11-61959892-G-T

Variant names:

• chr11-61959892-G-T
• rs121918287
• NM_004183.4:c.949G>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_001363593.3(BEST1):​c.-24G>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: BEST1 NM_001363593.3 5_prime_UTR_premature_start_codon_gain
• Scores: Splicing: ADA: 0.9998
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.04
• Publications: 0 publications found

Genes affected

BEST1 (HGNC:12703): (bestrophin 1) This gene encodes a member of the bestrophin gene family. This small gene family is characterized by proteins with a highly conserved N-terminus with four to six transmembrane domains. Bestrophins may form chloride ion channels or may regulate voltage-gated L-type calcium-ion channels. Bestrophins are generally believed to form calcium-activated chloride-ion channels in epithelial cells but they have also been shown to be highly permeable to bicarbonate ion transport in retinal tissue. Mutations in this gene are responsible for juvenile-onset vitelliform macular dystrophy (VMD2), also known as Best macular dystrophy, in addition to adult-onset vitelliform macular dystrophy (AVMD) and other retinopathies. Alternative splicing results in multiple variants encoding distinct isoforms.[provided by RefSeq, Nov 2008]

FTH1 (HGNC:3976): (ferritin heavy chain 1) This gene encodes the heavy subunit of ferritin, the major intracellular iron storage protein in prokaryotes and eukaryotes. It is composed of 24 subunits of the heavy and light ferritin chains. Variation in ferritin subunit composition may affect the rates of iron uptake and release in different tissues. A major function of ferritin is the storage of iron in a soluble and nontoxic state. Defects in ferritin proteins are associated with several neurodegenerative diseases. This gene has multiple pseudogenes. Several alternatively spliced transcript variants have been observed, but their biological validity has not been determined. [provided by RefSeq, Jul 2008]

FTH1 Gene-Disease associations (from GenCC):

• hemochromatosis type 5

  Inheritance: AD, Unknown Classification: MODERATE, SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Genomics England PanelApp, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet
• neurodegeneration with brain iron accumulation 9

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics, ClinGen

LOC107984334 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001363593.3. 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
	BEST1	NM_004183.4	MANE Select	c.949G>T	p.Val317Leu	missense splice_region	Exon 9 of 11	NP_004174.1	O76090-1
	BEST1	NM_001363593.3		c.-24G>T		5_prime_UTR_premature_start_codon_gain	Exon 7 of 8	NP_001350522.1
	BEST1	NM_001440571.1		c.949G>T	p.Val317Leu	missense splice_region	Exon 9 of 10	NP_001427500.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BEST1	ENST00000378043.9	TSL:1 MANE Select	c.949G>T	p.Val317Leu	missense splice_region	Exon 9 of 11	ENSP00000367282.4	O76090-1
	BEST1	ENST00000449131.6	TSL:1	c.769G>T	p.Val257Leu	missense splice_region	Exon 8 of 9	ENSP00000399709.2	O76090-3
	FTH1	ENST00000530019.5	TSL:4	c.274C>A	p.Pro92Thr	missense	Exon 3 of 3	ENSP00000433470.1	E9PKY7

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	Autosomal recessive bestrophinopathy (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.90
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	34
DANN	Uncertain	1.0
Eigen	Pathogenic	0.93
Eigen_PC	Pathogenic	0.83
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Benign	0.33	T
M_CAP	Uncertain	0.20	D
MetaRNN	Uncertain	0.44	T
MetaSVM	Pathogenic	1.0	D
PhyloP100		8.0
PROVEAN	Benign	-0.48	N
REVEL	Uncertain	0.43
Sift	Uncertain	0.013	D
Sift4G	Benign	0.27	T
Vest4		0.32
MutPred		0.17		Loss of catalytic residue at H50 (P = 0.1031)
MVP		0.96
ClinPred		0.99	D
GERP RS		4.7
Varity_R		0.68
Mutation Taster		=4/96	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
dbscSNV1_RF	Pathogenic	0.97
SpliceAI score (max)		0.10		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: rs121918287; hg19: chr11-61727364;