11-119088761-G-T

Variant names:

• chr11-119088761-G-T
• rs773644700
• NM_000190.4:c.160+54G>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_001425062.1(HMBS):​c.-93G>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000843 in 1,185,898 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 8.4e-7 (0 hom.)
• Consequence: HMBS NM_001425062.1 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.269
• Publications: 0 publications found

Genes affected

HMBS (HGNC:4982): (hydroxymethylbilane synthase) This gene encodes a member of the hydroxymethylbilane synthase superfamily. The encoded protein is the third enzyme of the heme biosynthetic pathway and catalyzes the head to tail condensation of four porphobilinogen molecules into the linear hydroxymethylbilane. Mutations in this gene are associated with the autosomal dominant disease acute intermittent porphyria. Alternatively spliced transcript variants encoding different isoforms have been described. [provided by RefSeq, Jul 2008]

HMBS Gene-Disease associations (from GenCC):

• acute intermittent porphyria

  Inheritance: AD, SD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, Genomics England PanelApp, ClinGen, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.73).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001425062.1. 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
	HMBS	NM_000190.4	MANE Select	c.160+54G>T		intron	N/A	NP_000181.2
	HMBS	NM_001425062.1		c.-93G>T		5_prime_UTR	Exon 3 of 14	NP_001411991.1	A0A8I5KXV4
	HMBS	NM_001425056.1		c.160+54G>T		intron	N/A	NP_001411985.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	HMBS	ENST00000652429.1	MANE Select	c.160+54G>T		intron	N/A	ENSP00000498786.1	P08397-1
	HMBS	ENST00000392841.1	TSL:1	c.109+54G>T		intron	N/A	ENSP00000376584.1	P08397-2
	HMBS	ENST00000545621.5	TSL:1	n.214G>T		non_coding_transcript_exon	Exon 3 of 10	ENSP00000444849.1	F5H4X2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 8.43e-7 AC: 1 AN: 1185898 Hom.: 0 Cov.: 17 AF XY: 0.00 AC XY: 0 AN XY: 603208

African (AFR) AF: 0.00 AC: 0 AN: 27966

American (AMR) AF: 0.00 AC: 0 AN: 44376

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 24430

East Asian (EAS) AF: 0.00 AC: 0 AN: 38492

South Asian (SAS) AF: 0.00 AC: 0 AN: 80812

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53330

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5260

European-Non Finnish (NFE) AF: 0.00000116 AC: 1 AN: 860066

Other (OTH) AF: 0.00 AC: 0 AN: 51166

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.73
CADD	Benign	12
DANN	Benign	0.97
PhyloP100		0.27
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs773644700;

hg19: chr11-118959471;