17-59674708-C-G

Variant names:

• chr17-59674708-C-G
• rs752683241
• NM_004859.4:c.2426C>G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 6P and 5B. PM2 PP3_Strong BS1_Supporting BS2

The NM_004859.4(CLTC):​c.2426C>G​(p.Pro809Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000343 in 1,458,434 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: 32)
  • Exomes 𝑓: 0.0000034 (0 hom.)
• Consequence: CLTC NM_004859.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.91

Genes affected

CLTC (HGNC:2092): (clathrin heavy chain) Clathrin is a major protein component of the cytoplasmic face of intracellular organelles, called coated vesicles and coated pits. These specialized organelles are involved in the intracellular trafficking of receptors and endocytosis of a variety of macromolecules. The basic subunit of the clathrin coat is composed of three heavy chains and three light chains. [provided by RefSeq, Jul 2008]

PTRH2 (HGNC:24265): (peptidyl-tRNA hydrolase 2) The protein encoded by this gene is a mitochondrial protein with two putative domains, an N-terminal mitochondrial localization sequence, and a UPF0099 domain. In vitro assays suggest that this protein possesses peptidyl-tRNA hydrolase activity, to release the peptidyl moiety from tRNA, thereby preventing the accumulation of dissociated peptidyl-tRNA that could reduce the efficiency of translation. This protein also plays a role regulating cell survival and death. It promotes survival as part of an integrin-signaling pathway for cells attached to the extracellular matrix (ECM), but also promotes apoptosis in cells that have lost their attachment to the ECM, a process called anoikos. After loss of cell attachment to the ECM, this protein is phosphorylated, is released from the mitochondria into the cytosol, and promotes caspase-independent apoptosis through interactions with transcriptional regulators. This gene has been implicated in the development and progression of tumors, and mutations in this gene have been associated with an infantile multisystem neurologic, endocrine, and pancreatic disease (INMEPD) characterized by intellectual disability, postnatal microcephaly, progressive cerebellar atrophy, hearing impairment, polyneuropathy, failure to thrive, and organ fibrosis with exocrine pancreas insufficiency (PMID: 25574476). Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Mar 2015]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.949
• BS1: Variant frequency is greater than expected in population amr. gnomad4_exome allele frequency = 0.00000343 (5/1458434) while in subpopulation AMR AF= 0.000113 (5/44250). AF 95% confidence interval is 0.000044. There are 0 homozygotes in gnomad4_exome. There are 2 alleles in male gnomad4_exome subpopulation. Median coverage is 30. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High AC in GnomAdExome4 at 5 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLTC	NM_004859.4	c.2426C>G	p.Pro809Arg	missense_variant	Exon 16 of 32	ENST00000269122.8	NP_004850.1
CLTC	NM_001288653.2	c.2438C>G	p.Pro813Arg	missense_variant	Exon 16 of 32		NP_001275582.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLTC	ENST00000269122.8	c.2426C>G	p.Pro809Arg	missense_variant	Exon 16 of 32	1	NM_004859.4	ENSP00000269122.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.0000161 AC: 4 AN: 248406 Hom.: 0 AF XY: 0.0000223 AC XY: 3 AN XY: 134262

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000118

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: 0.00000343 AC: 5 AN: 1458434 Hom.: 0 Cov.: 30 AF XY: 0.00000276 AC XY: 2 AN XY: 725416

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.000113

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.: 32

Bravo AF: 0.00000378

ExAC AF: 0.0000330 AC: 4

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Sep 07, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals affected with CLTC-related conditions. This variant is present in population databases (rs752683241, gnomAD 0.009%). This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 813 of the CLTC protein (p.Pro813Arg). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Uncertain	0.15	D
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Benign	0.36	T;.;T
Eigen	Pathogenic	0.96
Eigen_PC	Pathogenic	0.91
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D
M_CAP	Benign	0.078	D
MetaRNN	Pathogenic	0.95	D;D;D
MetaSVM	Benign	-0.53	T
MutationAssessor	Pathogenic	3.3	.;M;M
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-6.1	.;D;D
REVEL	Pathogenic	0.74
Sift	Pathogenic	0.0	.;D;D
Sift4G	Pathogenic	0.0	D;D;D
Polyphen		1.0, 1.0	.;D;D
Vest4		0.89
MutPred		0.86		.;Loss of ubiquitination at K806 (P = 0.0357);Loss of ubiquitination at K806 (P = 0.0357);
MVP		0.81
MPC		2.6
ClinPred		0.96	D
GERP RS		5.7
RBP_binding_hub_radar		1.0
RBP_regulation_power_radar		2.7
Varity_R		0.85
gMVP		0.90

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

Publications

LitVar

Other links and lift over

dbSNP: rs752683241; hg19: chr17-57752069;