16-1520177-C-G

Variant names:

• chr16-1520177-C-G
• rs779007169
• NM_014714.4:c.3827G>C

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM5

The NM_014714.4(IFT140):​c.3827G>C​(p.Gly1276Ala) variant causes a missense change. The variant allele was found at a frequency of 0.00000547 in 1,461,876 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G1276E) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000055 (0 hom.)
• Consequence: IFT140 NM_014714.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.11
• Publications: 2 publications found

Genes affected

IFT140 (HGNC:29077): (intraflagellar transport 140) This gene encodes one of the subunits of the intraflagellar transport (IFT) complex A. Intraflagellar transport is involved in the genesis, resorption and signaling of primary cilia. The primary cilium is a microtubule-based sensory organelle at the surface of most quiescent mammalian cells, that receives signals from its environment, such as the flow of fluid, light or odors, and transduces those signals to the nucleus. Loss of the corresponding protein in mouse results in renal cystic disease. [provided by RefSeq, Jun 2012]

IFT140 Gene-Disease associations (from GenCC):

• autosomal dominant polycystic kidney disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics, ClinGen
• IFT140-related recessive ciliopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen, Illumina
• short-rib thoracic dysplasia 9 with or without polydactyly

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
• retinitis pigmentosa 80

  Inheritance: AR Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
• Leber congenital amaurosis

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• Jeune syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

• PM5: Other missense variant is known to change same aminoacid residue: Variant chr16-1520177-C-T is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 191356.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_014714.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IFT140	NM_014714.4	MANE Select	c.3827G>C	p.Gly1276Ala	missense	Exon 28 of 31	NP_055529.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	IFT140	ENST00000426508.7	TSL:5 MANE Select	c.3827G>C	p.Gly1276Ala	missense	Exon 28 of 31	ENSP00000406012.2	Q96RY7-1
	IFT140	ENST00000361339.9	TSL:1	c.1409G>C	p.Gly470Ala	missense	Exon 10 of 13	ENSP00000354895.5	Q96RY7-2
	IFT140	ENST00000889170.1		c.3827G>C	p.Gly1276Ala	missense	Exon 27 of 30	ENSP00000559229.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000547 AC: 8 AN: 1461876 Hom.: 0 Cov.: 32 AF XY: 0.00000963 AC XY: 7 AN XY: 727240

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000719 AC: 8 AN: 1112010

Other (OTH) AF: 0.00 AC: 0 AN: 60394

GnomAD4 genome Cov.: 33

ExAC AF: 0.00000824 AC: 1

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.32
BayesDel_addAF	Pathogenic	0.22	D
BayesDel_noAF	Uncertain	0.080
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	T
Eigen	Uncertain	0.39
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.95	D
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.36	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.8	L
PhyloP100		6.1
PrimateAI	Uncertain	0.75	T
PROVEAN	Uncertain	-3.6	D
REVEL	Uncertain	0.35
Sift	Benign	0.45	T
Sift4G	Benign	0.36	T
Polyphen		0.99	D
Vest4		0.60
MutPred		0.60		Gain of helix (P = 0.132)
MVP		0.41
MPC		0.28
ClinPred		0.98	D
GERP RS		5.1
PromoterAI		-0.028	Neutral
Varity_R		0.77
gMVP		0.68
Mutation Taster		=31/69	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.24		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.24		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs779007169; hg19: chr16-1570178;