NM_133259.4:c.4128delT

Variant names:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 12P and 1B. PVS1PM2PP3_ModerateBS1_Supporting

The NM_133259.4(LRPPRC):c.4128delT(p.Glu1377fs) variant causes a frameshift, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000789 in 1,610,276 control chromosomes in the GnomAD database, including 1 homozygotes. 1/1 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.00012 ( 1 hom., cov: 33)

Exomes 𝑓: 0.000074 ( 0 hom. )

Consequence

LRPPRC
NM_133259.4 frameshift, splice_region

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:6

Conservation

PhyloP100: 1.14

Variant links:

Genes affected

LRPPRC (HGNC:15714): (leucine rich pentatricopeptide repeat containing) This gene encodes a leucine-rich protein that has multiple pentatricopeptide repeats (PPR). The precise role of this protein is unknown but studies suggest it may play a role in cytoskeletal organization, vesicular transport, or in transcriptional regulation of both nuclear and mitochondrial genes. The protein localizes primarily to mitochondria and is predicted to have an N-terminal mitochondrial targeting sequence. Mutations in this gene are associated with the French-Canadian type of Leigh syndrome. [provided by RefSeq, Mar 2012]

LRPPRC links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: max_spliceai. No scorers claiming Uncertain. No scorers claiming Benign.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.000125 (19/152166) while in subpopulation EAS AF= 0.00231 (12/5206). AF 95% confidence interval is 0.00133. There are 1 homozygotes in gnomad4. There are 9 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRPPRC	NM_133259.4 link	c.4128delT	p.Glu1377fs	frameshift_variant, splice_region_variant	Exon 37 of 38	ENST00000260665.12	NP_573566.2	P42704E5KNY5
LRPPRC	XM_006711915.3 link	c.4050delT	p.Glu1351fs	frameshift_variant, splice_region_variant	Exon 37 of 38		XP_006711978.1
LRPPRC	XM_047442809.1 link	c.4002delT	p.Glu1335fs	frameshift_variant, splice_region_variant	Exon 37 of 38		XP_047298765.1
LRPPRC	XR_007068563.1 link	n.*88delT		downstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRPPRC	ENST00000260665.12 link	c.4128delT	p.Glu1377fs	frameshift_variant, splice_region_variant	Exon 37 of 38	1	NM_133259.4	ENSP00000260665.7		P42704

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152166

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00231

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000155

AC:

AN:

251358

Hom.:

AF XY:

0.000155

AC XY:

AN XY:

135842

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00190

Gnomad SAS exome

AF:

0.0000653

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000880

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000741

AC:

108

AN:

1458110

Hom.:

Cov.:

AF XY:

0.0000785

AC XY:

AN XY:

725656

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00166

Gnomad4 SAS exome

AF:

0.000139

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000198

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000125

AC:

AN:

152166

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74312

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00231

Gnomad4 SAS

AF:

0.000414

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.000102

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:6

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital lactic acidosis, Saguenay-Lac-Saint-Jean type

Uncertain:3

Oct 28, 2019

Natera, Inc.

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Baylor Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 18, 2016

Soonchunhyang University Bucheon Hospital, Soonchunhyang University Medical Center

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: reference population

- -

not specified

Uncertain:2

Sep 12, 2018

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant classified as Uncertain Significance - Favor Pathogenic. The p.Glu1377Ly sfsX10 variant in LRPPRC has not been previously reported in the literature but has been reported in ClinVar (Variation ID #225408). This variant has been ident ified in 0.19% (36/18864) of East Asian chromosomes by the Genome Aggregation Da tabase (gnomAD, http://gnomad.broadinstitute.org). This variant is predicted to cause a frameshift, which alters the protein?s amino acid sequence beginning at position 1377 and leads to a premature termination codon 10 amino acids downstre am. This termination codon occurs within the last exon and is, therefore, likely to escape nonsense mediated decay (NMD) and result in a truncated protein. In s ummary, while there is some suspicion for a pathogenic role, the clinical signif icance of the p.Glu1377LysfsX10 variant is uncertain. ACMG/AMP Criteria applied: PM2_Supporting, PVS1_Moderate. -

Aug 19, 2021

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: LRPPRC c.4128delT (p.Glu1377LysfsX10) results in a premature termination codon, predicted to cause a truncation of the encoded protein. The variant allele was found at a frequency of 0.00016 in 282758 control chromosomes, predominantly at a frequency of 0.002 within the East Asian subpopulation in the gnomAD database. The observed variant frequency within East Asian control individuals in the gnomAD database is approximately 4 fold of the estimated maximal expected allele frequency for a pathogenic variant in LRPPRC causing Leigh Syndrome, French-Canadian Type phenotype (0.0005), strongly suggesting that the variant is a benign polymorphism found primarily in populations of East Asian origin. To our knowledge, no occurrence of c.4128delT in individuals affected with Leigh Syndrome, French-Canadian Type and no experimental evidence demonstrating its impact on protein function have been reported. Three ClinVar submitters (evaluation after 2014) cite the variant as uncertain significance. Based on the evidence outlined above, the variant was classified as uncertain significance. -

not provided

Uncertain:1

Jun 27, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant predicted to result in abnormal protein length as the last 18 amino acids are replaced with 9 different amino acids; Has not been previously published as pathogenic or benign to our knowledge; This variant is associated with the following publications: (PMID: 26510951, 12529507) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

1.0

Details are displayed if max score is > 0.2

DS_DG_spliceai

0.98

Position offset: 2

DS_DL_spliceai

1.0

Position offset: 1

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over