chr6-118559048-T-TTGCTGATCTGTATCATCGTGA

Position:

• chr6-118559048-T-TTGCTGATCTGTATCATCGTGA

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM4

The NM_002667.5(PLN):​c.132_152dup​(p.Ile45_Leu51dup) variant causes a inframe insertion 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: PLN NM_002667.5 inframe_insertion
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 6.64

Genes affected

PLN (HGNC:9080): (phospholamban) The protein encoded by this gene is found as a pentamer and is a major substrate for the cAMP-dependent protein kinase in cardiac muscle. The encoded protein is an inhibitor of cardiac muscle sarcoplasmic reticulum Ca(2+)-ATPase in the unphosphorylated state, but inhibition is relieved upon phosphorylation of the protein. The subsequent activation of the Ca(2+) pump leads to enhanced muscle relaxation rates, thereby contributing to the inotropic response elicited in heart by beta-agonists. The encoded protein is a key regulator of cardiac diastolic function. Mutations in this gene are a cause of inherited human dilated cardiomyopathy with refractory congestive heart failure, and also familial hypertrophic cardiomyopathy. [provided by RefSeq, Apr 2016]

CEP85L (HGNC:21638): (centrosomal protein 85 like) The protein encoded by this gene was identified as a breast cancer antigen. Nothing more is known of its function at this time. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a chain Cardiac phospholamban (size 51) in uniprot entity PPLA_HUMAN there are 10 pathogenic changes around while only 0 benign (100%) in NM_002667.5
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_002667.5.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
PLN	NM_002667.5	c.132_152dup	p.Ile45_Leu51dup	inframe_insertion	2/2	ENST00000357525.6
CEP85L	NM_001042475.3	c.1020+6480_1020+6481insTCACGATGATACAGATCAGCA		intron_variant		ENST00000368491.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
PLN	ENST00000357525.6	c.132_152dup	p.Ile45_Leu51dup	inframe_insertion	2/2	1	NM_002667.5	P1
CEP85L	ENST00000368491.8	c.1020+6480_1020+6481insTCACGATGATACAGATCAGCA		intron_variant		1	NM_001042475.3	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Dilated cardiomyopathy 1P Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Mar 22, 2023

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. Experimental studies and prediction algorithms are not available or were not evaluated, and the functional significance of this variant is currently unknown. ClinVar contains an entry for this variant (Variation ID: 464268). This variant has not been reported in the literature in individuals affected with PLN-related conditions. This variant is not present in population databases (gnomAD no frequency). This variant, c.132_152dup, results in the insertion of 7 amino acid(s) of the PLN protein (p.Ile45_Leu51dup), but otherwise preserves the integrity of the reading frame. -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 21, 2020

Has not been previously published as pathogenic or benign to our knowledge; Not observed in large population cohorts (Lek et al., 2016); In-frame insertion of seven amino acids in a non-repeat region -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1554219865; hg19: chr6-118880211;