X-10213705-C-T

Position:

• chrX-10213705-C-T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM1 PM2 PP2 PP3_Strong PP5_Moderate

The NM_001830.4(CLCN4):​c.1601C>T​(p.Ser534Leu) 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. 12/20 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. S534S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 24)
• Consequence: CLCN4 NM_001830.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.75

Genes affected

CLCN4 (HGNC:2022): (chloride voltage-gated channel 4) The CLCN family of voltage-dependent chloride channel genes comprises nine members (CLCN1-7, Ka and Kb) which demonstrate quite diverse functional characteristics while sharing significant sequence homology. Chloride channel 4 has an evolutionary conserved CpG island and is conserved in both mouse and hamster. This gene is mapped in close proximity to APXL (Apical protein Xenopus laevis-like) and OA1 (Ocular albinism type I), which are both located on the human X chromosome at band p22.3. The physiological role of chloride channel 4 remains unknown but may contribute to the pathogenesis of neuronal disorders. Alternate splicing results in two transcript variants that encode different proteins. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_001830.4
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CLCN4. . Gene score misZ 4.5166 (greater than the threshold 3.09). GenCC has associacion of gene with non-syndromic X-linked intellectual disability, intellectual disability, X-linked 49.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.989
• PP5: Variant X-10213705-C-T is Pathogenic according to our data. Variant chrX-10213705-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 209113.Status of the report is criteria_provided_single_submitter, 1 stars. Variant chrX-10213705-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CLCN4	NM_001830.4	c.1601C>T	p.Ser534Leu	missense_variant	11/13	ENST00000380833.9
CLCN4	NM_001256944.2	c.1319C>T	p.Ser440Leu	missense_variant	9/11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CLCN4	ENST00000380833.9	c.1601C>T	p.Ser534Leu	missense_variant	11/13	1	NM_001830.4	P4

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 24

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

CLCN4-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Sydney Children's Hospital, SCHN

Mar 22, 2016

De novo variant. Clinical phenotype consistent with case series of individuals with CLCN4 related disorder. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.69	D
BayesDel_noAF	Pathogenic	0.75
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.93	.;D;D
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Pathogenic	0.93	D
MetaRNN	Pathogenic	0.99	D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	4.7	.;H;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Pathogenic	0.89	D
PROVEAN	Pathogenic	-4.6	D;D;D
REVEL	Pathogenic	0.95
Sift	Pathogenic	0.0	D;D;D
Sift4G	Pathogenic	0.0010	D;D;D
Polyphen		0.98	.;D;.
Vest4		0.95
MutPred		0.90		.;Loss of catalytic residue at S534 (P = 0.0064);.;
MVP		1.0
MPC		2.2
ClinPred		1.0	D
GERP RS		5.3
Varity_R		0.82
gMVP		0.99

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: rs879255582; hg19: chrX-10181745;