chr19-54155385-T-C

Variant names:

• chr19-54155385-T-C
• NM_014516.4:c.2240T>C

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PM1 PM2 PP3_Strong PP5_Moderate

The NM_014516.4(CNOT3):​c.2240T>C​(p.Leu747Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: CNOT3 NM_014516.4 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.40
• Publications: 0 publications found

Genes affected

CNOT3 (HGNC:7879): (CCR4-NOT transcription complex subunit 3) Involved in regulation of stem cell population maintenance. Part of CCR4-NOT complex. [provided by Alliance of Genome Resources, Apr 2022]

LENG1 (HGNC:15502): (leukocyte receptor cluster member 1)

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PM1: In a region_of_interest Repressor domain (size 92) in uniprot entity CNOT3_HUMAN there are 5 pathogenic changes around while only 0 benign (100%) in NM_014516.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.966
• PP5: Variant 19-54155385-T-C is Pathogenic according to our data. Variant chr19-54155385-T-C is described in ClinVar as [Likely_pathogenic]. Clinvar id is 3387819.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNOT3	NM_014516.4	c.2240T>C	p.Leu747Pro	missense_variant	Exon 18 of 18	ENST00000221232.11	NP_055331.1
LENG1	NM_024316.3	c.*336A>G		3_prime_UTR_variant	Exon 4 of 4	ENST00000222224.4	NP_077292.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CNOT3	ENST00000221232.11	c.2240T>C	p.Leu747Pro	missense_variant	Exon 18 of 18	1	NM_014516.4	ENSP00000221232.5
LENG1	ENST00000222224.4	c.*336A>G		3_prime_UTR_variant	Exon 4 of 4	1	NM_024316.3	ENSP00000222224.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual developmental disorder with speech delay, autism, and dysmorphic facies Pathogenic:1

Aug 13, 2023

Cytogenetique et Genetique Moleculaire, CHU Besancon

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The NM_014516.4:c.2240T>C variant is a missense variant in CNOT3 for which computational prediction tools unanimously support a deleterious effect on the gene (PP3). CNOT3 is a gene with low rate of benign missense mutations and for which missense mutation is a common mechanism of a disease (Missense Z-score =3,78 ; https://gnomad.broadinstitute.org/) (PP2). This variant was found in a proband with language delay and complete agenesis of the corpus callosum. The variant has been identified as a de novo occurrence, without confirmation of paternity and maternity, in one individual with a phenotype consistent with the gene (PM6). This variant is not present in gnomAD (PM2; https://gnomad.broadinstitute.org/ v4.1.0). In summary, this variant meets criteria to be classified as likely pathogenic for CNOT3-related neurodevelopmental disorders based on the ACMG/AMP criteria applied (PM2 PM6 PP2 PP3). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.32	D
BayesDel_noAF	Pathogenic	0.22
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.55	D;D;.
Eigen	Pathogenic	0.90
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.98	D
M_CAP	Uncertain	0.19	D
MetaRNN	Pathogenic	0.97	D;D;D
MetaSVM	Uncertain	0.30	D
MutationAssessor	Pathogenic	4.2	H;H;.
PhyloP100		7.4
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-5.6	D;.;D
REVEL	Pathogenic	0.67
Sift	Pathogenic	0.0	D;.;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0	D;D;.
Vest4		0.82
MutPred		0.90		Gain of disorder (P = 0.0151);Gain of disorder (P = 0.0151);.;
MVP		0.76
ClinPred		1.0	D
GERP RS		4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.97
gMVP		0.99
Mutation Taster		=38/62	disease causing

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

hg19: chr19-54659123;