Genetic Variant NM_173550.4:c.350G>T (chr9-15579021-G-T) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_173550.4(CCDC171):c.350G>T(p.Cys117Phe) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,459,852 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 17/22 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

CCDC171
NM_173550.4 missense, splice_region

Scores

Splicing: ADA: 0.00008523

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.535

Variant links:

Genes affected

CCDC171 (HGNC:29828): (coiled-coil domain containing 171)

CCDC171 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.06754708).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCDC171	NM_173550.4 link	c.350G>T	p.Cys117Phe	missense_variant, splice_region_variant	Exon 4 of 26	ENST00000380701.8	NP_775821.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCDC171	ENST00000380701.8 link	c.350G>T	p.Cys117Phe	missense_variant, splice_region_variant	Exon 4 of 26	1	NM_173550.4	ENSP00000370077.3		Q6TFL3-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000799

AC:

AN:

250198

Hom.:

AF XY:

0.00000739

AC XY:

AN XY:

135312

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000584

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:

0.00000274

AC:

AN:

1459852

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726350

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000899

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

Cov.:

Bravo

AF:

0.00000756

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jul 14, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.350G>T (p.C117F) alteration is located in exon 4 (coding exon 3) of the CCDC171 gene. This alteration results from a G to T substitution at nucleotide position 350, causing the cysteine (C) at amino acid position 117 to be replaced by a phenylalanine (F). 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

0.064

BayesDel_addAF

Benign

-0.20

BayesDel_noAF

Benign

-0.52

CADD

Benign

DANN

Benign

0.95

DEOGEN2

Benign

0.026

Eigen

Benign

-0.69

Eigen_PC

Benign

-0.57

FATHMM_MKL

Benign

0.63

LIST_S2

Benign

0.69

M_CAP

Benign

0.0075

MetaRNN

Benign

0.068

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.7

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.74

REVEL

Benign

0.063

Sift

Benign

0.44

Sift4G

Uncertain

0.051

Polyphen

0.019

Vest4

0.46

MutPred

0.16

Gain of MoRF binding (P = 0.0964);

MVP

0.11

ClinPred

0.039

GERP RS

1.2

Varity_R

0.044

gMVP

0.019

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Benign

0.000085

dbscSNV1_RF

Benign

0.0060

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