NM_000143.4:c.71C>T

Variant names:

• chr1-241519652-G-A
• rs587778361
• NM_000143.4:c.71C>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 3P and 2B. PM2 PP2 BP4_Moderate

The NM_000143.4(FH):​c.71C>T​(p.Ser24Leu) 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 benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S24W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: FH NM_000143.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.112
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• hereditary leiomyomatosis and renal cell cancer

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Ambry Genetics, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet
• fumaric aciduria

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Orphanet, Labcorp Genetics (formerly Invitae), Ambry Genetics
• pheochromocytoma-paraganglioma

  Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
• leiomyosarcoma

  Inheritance: AD Classification: MODERATE Submitted by: Genomics England PanelApp
• hereditary pheochromocytoma-paraganglioma

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the gene, where a lot of missense mutations are associated with disease in ClinVar. The gene has 132 curated pathogenic missense variants (we use a threshold of 10). The gene has 17 curated benign missense variants. Gene score misZ: 1.2708 (below the threshold of 3.09). Trascript score misZ: 2.0634 (below the threshold of 3.09). GenCC associations: The gene is linked to fumaric aciduria, hereditary leiomyomatosis and renal cell cancer, hereditary pheochromocytoma-paraganglioma, leiomyosarcoma, pheochromocytoma-paraganglioma.
• BP4: Computational evidence support a benign effect (MetaRNN=0.12769169).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FH	NM_000143.4	c.71C>T	p.Ser24Leu	missense_variant	Exon 1 of 10	ENST00000366560.4	NP_000134.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FH	ENST00000366560.4	c.71C>T	p.Ser24Leu	missense_variant	Exon 1 of 10	1	NM_000143.4	ENSP00000355518.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1395742 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 688344

African (AFR) AF: 0.00 AC: 0 AN: 31462

American (AMR) AF: 0.00 AC: 0 AN: 35658

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25150

East Asian (EAS) AF: 0.00 AC: 0 AN: 35714

South Asian (SAS) AF: 0.00 AC: 0 AN: 79056

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48344

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4074

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1078506

Other (OTH) AF: 0.00 AC: 0 AN: 57778

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

May 03, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.S24L variant (also known as c.71C>T), located in coding exon 1 of the FH gene, results from a C to T substitution at nucleotide position 71. The serine at codon 24 is replaced by leucine, an amino acid with dissimilar properties. This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Uncertain	0.059	T
BayesDel_noAF	Benign	-0.15
CADD	Benign	13
DANN	Benign	0.83
DEOGEN2	Benign	0.25	T
Eigen	Benign	-1.2
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.037	N
LIST_S2	Benign	0.53	T
M_CAP	Uncertain	0.24	D
MetaRNN	Benign	0.13	T
MetaSVM	Uncertain	0.75	D
MutationAssessor	Benign	0.0	N
PhyloP100		0.11
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.51	N
REVEL	Uncertain	0.37
Sift	Benign	0.33	T
Sift4G	Benign	0.55	T
Polyphen		0.015	B
Vest4		0.25
MutPred		0.21		Loss of glycosylation at S24 (P = 0.0016);
MVP		0.80
MPC		0.25
ClinPred		0.11	T
GERP RS		1.6
PromoterAI		-0.097	Neutral
Varity_R		0.053
gMVP		0.48
Mutation Taster		=93/7	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: rs587778361; hg19: chr1-241682952;