2-43918025-CT-C

Variant names:

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_133259.4(LRPPRC):c.3147delA(p.Ala1051HisfsTer6) variant causes a frameshift, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000263 in 1,443,608 control chromosomes in the GnomAD database, with no homozygous occurrence. 1/1 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.0 ( 0 hom., cov: 30)

Exomes 𝑓: 0.000026 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

LRPPRC
NM_133259.4 frameshift, splice_region

Scores

Not classified

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:2

Conservation

PhyloP100: 1.33

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

congenital lactic acidosis, Saguenay-Lac-Saint-Jean type
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, G2P, Labcorp Genetics (formerly Invitae)
cytochrome-c oxidase deficiency disease
Inheritance: AR Classification: DEFINITIVE Submitted by: Myriad Women’s Health
Leigh syndrome
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen

LRPPRC links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 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;

PP5

Variant 2-43918025-CT-C is Pathogenic according to our data. Variant chr2-43918025-CT-C is described in ClinVar as Pathogenic/Likely_pathogenic. ClinVar VariationId is 1939312.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
LRPPRC	NM_133259.4 link	c.3147delA	p.Ala1051HisfsTer6	frameshift_variant, splice_region_variant	Exon 29 of 38	ENST00000260665.12	NP_573566.2	P42704E5KNY5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
LRPPRC	ENST00000260665.12 link	c.3147delA	p.Ala1051HisfsTer6	frameshift_variant, splice_region_variant	Exon 29 of 38	1	NM_133259.4	ENSP00000260665.7		P42704

Frequencies

GnomAD3 genomes

AF:

0.00

AC:

AN:

150726

Hom.:

Cov.:

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00000410

AC:

AN:

243620

AF XY:

0.00000760

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000263

AC:

AN:

1443608

Hom.:

Cov.:

AF XY:

0.0000167

AC XY:

AN XY:

718748

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.0000303

AC:

AN:

33044

American (AMR)

AF:

0.00

AC:

AN:

44516

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25894

East Asian (EAS)

AF:

0.00

AC:

AN:

39282

South Asian (SAS)

AF:

0.0000233

AC:

AN:

85864

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53110

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5698

European-Non Finnish (NFE)

AF:

0.0000319

AC:

AN:

1096574

Other (OTH)

AF:

0.00

AC:

AN:

59626

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.247

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Data not reliable, filtered out with message: AC0;AS_VQSR

AF:

0.00

AC:

AN:

150726

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73556

African (AFR)

AF:

0.00

AC:

AN:

40918

American (AMR)

AF:

0.00

AC:

AN:

15134

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3458

East Asian (EAS)

AF:

0.00

AC:

AN:

5136

South Asian (SAS)

AF:

0.00

AC:

AN:

4728

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10430

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67618

Other (OTH)

AF:

0.00

AC:

AN:

2076

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

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

Pathogenic:1

Apr 21, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Pathogenic:1

Jan 22, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

For these reasons, this variant has been classified as Pathogenic. This variant has not been reported in the literature in individuals affected with LRPPRC-related conditions. The frequency data for this variant in the population databases is considered unreliable, as metrics indicate poor data quality at this position in the gnomAD database. This sequence change creates a premature translational stop signal (p.Ala1051Hisfs*6) in the LRPPRC gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in LRPPRC are known to be pathogenic (PMID: 26510951). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

1.3

Mutation Taster

=7/193

disease causing (fs/PTC)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over