B. PM2BP4_StrongBS1_Supporting

The NM_014055.4(IFT81):c.25A>G(p.Met9Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000219 in 1,595,218 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 12/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000011 ( 0 hom. )

Consequence

IFT81
NM_014055.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1

Conservation

PhyloP100: 6.48

Variant links:

Genes affected

IFT81 (HGNC:14313): (intraflagellar transport 81) The protein encoded by this gene, together with IFT74, forms a tubulin-binding module of intraflagellar transport complex B. This module is involved in transport of tubulin within the cilium, and the encoded protein is required for ciliogenesis. Mutations in this gene are a cause of short-rib polydactyly syndromes. [provided by RefSeq, Dec 2016]

IFT81 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.022727698).

BS1

Variant frequency is greater than expected in population afr. gnomad4_exome allele frequency = 0.0000111 (16/1443018) while in subpopulation AFR AF= 0.000491 (16/32588). AF 95% confidence interval is 0.000307. There are 0 homozygotes in gnomad4_exome. There are 8 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
IFT81	NM_014055.4 linkuse as main transcript	c.25A>G	p.Met9Val	missense_variant	2/19	ENST00000242591.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
IFT81	ENST00000242591.10 linkuse as main transcript	c.25A>G	p.Met9Val	missense_variant	2/19	1	NM_014055.4	P1	Q8WYA0-1
IFT81	ENST00000552912.5 linkuse as main transcript	c.25A>G	p.Met9Val	missense_variant	2/19	1		P1	Q8WYA0-1
IFT81	ENST00000361948.8 linkuse as main transcript	c.25A>G	p.Met9Val	missense_variant	2/12	1			Q8WYA0-3
IFT81	ENST00000546374.5 linkuse as main transcript	c.25A>G	p.Met9Val	missense_variant	2/10	5

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000434

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000351

AC:

AN:

227754

Hom.:

AF XY:

0.0000244

AC XY:

AN XY:

123178

show subpopulations

Gnomad AFR exome

AF:

0.000559

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000111

AC:

AN:

1443018

Hom.:

Cov.:

AF XY:

0.0000112

AC XY:

AN XY:

717008

show subpopulations

Gnomad4 AFR exome

AF:

0.000491

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.000125

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.000134

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.000434

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000659

Hom.:

Bravo

AF:

0.000181

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000413

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Jul 17, 2023

This sequence change replaces methionine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 9 of the IFT81 protein (p.Met9Val). This variant is present in population databases (rs375743897, gnomAD 0.05%). This variant has not been reported in the literature in individuals affected with IFT81-related conditions. ClinVar contains an entry for this variant (Variation ID: 1039058). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt IFT81 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.035

BayesDel_addAF

Benign

-0.39

BayesDel_noAF

Benign

-0.44

CADD

Benign

DANN

Benign

0.59

Eigen

Benign

-0.71

Eigen_PC

Benign

-0.33

FATHMM_MKL

Benign

0.26

LIST_S2

Benign

0.71

T;.;T;T

M_CAP

Uncertain

0.086

MetaRNN

Benign

0.023

T;T;T;T

MetaSVM

Benign

-0.79

MutationAssessor

Benign

-3.0

N;N;N;.

MutationTaster

Benign

0.80

N;N;N

PrimateAI

Uncertain

0.57

PROVEAN

Benign

2.4

N;N;N;N

REVEL

Uncertain

0.30

Sift

Benign

1.0

T;T;T;T

Sift4G

Benign

1.0

T;T;T;T

Polyphen

0.0

B;B;B;.

Vest4

0.15

MVP

0.41

MPC

0.13

ClinPred

0.069

GERP RS

5.3

Varity_R

0.083

gMVP

0.42

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