2-238253316-C-A

Variant names:

• chr2-238253316-C-A
• rs35333999
• NM_022817.3:c.2707G>T

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_022817.3(PER2):​c.2707G>T​(p.Val903Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,338 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: PER2 NM_022817.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.349
• Publications: 0 publications found

Genes affected

PER2 (HGNC:8846): (period circadian regulator 2) This gene is a member of the Period family of genes and is expressed in a circadian pattern in the suprachiasmatic nucleus, the primary circadian pacemaker in the mammalian brain. Genes in this family encode components of the circadian rhythms of locomotor activity, metabolism, and behavior. This gene is upregulated by CLOCK/ARNTL heterodimers but then represses this upregulation in a feedback loop using PER/CRY heterodimers to interact with CLOCK/ARNTL. Polymorphisms in this gene may increase the risk of getting certain cancers and have been linked to sleep disorders. [provided by RefSeq, Jan 2014]

PER2 Gene-Disease associations (from GenCC):

• advanced sleep phase syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• advanced sleep phase syndrome 1

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000225057 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

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

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022817.3. 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
	PER2	NM_022817.3	MANE Select	c.2707G>T	p.Val903Phe	missense	Exon 19 of 23	NP_073728.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PER2	ENST00000254657.8	TSL:1 MANE Select	c.2707G>T	p.Val903Phe	missense	Exon 19 of 23	ENSP00000254657.3
	PER2	ENST00000707129.1		c.2707G>T	p.Val903Phe	missense	Exon 19 of 23	ENSP00000516757.1
	PER2	ENST00000707130.1		c.2707G>T	p.Val903Phe	missense	Exon 19 of 23	ENSP00000516758.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461338 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 726892

African (AFR) AF: 0.00 AC: 0 AN: 33472

American (AMR) AF: 0.00 AC: 0 AN: 44674

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26108

East Asian (EAS) AF: 0.00 AC: 0 AN: 39682

South Asian (SAS) AF: 0.00 AC: 0 AN: 86176

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53366

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5760

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111730

Other (OTH) AF: 0.00 AC: 0 AN: 60370

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	19
DANN	Uncertain	0.99
DEOGEN2	Benign	0.22	T
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.44
FATHMM_MKL	Benign	0.15	N
LIST_S2	Benign	0.82	T
M_CAP	Benign	0.020	T
MetaRNN	Uncertain	0.58	D
MetaSVM	Benign	-1.1	T
MutationAssessor	Pathogenic	3.0	M
PhyloP100		0.35
PrimateAI	Uncertain	0.50	T
PROVEAN	Uncertain	-2.5	N
REVEL	Benign	0.13
Sift	Benign	0.12	T
Sift4G	Uncertain	0.017	D
Polyphen		1.0	D
Vest4		0.65
MutPred		0.25		Loss of catalytic residue at V903 (P = 0.0891)
MVP		0.29
MPC		0.81
ClinPred		0.94	D
GERP RS		2.4
Varity_R		0.12
gMVP		0.67
Mutation Taster		=94/6	polymorphism

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: rs35333999; hg19: chr2-239161957;