chr2-181558617-G-T

Variant names:

• chr2-181558617-G-T
• rs121909398
• NM_201548.5:c.769C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_201548.5(CERKL):​c.769C>A​(p.Arg257Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,512 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CERKL NM_201548.5 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.0780
• Publications: 0 publications found

Genes affected

CERKL (HGNC:21699): (ceramide kinase like) This gene was initially identified as a locus (RP26) associated with an autosomal recessive form of retinitis pigmentosa (arRP) disease. This gene encodes a protein with ceramide kinase-like domains, however, the protein does not phosphorylate ceramide and its target substrate is currently unknown. This protein may be a negative regulator of apoptosis in photoreceptor cells. Mutations in this gene cause a form of retinitis pigmentosa characterized by autosomal recessive cone and rod dystrophy (arCRD). Alternative splicing of this gene results in multiple transcript variants encoding different isoforms and non-coding transcripts.[provided by RefSeq, May 2010]

CERKL Gene-Disease associations (from GenCC):

• CERKL-related retinopathy

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• retinitis pigmentosa 26

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.68).
• BP7: Synonymous conserved (PhyloP=-0.078 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_201548.5. 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
	CERKL	NM_201548.5	MANE Select	c.769C>A	p.Arg257Arg	synonymous	Exon 5 of 13	NP_963842.1
	CERKL	NM_001030311.3		c.847C>A	p.Arg283Arg	synonymous	Exon 6 of 14	NP_001025482.1
	CERKL	NM_001160277.2		c.715C>A	p.Arg239Arg	synonymous	Exon 5 of 13	NP_001153749.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CERKL	ENST00000410087.8	TSL:1 MANE Select	c.769C>A	p.Arg257Arg	synonymous	Exon 5 of 13	ENSP00000386725.3
	CERKL	ENST00000339098.9	TSL:1	c.847C>A	p.Arg283Arg	synonymous	Exon 6 of 14	ENSP00000341159.5
	CERKL	ENST00000374967.6	TSL:1	n.*51C>A		non_coding_transcript_exon	Exon 4 of 12	ENSP00000364106.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461512 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727058

African (AFR) AF: 0.00 AC: 0 AN: 33456

American (AMR) AF: 0.00 AC: 0 AN: 44678

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26120

East Asian (EAS) AF: 0.00 AC: 0 AN: 39652

South Asian (SAS) AF: 0.00 AC: 0 AN: 86256

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53410

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5750

European-Non Finnish (NFE) AF: 0.00000360 AC: 4 AN: 1111806

Other (OTH) AF: 0.00 AC: 0 AN: 60384

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.68
CADD	Benign	1.1
DANN	Benign	0.60
PhyloP100		-0.078
Mutation Taster		=100/0	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: rs121909398; hg19: chr2-182423344;