rs75086406

Positions:

• chr1-241513679-C-G
• chr1-241513679-C-T

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000143.4(FH):​c.302G>C​(p.Arg101Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R101Q) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: FH NM_000143.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4 O:1
• Conservation: PhyloP100: 1.84

Genes affected

FH (HGNC:3700): (fumarate hydratase) The protein encoded by this gene is an enzymatic component of the tricarboxylic acid (TCA) cycle, or Krebs cycle, and catalyzes the formation of L-malate from fumarate. It exists in both a cytosolic form and an N-terminal extended form, differing only in the translation start site used. The N-terminal extended form is targeted to the mitochondrion, where the removal of the extension generates the same form as in the cytoplasm. It is similar to some thermostable class II fumarases and functions as a homotetramer. Mutations in this gene can cause fumarase deficiency and lead to progressive encephalopathy. [provided by RefSeq, Jul 2008]

FH (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 10 uncertain in NM_000143.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.968
• PP5: Variant 1-241513679-C-G is Pathogenic according to our data. Variant chr1-241513679-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 16238.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FH	NM_000143.4	c.302G>C	p.Arg101Pro	missense_variant	3/10	ENST00000366560.4	NP_000134.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FH	ENST00000366560.4	c.302G>C	p.Arg101Pro	missense_variant	3/10	1	NM_000143.4	ENSP00000355518.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Pathogenic:2

Likely pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Apr 25, 2017	The R101P variant in the FH gene has previously been reported to segregate with disease in at least one large family with hereditary leiomyomatosis and renal cell cancer (Chan et al., 2005; Heinritz et al., 2008). This variant is not observed in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). The R101P variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position where amino acids with similar properties to Arginine are tolerated across species. In silico analysis predicts this variant is probably damaging to the protein structure/function. Based on the currently available evidence, R101P is a strong candidate for a pathogenic variant. However, the possibility it is a rare benign variant cannot be excluded. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 10, 2023	This sequence change replaces arginine, which is basic and polar, with proline, which is neutral and non-polar, at codon 101 of the FH protein (p.Arg101Pro). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with autosomal dominant FH-related conditions (PMID: 15663510, 17908262). It has also been observed to segregate with disease in related individuals. This variant is also known as R58P. ClinVar contains an entry for this variant (Variation ID: 16238). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt FH protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

Hereditary leiomyomatosis and renal cell cancer Pathogenic:1 Other:1

Pathogenic, no assertion criteria provided	literature only	OMIM	Jan 01, 2008	- -
not provided, no classification provided	literature only	GeneReviews	-	- -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 20, 2024

The p.R101P pathogenic mutation (also known as c.302G>C), located in coding exon 3 of the FH gene, results from a G to C substitution at nucleotide position 302. The arginine at codon 101 is replaced by proline, an amino acid with dissimilar properties. This mutation, designated R58P (c.173G>C), has been shown to segregate with disease in multiple individuals with features of hereditary leiomyomatosis and renal cell cancer (HLRCC) syndrome in a large Polish family (Chan I et al. Clin. Exp. Dermatol., 2005 Jan;30:75-8; Heinritz W et al. Ann. Hum. Genet., 2008 Jan;72:35-40). This variant was not reported in population-based cohorts in the Genome Aggregation Database (gnomAD). This amino acid position is well conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Pathogenic	0.51	D
BayesDel_noAF	Pathogenic	0.49
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D
Eigen	Uncertain	0.52
Eigen_PC	Uncertain	0.51
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.57	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	2.9	M
PrimateAI	Uncertain	0.57	T
PROVEAN	Uncertain	-3.0	D
REVEL	Pathogenic	0.90
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.0050	D
Polyphen		0.95	P
Vest4		0.96
MutPred		0.79		Loss of MoRF binding (P = 0.0088);
MVP		0.98
MPC		1.0
ClinPred		0.99	D
GERP RS		5.0
Varity_R		0.98
gMVP		0.97

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

LitVar

Other links and lift over

dbSNP: rs75086406; hg19: chr1-241676979;