Genetic Variant NM_024926.4:c.376C>G (chr7-139142282-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_024926.4(IFT56):c.376C>G(p.Leu126Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000479 in 1,461,830 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

IFT56
NM_024926.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 3.69

Publications

0 publications found

Variant links:

Genes affected

IFT56 (HGNC:21882): (intraflagellar transport 56) Predicted to enable intraciliary transport particle B binding activity. Predicted to be involved in cilium organization; protein localization to cilium; and smoothened signaling pathway. Predicted to act upstream of or within manchette assembly. Predicted to be located in cilium. Predicted to be part of intraciliary transport particle B. Predicted to be active in ciliary basal body and ciliary base. [provided by Alliance of Genome Resources, Apr 2022]

IFT56 Gene-Disease associations (from GenCC):

biliary, renal, neurologic, and skeletal syndrome
Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)

IFT56 links:

Genome browser will be placed here

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;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
IFT56	NM_024926.4 link	c.376C>G	p.Leu126Val	missense_variant	Exon 5 of 18	ENST00000464848.5	NP_079202.2	A0AVF1-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
IFT56	ENST00000464848.5 link	c.376C>G	p.Leu126Val	missense_variant	Exon 5 of 18	1	NM_024926.4	ENSP00000419279.1		A0AVF1-1
IFT56	ENST00000478836.6 link	c.376C>G	p.Leu126Val	missense_variant	Exon 5 of 16	2		ENSP00000419178.2		B7Z6R6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251368

AF XY:

0.00000736

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000479

AC:

AN:

1461830

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727212

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33478

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26132

East Asian (EAS)

AF:

0.00

AC:

AN:

39692

South Asian (SAS)

AF:

0.00

AC:

AN:

86254

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.00000450

AC:

AN:

1111994

Other (OTH)

AF:

0.0000331

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.489

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ExAC

AF:

0.00000824

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

May 04, 2025

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.376C>G (p.L126V) alteration is located in exon 5 (coding exon 5) of the TTC26 gene. This alteration results from a C to G substitution at nucleotide position 376, causing the leucine (L) at amino acid position 126 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Uncertain

0.13

BayesDel_noAF

Uncertain

-0.050

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.091

.;T;T;T;T;.

Eigen

Uncertain

0.42

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.88

D;D;T;D;D;D

M_CAP

Uncertain

0.11

MetaRNN

Uncertain

0.73

D;D;D;D;D;D

MetaSVM

Uncertain

0.0053

PhyloP100

3.7

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-2.0

N;N;N;N;N;N

REVEL

Uncertain

0.38

Sift

Benign

0.042

D;D;T;D;D;D

Sift4G

Uncertain

0.053

T;T;T;T;T;T

Polyphen

0.90, 1.0, 0.99

.;P;D;D;D;.

Vest4

0.80

MutPred

0.46

Loss of stability (P = 0.0472);Loss of stability (P = 0.0472);Loss of stability (P = 0.0472);Loss of stability (P = 0.0472);Loss of stability (P = 0.0472);.;

MVP

0.83

MPC

0.29

ClinPred

0.58

GERP RS

4.4

Varity_R

0.10

gMVP

0.47

Mutation Taster

=25/75

disease causing

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.020

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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NM_024926.4:c.376C>G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over