Genetic Variant CCT4:p.Glu438Gly (chr2-61872260-T-C) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 1P and 4B. PP3BS2

The NM_006430.4(CCT4):c.1313A>G(p.Glu438Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000958 in 1,460,878 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000096 ( 0 hom. )

Consequence

CCT4
NM_006430.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 7.95

Publications

0 publications found

Variant links:

Genes affected

CCT4 (HGNC:1617): (chaperonin containing TCP1 subunit 4) The chaperonin containing TCP1 (MIM 186980) complex (CCT), also called the TCP1 ring complex, consists of 2 back-to-back rings, each containing 8 unique but homologous subunits, such as CCT4. CCT assists the folding of newly translated polypeptide substrates through multiple rounds of ATP-driven release and rebinding of partially folded intermediate forms. Substrates of CCT include the cytoskeletal proteins actin (see MIM 102560) and tubulin (see MIM 191130), as well as alpha-transducin (MIM 139330) (Won et al., 1998 [PubMed 9819444]).[supplied by OMIM, Mar 2008]

CCT4 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: G2P
neurodevelopmental disorder
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

CCT4 links:

ENSG00000236498 (HGNC:):

ENSG00000236498 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.798

BS2

High AC in GnomAdExome4 at 14 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CCT4	NM_006430.4 link	c.1313A>G	p.Glu438Gly	missense_variant	Exon 12 of 14	ENST00000394440.8	NP_006421.2	P50991-1
CCT4	NM_001256721.1 link	c.1223A>G	p.Glu408Gly	missense_variant	Exon 11 of 13		NP_001243650.1	P50991-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CCT4	ENST00000394440.8 link	c.1313A>G	p.Glu438Gly	missense_variant	Exon 12 of 14	1	NM_006430.4	ENSP00000377958.3		P50991-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000958

AC:

AN:

1460878

Hom.:

Cov.:

AF XY:

0.0000110

AC XY:

AN XY:

726766

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33474

American (AMR)

AF:

0.00

AC:

AN:

44710

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39674

South Asian (SAS)

AF:

0.00

AC:

AN:

86158

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53328

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000126

AC:

AN:

1111328

Other (OTH)

AF:

0.00

AC:

AN:

60334

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.439

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jun 02, 2023

Ambry Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.1313A>G (p.E438G) alteration is located in exon 12 (coding exon 12) of the CCT4 gene. This alteration results from a A to G substitution at nucleotide position 1313, causing the glutamic acid (E) at amino acid position 438 to be replaced by a glycine (G). 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

0.17

BayesDel_addAF

Pathogenic

0.37

BayesDel_noAF

Pathogenic

0.30

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.74

D;.

Eigen

Uncertain

0.46

Eigen_PC

Uncertain

0.53

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.95

D;D

M_CAP

Benign

0.069

MetaRNN

Pathogenic

0.80

D;D

MetaSVM

Uncertain

0.26

MutationAssessor

Uncertain

2.7

M;.

PhyloP100

7.9

PrimateAI

Uncertain

0.67

PROVEAN

Uncertain

-3.0

D;D

REVEL

Pathogenic

0.74

Sift

Uncertain

0.025

D;D

Sift4G

Uncertain

0.020

D;D

Polyphen

0.32

B;.

Vest4

0.83

MutPred

0.49

Gain of catalytic residue at S440 (P = 0.1051);.;

MVP

0.75

MPC

0.75

ClinPred

0.95

GERP RS

5.3

Varity_R

0.75

gMVP

0.73

Mutation Taster

=45/55

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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2-61872260-T-C

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