NM_001145784.2:c.320G>A

Variant names:

• chr19-19182579-C-T
• rs570508079
• NM_001145784.2:c.320G>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001145784.2(BORCS8):​c.320G>A​(p.Gly107Asp) variant causes a missense change. The variant allele was found at a frequency of 0.00000657 in 152,300 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G107V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: BORCS8 NM_001145784.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.52
• Publications: 0 publications found

Genes affected

BORCS8 (HGNC:37247): (BLOC-1 related complex subunit 8) Involved in heart development. Part of BORC complex. [provided by Alliance of Genome Resources, Apr 2022]

BORCS8-MEF2B (HGNC:39979): (BORCS8-MEF2B readthrough) This gene represents numerous read-through transcripts that span GeneID:729991 and 100271849. Many read-through transcripts are predicted to be nonsense-mediated decay (NMD) candidates, and are thought to be non-coding. Some transcripts are predicted to be capable of translation reinitiation at a downstream AUG, resulting in expression of at least one isoform of myocyte enhancer factor 2B (MEF2B) from this read-through locus. At least one additional MEF2B variant and isoform can be expressed from a downstream promoter, and is annotated on GeneID:100271849. [provided by RefSeq, Oct 2010]

MEF2B (HGNC:6995): (myocyte enhancer factor 2B) The product of this gene is a member of the MADS/MEF2 family of DNA binding proteins. The protein is thought to regulate gene expression, including expression of the smooth muscle myosin heavy chain gene. This region undergoes considerable alternative splicing, with transcripts supporting two non-overlapping loci (GeneID 729991 and 100271849) as well as numerous read-through transcripts that span both loci (annotated as GeneID 4207). Several isoforms of this protein are expressed from either this locus or from some of the read-through transcripts annotated on GeneID 4207. [provided by RefSeq, Jan 2014]

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17293286).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001145784.2. 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
	BORCS8	NM_001145784.2	MANE Select	c.320G>A	p.Gly107Asp	missense	Exon 4 of 6	NP_001139256.1	Q96FH0-1
	BORCS8	NM_001145783.2		c.320G>A	p.Gly107Asp	missense	Exon 4 of 4	NP_001139255.1	Q96FH0-2
	BORCS8-MEF2B	NM_005919.4		c.-112G>A		5_prime_UTR	Exon 2 of 10	NP_005910.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	BORCS8	ENST00000462790.8	TSL:1 MANE Select	c.320G>A	p.Gly107Asp	missense	Exon 4 of 6	ENSP00000425864.1	Q96FH0-1
	BORCS8-MEF2B	ENST00000514819.7	TSL:5	c.16G>A	p.Ala6Thr	missense	Exon 2 of 9	ENSP00000454967.3	H3BNR1
	BORCS8	ENST00000477565.3	TSL:1	c.320G>A	p.Gly107Asp	missense	Exon 4 of 4	ENSP00000424833.1	Q96FH0-2

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152182 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1398354 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 689752

African (AFR) AF: 0.00 AC: 0 AN: 31584

American (AMR) AF: 0.00 AC: 0 AN: 35692

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25160

East Asian (EAS) AF: 0.00 AC: 0 AN: 35730

South Asian (SAS) AF: 0.00 AC: 0 AN: 79192

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48712

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5524

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1078802

Other (OTH) AF: 0.00 AC: 0 AN: 57958

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152300 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 74482

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000241 AC: 1 AN: 41562

American (AMR) AF: 0.00 AC: 0 AN: 15300

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3462

East Asian (EAS) AF: 0.00 AC: 0 AN: 5190

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 68018

Other (OTH) AF: 0.00 AC: 0 AN: 2114

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.098
BayesDel_addAF	Pathogenic	0.38	D
BayesDel_noAF	Benign	-0.19
CADD	Uncertain	24
DANN	Uncertain	1.0
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.32
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.24	T
M_CAP	Uncertain	0.14	D
MetaRNN	Benign	0.17	T
PhyloP100		6.5
Sift4G	Benign	0.80	T
Vest4		0.19
MVP		0.095
ClinPred		0.88	D
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.22
Mutation Taster		=58/42	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: rs570508079; hg19: chr19-19293388;