2-177617867-G-A

Position:

• chr2-177617867-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_152275.4(IFT70A):​c.835C>T​(p.Pro279Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,888 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: IFT70A NM_152275.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.85

Genes affected

IFT70A (HGNC:25853): (intraflagellar transport 70A) Predicted to enable intraciliary transport particle B binding activity. Predicted to be involved in intraciliary transport. Predicted to be located in centrosome and cilium. Predicted to be part of intraciliary transport particle B. Predicted to be active in axonemal microtubule and ciliary basal body. [provided by Alliance of Genome Resources, Apr 2022]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
IFT70A	NM_152275.4	c.835C>T	p.Pro279Ser	missense_variant	1/1	ENST00000355689.6	NP_689488.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
IFT70A	ENST00000355689.6	c.835C>T	p.Pro279Ser	missense_variant	1/1		NM_152275.4	ENSP00000347915	P1
	ENST00000357045.4	n.305+347G>A		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461888 Hom.: 0 Cov.: 35 AF XY: 0.00000275 AC XY: 2 AN XY: 727242

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 28, 2023

The c.835C>T (p.P279S) alteration is located in exon 1 (coding exon 1) of the TTC30A gene. This alteration results from a C to T substitution at nucleotide position 835, causing the proline (P) at amino acid position 279 to be replaced by a serine (S). 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	Uncertain	0.54
BayesDel_addAF	Benign	-0.024	T
BayesDel_noAF	Benign	-0.27
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.22	T
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.82
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.051	D
MetaRNN	Uncertain	0.50	D
MetaSVM	Benign	-0.54	T
MutationAssessor	Pathogenic	3.4	M
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.52	T
PROVEAN	Pathogenic	-7.7	D
REVEL	Uncertain	0.41
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.020	D
Polyphen		1.0	D
Vest4		0.27
MutPred		0.51		Loss of catalytic residue at P278 (P = 0.016);
MVP		0.63
MPC		1.1
ClinPred		1.0	D
GERP RS		5.8
Varity_R		0.50
gMVP		0.61

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr2-178482595;