chr19-7541025-C-G

Variant names:

• chr19-7541025-C-G
• rs1057518936
• NM_001166114.2:c.898C>G

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PM2 PM5 PP2 PP3_Strong PP5_Moderate

The NM_001166114.2(PNPLA6):​c.898C>G​(p.Pro300Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P300L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: PNPLA6 NM_001166114.2 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.83
• Publications: 0 publications found

Genes affected

PNPLA6 (HGNC:16268): (patatin like phospholipase domain containing 6) This gene encodes a phospholipase that deacetylates intracellular phosphatidylcholine to produce glycerophosphocholine. It is thought to function in neurite outgrowth and process elongation during neuronal differentiation. The protein is anchored to the cytoplasmic face of the endoplasmic reticulum in both neurons and non-neuronal cells. Mutations in this gene result in autosomal recessive spastic paraplegia, and the protein is the target for neurodegeneration induced by organophosphorus compounds and chemical warfare agents. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

PNPLA6 Gene-Disease associations (from GenCC):

• ataxia-hypogonadism-choroidal dystrophy syndrome

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: G2P, Orphanet
• PNPLA6-related spastic paraplegia with or without ataxia

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• hereditary spastic paraplegia 39

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet
• cerebellar ataxia-hypogonadism syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• Laurence-Moon syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• trichomegaly-retina pigmentary degeneration-dwarfism syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr19-7541025-C-A is described in ClinVar as Pathogenic. ClinVar VariationId is 854646.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP2: Missense variant in the PNPLA6 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 29 curated pathogenic missense variants (we use a threshold of 10). The gene has 7 curated benign missense variants. Gene score misZ: 4.3547 (above the threshold of 3.09). Trascript score misZ: 3.5139 (above the threshold of 3.09). GenCC associations: The gene is linked to retinal dystrophy-ataxia-pituitary hormone abnormality-hypogonadism syndrome, cerebellar ataxia-hypogonadism syndrome, PNPLA6-related spastic paraplegia with or without ataxia, ataxia-hypogonadism-choroidal dystrophy syndrome, trichomegaly-retina pigmentary degeneration-dwarfism syndrome, hereditary spastic paraplegia 39, Laurence-Moon syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.965
• PP5: Variant 19-7541025-C-G is Pathogenic according to our data. Variant chr19-7541025-C-G is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 374157.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001166114.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNPLA6	NM_001166114.2	MANE Select	c.898C>G	p.Pro300Ala	missense	Exon 7 of 32	NP_001159586.1
	PNPLA6	NM_001166111.2		c.925C>G	p.Pro309Ala	missense	Exon 9 of 34	NP_001159583.1
	PNPLA6	NM_001166113.1		c.781C>G	p.Pro261Ala	missense	Exon 10 of 35	NP_001159585.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNPLA6	ENST00000600737.6	TSL:1 MANE Select	c.898C>G	p.Pro300Ala	missense	Exon 7 of 32	ENSP00000473211.1
	PNPLA6	ENST00000221249.10	TSL:1	c.781C>G	p.Pro261Ala	missense	Exon 10 of 35	ENSP00000221249.5
	PNPLA6	ENST00000450331.7	TSL:1	c.781C>G	p.Pro261Ala	missense	Exon 10 of 35	ENSP00000394348.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 34

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cerebellar ataxia;C0013362:Dysarthria;C0342384:Hypogonadotropic hypogonadism 7 with or without anosmia Pathogenic:1

May 19, 2014

Centre for Mendelian Genomics, University Medical Centre Ljubljana

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.64
BayesDel_addAF	Pathogenic	0.21	D
BayesDel_noAF	Uncertain	0.060
CADD	Pathogenic	33
DANN	Uncertain	1.0
Eigen	Pathogenic	0.81
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Pathogenic	0.98	D
M_CAP	Pathogenic	0.65	D
MetaRNN	Pathogenic	0.97	D
MetaSVM	Uncertain	-0.19	T
PhyloP100		7.8
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-7.4	D
REVEL	Pathogenic	0.66
Sift	Pathogenic	0.0	D
Sift4G	Uncertain	0.0040	D
Polyphen		1.0	D
Vest4		0.85
MutPred		0.82		Gain of helix (P = 0.0496)
MVP		0.70
MPC		2.3
ClinPred		1.0	D
GERP RS		5.4
Varity_R		0.78
gMVP		0.93
Mutation Taster		=18/82	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.46		Details are displayed if max score is > 0.2
DS_DG_spliceai		0.46		Position offset: -5

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1057518936; hg19: chr19-7605911;