Genetic Variant CYTH4:p.Ala166Val (chr22-37300969-C-T) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

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

The NM_013385.5(CYTH4):c.497C>T(p.Ala166Val) variant causes a missense change. The variant allele was found at a frequency of 0.0000948 in 1,614,094 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00010 ( 0 hom. )

Consequence

CYTH4
NM_013385.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.98

Variant links:

Genes affected

CYTH4 (HGNC:9505): (cytohesin 4) This gene encodes a member of the PSCD family of proteins, which have an N-terminal coiled-coil motif, a central Sec7 domain, and a C-terminal pleckstrin homology (PH) domain. The coiled-coil motif is involved in homodimerization, the Sec7 domain contains guanine-nucleotide exchange protein (GEP) activity, and the PH domain interacts with phospholipids and is responsible for association of PSCDs with membranes. Members of this family function as GEPs for ADP-ribosylation factors (ARFs), which are guanine nucleotide-binding proteins involved in vesicular trafficking pathways. This protein exhibits GEP activity in vitro with ARF1 and ARF5, but is inactive with ARF6. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Dec 2015]

CYTH4 links:

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ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
CYTH4	NM_013385.5 link	c.497C>T	p.Ala166Val	missense_variant	Exon 7 of 13	ENST00000248901.11	NP_037517.1	Q9UIA0
CYTH4	NM_001318024.2 link	c.326C>T	p.Ala109Val	missense_variant	Exon 7 of 13		NP_001304953.1	Q9UIA0B4E2V8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CYTH4	ENST00000248901.11 link	c.497C>T	p.Ala166Val	missense_variant	Exon 7 of 13	1	NM_013385.5	ENSP00000248901.6	Q9UIA0
CYTH4	ENST00000439667.1 link	n.536C>T		non_coding_transcript_exon_variant	Exon 7 of 8	3
CYTH4	ENST00000447919.1 link	n.88C>T		non_coding_transcript_exon_variant	Exon 1 of 3	5
CYTH4	ENST00000462927.5 link	n.542C>T		non_coding_transcript_exon_variant	Exon 7 of 13	2

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152226

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.0000735

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251284

Hom.:

AF XY:

0.0000368

AC XY:

AN XY:

135862

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 SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000528

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000999

AC:

146

AN:

1461868

Hom.:

Cov.:

AF XY:

0.0000921

AC XY:

AN XY:

727238

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

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:

0.000123

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152226

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74366

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000735

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000565

Hom.:

Bravo

AF:

0.0000340

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 16, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.497C>T (p.A166V) alteration is located in exon 7 (coding exon 7) of the CYTH4 gene. This alteration results from a C to T substitution at nucleotide position 497, causing the alanine (A) at amino acid position 166 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

0.14

BayesDel_addAF

Benign

-0.12

BayesDel_noAF

Benign

-0.28

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.12

Eigen

Uncertain

0.27

Eigen_PC

Uncertain

0.30

FATHMM_MKL

Uncertain

0.89

LIST_S2

Uncertain

0.97

M_CAP

Benign

0.034

MetaRNN

Uncertain

0.51

MetaSVM

Benign

-0.62

MutationAssessor

Benign

2.0

PrimateAI

Benign

0.41

PROVEAN

Uncertain

-2.7

REVEL

Benign

0.15

Sift

Uncertain

0.015

Sift4G

Uncertain

0.014

Polyphen

0.13

Vest4

0.50

MVP

0.46

MPC

0.90

ClinPred

0.85

GERP RS

4.2

Varity_R

0.31

gMVP

0.40

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.060

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