21-29073453-G-T

Variant names:

• chr21-29073453-G-T
• rs2070611
• NM_006585.4:c.60+78C>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_006585.4(CCT8):​c.60+78C>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,340 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.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CCT8 NM_006585.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.607
• Publications: 0 publications found

Genes affected

CCT8 (HGNC:1623): (chaperonin containing TCP1 subunit 8) This gene encodes the theta subunit of the CCT chaperonin, which is abundant in the eukaryotic cytosol and may be involved in the transport and assembly of newly synthesized proteins. Alternative splicing results in multiple transcript variants of this gene. A pseudogene related to this gene is located on chromosome 1. [provided by RefSeq, Sep 2013]

CCT8 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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006585.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCT8	NM_006585.4	MANE Select	c.60+78C>A		intron	N/A	NP_006576.2
	CCT8	NM_001282907.2		c.-228C>A		5_prime_UTR	Exon 1 of 16	NP_001269836.1
	CCT8	NM_001282908.2		c.-94+53C>A		intron	N/A	NP_001269837.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CCT8	ENST00000286788.9	TSL:1 MANE Select	c.60+78C>A		intron	N/A	ENSP00000286788.4
	CCT8	ENST00000470450.5	TSL:1	n.134+53C>A		intron	N/A
	CCT8	ENST00000540844.5	TSL:2	c.-80+78C>A		intron	N/A	ENSP00000442730.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1455340 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 723486

African (AFR) AF: 0.00 AC: 0 AN: 33382

American (AMR) AF: 0.00 AC: 0 AN: 44428

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25944

East Asian (EAS) AF: 0.00 AC: 0 AN: 39538

South Asian (SAS) AF: 0.00 AC: 0 AN: 86016

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 52176

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5728

European-Non Finnish (NFE) AF: 9.02e-7 AC: 1 AN: 1108034

Other (OTH) AF: 0.00 AC: 0 AN: 60094

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	5.4
DANN	Benign	0.59
PhyloP100		0.61
PromoterAI		-0.056	Neutral

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

Other links and lift over

dbSNP: rs2070611; hg19: chr21-30445774;