1-241519717-G-C

Variant names:

• chr1-241519717-G-C
• rs199971078
• NM_000143.4:c.6C>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_000143.4(FH):​c.6C>G​(p.Tyr2*) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000359 in 1,392,218 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. Y2Y) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000036 (0 hom.)
• Consequence: FH NM_000143.4 stop_gained
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 0.612
• 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: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, G2P, ClinGen, Ambry Genetics
• fumaric aciduria

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• 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: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 492 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 1-241519717-G-C is Pathogenic according to our data. Variant chr1-241519717-G-C is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 460375.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000143.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FH	NM_000143.4	MANE Select	c.6C>G	p.Tyr2*	stop_gained	Exon 1 of 10	NP_000134.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FH	ENST00000366560.4	TSL:1 MANE Select	c.6C>G	p.Tyr2*	stop_gained	Exon 1 of 10	ENSP00000355518.4	P07954-1
	FH	ENST00000958409.1		c.6C>G	p.Tyr2*	stop_gained	Exon 1 of 10	ENSP00000628468.1
	FH	ENST00000932939.1		c.6C>G	p.Tyr2*	stop_gained	Exon 1 of 10	ENSP00000602998.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000359 AC: 5 AN: 1392218 Hom.: 0 Cov.: 31 AF XY: 0.00000292 AC XY: 2 AN XY: 685860

African (AFR) AF: 0.00 AC: 0 AN: 31230

American (AMR) AF: 0.00 AC: 0 AN: 35476

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25036

East Asian (EAS) AF: 0.00 AC: 0 AN: 35514

South Asian (SAS) AF: 0.00 AC: 0 AN: 78744

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48482

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4262

European-Non Finnish (NFE) AF: 0.00000465 AC: 5 AN: 1075898

Other (OTH) AF: 0.00 AC: 0 AN: 57576

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
2	-	-	not provided (2)
1	-	-	Fumarase deficiency (1)
-	1	-	Hereditary cancer-predisposing syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	36
DANN	Uncertain	0.99
Eigen	Benign	0.073
Eigen_PC	Benign	-0.19
FATHMM_MKL	Uncertain	0.83	D
PhyloP100		0.61
Vest4		0.46
GERP RS		-0.034
PromoterAI		0.063	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Mutation Taster		=5/195	disease causing (ClinVar)

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: rs199971078; hg19: chr1-241683017;