rs74315327

Positions:

• chr1-146019530-A-G

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_213653.4(HJV):​c.302T>C​(p.Leu101Pro) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000037 in 1,460,758 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 Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.000037 (0 hom.)
• Consequence: HJV NM_213653.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:3
• Conservation: PhyloP100: 8.45

Genes affected

HJV (HGNC:4887): (hemojuvelin BMP co-receptor) The product of this gene is involved in iron metabolism. It may be a component of the signaling pathway which activates hepcidin or it may act as a modulator of hepcidin expression. It could also represent the cellular receptor for hepcidin. Two uORFs in the 5' UTR negatively regulate the expression and activity of the encoded protein. Alternatively spliced transcript variants encoding different isoforms have been identified for this gene. Defects in this gene are the cause of hemochromatosis type 2A, also called juvenile hemochromatosis (JH). JH is an early-onset autosomal recessive disorder due to severe iron overload resulting in hypogonadotrophic hypogonadism, hepatic fibrosis or cirrhosis and cardiomyopathy, occurring typically before age of 30. [provided by RefSeq, Oct 2015]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.962
• PP5: Variant 1-146019530-A-G is Pathogenic according to our data. Variant chr1-146019530-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 2370.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
HJV	NM_213653.4	c.302T>C	p.Leu101Pro	missense_variant	3/4	ENST00000336751.11	NP_998818.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
HJV	ENST00000336751.11	c.302T>C	p.Leu101Pro	missense_variant	3/4	2	NM_213653.4	ENSP00000337014.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000412 AC: 1 AN: 242520 Hom.: 0 AF XY: 0.00000757 AC XY: 1 AN XY: 132102

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 SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000933

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000370 AC: 54 AN: 1460758 Hom.: 0 Cov.: 35 AF XY: 0.0000399 AC XY: 29 AN XY: 726680

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000477

Gnomad4 OTH exome AF: 0.0000166

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hemochromatosis type 2A Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

OMIM

Oct 01, 2004

- -

HJV-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Feb 07, 2023

The HJV c.302T>C variant is predicted to result in the amino acid substitution p.Leu101Pro. This variant has previously been reported to be causative for hemachromatosis (Lee et al 2004. PubMed ID: 14982867; Le Gac G et al 2004. PubMed ID: 15254010; Hamdi-Rozé H et al 2018. PubMed ID: 30389309; Lee PL et al 2004. PubMed ID: 15461631). This variant is reported in 0.00093% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/1-145415483-T-C). This variant is interpreted as pathogenic. -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 31, 2024

This sequence change replaces leucine, which is neutral and non-polar, with proline, which is neutral and non-polar, at codon 101 of the HJV protein (p.Leu101Pro). This variant is present in population databases (rs74315327, gnomAD 0.002%). This missense change has been observed in individual(s) with hemochromatosis (PMID: 14982867, 14982873, 30389309). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 2370). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_noAF	Pathogenic	0.32
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.98	D
LIST_S2	Uncertain	0.92	D
MetaRNN	Pathogenic	0.96	D
PROVEAN	Pathogenic	-6.2	D
Sift	Uncertain	0.0020	D
Sift4G	Pathogenic	0.0	D
Vest4		1.0
gMVP		1.0

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: rs74315327; hg19: chr1-145415483;