4-55435530-T-C

Position:

• chr4-55435530-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_004898.4(CLOCK):​c.2426A>G​(p.Gln809Arg) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CLOCK NM_004898.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.28

Genes affected

CLOCK (HGNC:2082): (clock circadian regulator) The protein encoded by this gene plays a central role in the regulation of circadian rhythms. The protein encodes a transcription factor of the basic helix-loop-helix (bHLH) family and contains DNA binding histone acetyltransferase activity. The encoded protein forms a heterodimer with ARNTL (BMAL1) that binds E-box enhancer elements upstream of Period (PER1, PER2, PER3) and Cryptochrome (CRY1, CRY2) genes and activates transcription of these genes. PER and CRY proteins heterodimerize and repress their own transcription by interacting in a feedback loop with CLOCK/ARNTL complexes. Polymorphisms in this gene may be associated with behavioral changes in certain populations and with obesity and metabolic syndrome. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jan 2014]

TMEM165 (HGNC:30760): (transmembrane protein 165) This gene encodes a predicted transmembrane protein with a perinuclear Golgi-like distribution in fibroblasts. Mutations in this gene are associated with the autosomal recessive disorder congenital disorder of glycosylation, type IIk. Knockdown of this gene's expression causes decreased sialylation in HEK cells and suggests this gene plays a role in terminal Golgi glycosylation. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Jul 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CLOCK	NM_004898.4	c.2426A>G	p.Gln809Arg	missense_variant	23/23	ENST00000513440.6	NP_004889.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CLOCK	ENST00000513440.6	c.2426A>G	p.Gln809Arg	missense_variant	23/23	1	NM_004898.4	ENSP00000426983	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000756

ESP6500AA AF: 0.000227 AC: 1

ESP6500EA AF: 0.00 AC: 0

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 19, 2022

The c.2426A>G (p.Q809R) alteration is located in exon 23 (coding exon 20) of the CLOCK gene. This alteration results from a A to G substitution at nucleotide position 2426, causing the glutamine (Q) at amino acid position 809 to be replaced by an arginine (R). 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	Uncertain	0.38
BayesDel_addAF	Benign	-0.0090	T
BayesDel_noAF	Benign	-0.25
CADD	Uncertain	24
DANN	Uncertain	0.99
DEOGEN2	Benign	0.34	T;T;T
Eigen	Benign	0.10
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.82	T;.;.
M_CAP	Benign	0.022	T
MetaRNN	Uncertain	0.51	D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	1.8	L;L;L
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-1.9	N;N;N
REVEL	Benign	0.20
Sift	Pathogenic	0.0	D;D;D
Sift4G	Uncertain	0.013	D;D;D
Polyphen		0.44	B;B;B
Vest4		0.60
MVP		0.72
MPC		0.47
ClinPred		0.90	D
GERP RS		4.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.27
gMVP		0.64

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: rs142870025; hg19: chr4-56301697;